/* +------------------------------------------------------------------------+
   |                     Mobile Robot Programming Toolkit (MRPT)            |
   |                          https://www.mrpt.org/                         |
   |                                                                        |
   | Copyright (c) 2005-2022, Individual contributors, see AUTHORS file     |
   | See: https://www.mrpt.org/Authors - All rights reserved.               |
   | Released under BSD License. See: https://www.mrpt.org/License          |
   +------------------------------------------------------------------------+ */

#include "vision-precomp.h"	 // Precompiled headers
//
#include <mrpt/io/CFileOutputStream.h>
#include <mrpt/maps/CLandmark.h>
#include <mrpt/maps/CLandmarksMap.h>
#include <mrpt/math/geometry.h>
#include <mrpt/math/ops_matrices.h>
#include <mrpt/obs/CObservation2DRangeScan.h>
#include <mrpt/obs/CObservationBeaconRanges.h>
#include <mrpt/obs/CObservationGPS.h>
#include <mrpt/obs/CObservationImage.h>
#include <mrpt/obs/CObservationRobotPose.h>
#include <mrpt/obs/CObservationStereoImages.h>
#include <mrpt/obs/CObservationVisualLandmarks.h>
#include <mrpt/opengl/CEllipsoid3D.h>
#include <mrpt/opengl/CGridPlaneXY.h>
#include <mrpt/opengl/COpenGLScene.h>
#include <mrpt/poses/CPointPDFGaussian.h>
#include <mrpt/random.h>
#include <mrpt/system/os.h>

#include <Eigen/Dense>

using namespace mrpt;
using namespace mrpt::math;
using namespace mrpt::maps;
using namespace mrpt::obs;
using namespace mrpt::poses;
using namespace mrpt::tfest;
using namespace mrpt::random;
using namespace mrpt::system;
using namespace mrpt::vision;
using namespace mrpt::img;
using namespace mrpt::containers;
using namespace std;
using mrpt::maps::internal::TSequenceLandmarks;

//  =========== Begin of Map definition ============
MAP_DEFINITION_REGISTER(
	"mrpt::maps::CLandmarksMap,landmarksMap", mrpt::maps::CLandmarksMap)

CLandmarksMap::TMapDefinition::TMapDefinition() = default;
void CLandmarksMap::TMapDefinition::loadFromConfigFile_map_specific(
	const mrpt::config::CConfigFileBase& source,
	const std::string& sectionNamePrefix)
{
	// [<sectionNamePrefix>+"_creationOpts"]
	const std::string sSectCreation =
		sectionNamePrefix + string("_creationOpts");
	this->initialBeacons.clear();
	const unsigned int nBeacons = source.read_int(sSectCreation, "nBeacons", 0);
	for (unsigned int q = 1; q <= nBeacons; q++)
	{
		TPairIdBeacon newPair;
		newPair.second =
			source.read_int(sSectCreation, format("beacon_%03u_ID", q), 0);

		newPair.first.x =
			source.read_float(sSectCreation, format("beacon_%03u_x", q), 0);
		newPair.first.y =
			source.read_float(sSectCreation, format("beacon_%03u_y", q), 0);
		newPair.first.z =
			source.read_float(sSectCreation, format("beacon_%03u_z", q), 0);

		this->initialBeacons.push_back(newPair);
	}

	insertionOpts.loadFromConfigFile(
		source, sectionNamePrefix + string("_insertOpts"));
	likelihoodOpts.loadFromConfigFile(
		source, sectionNamePrefix + string("_likelihoodOpts"));
}

void CLandmarksMap::TMapDefinition::dumpToTextStream_map_specific(
	std::ostream& out) const
{
	out << mrpt::format(
		"number of initial beacons                = %u\n",
		(int)initialBeacons.size());

	out << "      ID         (X,Y,Z)\n";
	out << "--------------------------------------------------------\n";
	for (const auto& initialBeacon : initialBeacons)
		out << mrpt::format(
			"      %03u         (%8.03f,%8.03f,%8.03f)\n", initialBeacon.second,
			initialBeacon.first.x, initialBeacon.first.y,
			initialBeacon.first.z);

	this->insertionOpts.dumpToTextStream(out);
	this->likelihoodOpts.dumpToTextStream(out);
}

mrpt::maps::CMetricMap* CLandmarksMap::internal_CreateFromMapDefinition(
	const mrpt::maps::TMetricMapInitializer& _def)
{
	const CLandmarksMap::TMapDefinition& def =
		*dynamic_cast<const CLandmarksMap::TMapDefinition*>(&_def);
	auto* obj = new CLandmarksMap();

	for (const auto& initialBeacon : def.initialBeacons)
	{
		CLandmark lm;

		lm.createOneFeature();
		lm.features[0].type = featBeacon;

		lm.features[0].keypoint.ID = initialBeacon.second;
		lm.ID = initialBeacon.second;

		lm.pose_mean = initialBeacon.first;

		lm.pose_cov_11 = lm.pose_cov_22 = lm.pose_cov_33 = lm.pose_cov_12 =
			lm.pose_cov_13 = lm.pose_cov_23 = square(0.01f);

		obj->landmarks.push_back(lm);
	}

	obj->insertionOptions = def.insertionOpts;
	obj->likelihoodOptions = def.likelihoodOpts;
	return obj;
}
//  =========== End of Map definition Block =========

IMPLEMENTS_SERIALIZABLE(CLandmarksMap, CMetricMap, mrpt::maps)

/*---------------------------------------------------------------
				Static variables initialization
  ---------------------------------------------------------------*/
std::map<
	std::pair<
		mrpt::maps::CLandmark::TLandmarkID, mrpt::maps::CLandmark::TLandmarkID>,
	double>
	CLandmarksMap::_mEDD;
mrpt::maps::CLandmark::TLandmarkID CLandmarksMap::_mapMaxID;
bool CLandmarksMap::_maxIDUpdated = false;

void CLandmarksMap::internal_clear() { landmarks.clear(); }

size_t CLandmarksMap::size() const { return landmarks.size(); }

uint8_t CLandmarksMap::serializeGetVersion() const { return 0; }
void CLandmarksMap::serializeTo(mrpt::serialization::CArchive& out) const
{
	uint32_t n = landmarks.size();

	// First, write the number of landmarks:
	out << n;

	// Write all landmarks:
	for (const auto& landmark : landmarks)
		out << landmark;
}

void CLandmarksMap::serializeFrom(
	mrpt::serialization::CArchive& in, uint8_t version)
{
	switch (version)
	{
		case 0:
		{
			uint32_t n, i;
			CLandmark lm;

			// Delete previous content of map:
			// -------------------------------------
			landmarks.clear();

			// Load from stream:
			// -------------------------------------
			in >> n;

			landmarks.clear();	// resize(n);

			// Read all landmarks:
			for (i = 0; i < n; i++)
			{
				in >> lm;
				landmarks.push_back(lm);
			}
		}
		break;
		default: MRPT_THROW_UNKNOWN_SERIALIZATION_VERSION(version);
	};
}

/*---------------------------------------------------------------
					computeObservationLikelihood
  ---------------------------------------------------------------*/
double CLandmarksMap::internal_computeObservationLikelihood(
	const CObservation& obs, const CPose3D& robotPose3D) const
{
	MRPT_START

	if (CLASS_ID(CObservation2DRangeScan) == obs.GetRuntimeClass() &&
		insertionOptions.insert_Landmarks_from_range_scans)
	{
		/********************************************************************
						OBSERVATION TYPE: CObservation2DRangeScan
			********************************************************************/
		const auto& o = dynamic_cast<const CObservation2DRangeScan&>(obs);
		CLandmarksMap auxMap;
		CPose2D sensorPose2D(robotPose3D + o.sensorPose);

		auxMap.loadOccupancyFeaturesFrom2DRangeScan(
			o, robotPose3D, likelihoodOptions.rangeScan2D_decimation);

		// And compute its likelihood:
		return computeLikelihood_RSLC_2007(&auxMap, sensorPose2D);
	}  // end of likelihood of 2D range scan:
	else if (CLASS_ID(CObservationStereoImages) == obs.GetRuntimeClass())
	{
		/********************************************************************
						OBSERVATION TYPE: CObservationStereoImages
				Lik. between "this" and "auxMap";
			********************************************************************/
		const auto& o = dynamic_cast<const CObservationStereoImages&>(obs);

		CLandmarksMap auxMap;
		auxMap.insertionOptions = insertionOptions;
		auxMap.loadSiftFeaturesFromStereoImageObservation(
			o, CLandmarksMap::_mapMaxID, likelihoodOptions.SIFT_feat_options);
		auxMap.changeCoordinatesReference(robotPose3D);

		// ACCESS TO STATIC VARIABLE
		// std::cout << "_mapMaxID, from " << CLandmarksMap::_mapMaxID << " to
		// ";
		if (!CLandmarksMap::_maxIDUpdated)
		{
			CLandmarksMap::_mapMaxID += auxMap.size();
			CLandmarksMap::_maxIDUpdated = true;
		}  // end if

		// std::cout << CLandmarksMap::_mapMaxID <<std::endl;
		return computeLikelihood_SIFT_LandmarkMap(&auxMap);

	}  // end of likelihood of Stereo Images scan:
	else if (CLASS_ID(CObservationBeaconRanges) == obs.GetRuntimeClass())
	{
		/********************************************************************

						OBSERVATION TYPE: CObservationBeaconRanges

				Lik. between "this" and "auxMap";

			********************************************************************/
		const auto& o = dynamic_cast<const CObservationBeaconRanges&>(obs);

		const double sensorStd = likelihoodOptions.beaconRangesUseObservationStd
			? o.stdError
			: likelihoodOptions.beaconRangesStd;
		ASSERT_GT_(sensorStd, .0);
		const auto unif_val =
			std::log(1.0 / (o.maxSensorDistance - o.minSensorDistance));

		CPointPDFGaussian beaconPDF;
		double ret = 0;

		for (const auto& meas : o.sensedData)
		{
			// Look for the beacon in this map:
			unsigned int sensedID = meas.beaconID;
			bool found = false;

			if (std::isnan(meas.sensedDistance)) continue;

			// Compute the 3D position of the sensor:
			const auto point3D = robotPose3D + meas.sensorLocationOnRobot;

			for (const auto& lm : landmarks)
			{
				if ((lm.getType() != featBeacon) || (lm.ID != sensedID))
					continue;  // Skip

				lm.getPose(beaconPDF);
				const auto& beacon3D = beaconPDF.mean;

				const double expectedRange = point3D.distanceTo(beacon3D);
				const double sensedDist =
					std::max<double>(.0, meas.sensedDistance);
				MRPT_CHECK_NORMAL_NUMBER(expectedRange);

				ret +=
					(-0.5 *
					 mrpt::square((expectedRange - sensedDist) / sensorStd));
				found = true;
				break;	// we found the beacon, skip the rest of landmarks
			}

			// If not found, uniform distribution:
			if (!found && o.maxSensorDistance > o.minSensorDistance)
			{
				ret += unif_val;
				MRPT_CHECK_NORMAL_NUMBER(ret);
			}

		}  // for each sensed beacon

		MRPT_CHECK_NORMAL_NUMBER(ret);
		return ret;

	}  // end of likelihood of CObservationBeaconRanges
	else if (CLASS_ID(CObservationRobotPose) == obs.GetRuntimeClass())
	{
		/********************************************************************

				OBSERVATION TYPE: CObservationRobotPose

				Lik. between "this" and "robotPose";

		********************************************************************/
		const auto& o = dynamic_cast<const CObservationRobotPose&>(obs);

		// Compute the 3D position of the sensor:
		CPose3D sensorPose3D = robotPose3D + o.sensorPose;

		// Compute the likelihood according to mahalanobis distance between
		// poses:
		CMatrixD dij(1, 6), Cij(6, 6), Cij_1;
		dij(0, 0) = o.pose.mean.x() - sensorPose3D.x();
		dij(0, 1) = o.pose.mean.y() - sensorPose3D.y();
		dij(0, 2) = o.pose.mean.z() - sensorPose3D.z();
		dij(0, 3) = wrapToPi(o.pose.mean.yaw() - sensorPose3D.yaw());
		dij(0, 4) = wrapToPi(o.pose.mean.pitch() - sensorPose3D.pitch());
		dij(0, 5) = wrapToPi(o.pose.mean.roll() - sensorPose3D.roll());

		// Equivalent covariance from "i" to "j":
		Cij = CMatrixDouble(o.pose.cov);
		Cij_1 = Cij.inverse_LLt();

		double distMahaFlik2 = mrpt::math::multiply_HCHt_scalar(dij, Cij_1);
		double ret =
			-0.5 * (distMahaFlik2 / square(likelihoodOptions.extRobotPoseStd));

		MRPT_CHECK_NORMAL_NUMBER(ret);
		return ret;

	}  // end of likelihood of CObservation
	else if (CLASS_ID(CObservationGPS) == obs.GetRuntimeClass())
	{
		/********************************************************************

						OBSERVATION TYPE: CObservationGPS

		********************************************************************/
		const auto& o = dynamic_cast<const CObservationGPS&>(obs);
		// Compute the 3D position of the sensor:
		CPoint3D point3D = CPoint3D(robotPose3D);
		CPoint3D GPSpose;
		double x, y;
		double earth_radius = 6378137;

		if ((o.has_GGA_datum()) &&
			(likelihoodOptions.GPSOrigin.min_sat <=
			 o.getMsgByClass<gnss::Message_NMEA_GGA>().fields.satellitesUsed))
		{
			// Compose GPS robot position

			x = DEG2RAD(
					(o.getMsgByClass<gnss::Message_NMEA_GGA>()
						 .fields.longitude_degrees -
					 likelihoodOptions.GPSOrigin.longitude)) *
				earth_radius * 1.03;
			y = DEG2RAD(
					(o.getMsgByClass<gnss::Message_NMEA_GGA>()
						 .fields.latitude_degrees -
					 likelihoodOptions.GPSOrigin.latitude)) *
				earth_radius * 1.15;
			GPSpose.x(
				(x * cos(likelihoodOptions.GPSOrigin.ang) +
				 y * sin(likelihoodOptions.GPSOrigin.ang) +
				 likelihoodOptions.GPSOrigin.x_shift));
			GPSpose.y(
				(-x * sin(likelihoodOptions.GPSOrigin.ang) +
				 y * cos(likelihoodOptions.GPSOrigin.ang) +
				 likelihoodOptions.GPSOrigin.y_shift));
			GPSpose.z(
				(o.getMsgByClass<gnss::Message_NMEA_GGA>()
					 .fields.altitude_meters -
				 likelihoodOptions.GPSOrigin.altitude));
			// std::cout<<"GPSpose calculo: "<<GPSpose.x<<","<<GPSpose.y<<"\n";

			//-------------------------------//
			// sigmaGPS =
			// f(o.getMsgByClass<gnss::Message_NMEA_GGA>().fields.satellitesUsed)
			// //funcion del numero de satelites
			//-------------------------------//

			// std::cout<<"datos de longitud y latitud:
			// "<<o.getMsgByClass<gnss::Message_NMEA_GGA>().fields.longitude_degrees<<","<<o.getMsgByClass<gnss::Message_NMEA_GGA>().fields.latitude_degrees<<","<<"\n";
			// std::cout<<"x,y sin rotar: "<<x<<","<<y<<","<<"\n";
			// std::cout<<"angulo: "<<likelihoodOptions.GPSOrigin.ang<<"\n";
			// std::cout<<"desp x,y:
			// "<<likelihoodOptions.GPSOrigin.x_shift<<","<<likelihoodOptions.GPSOrigin.y_shift<<"\n";
			// std::cout<<"GPS ORIGIN    :
			// "<<likelihoodOptions.GPSOrigin.longitude<<","<<likelihoodOptions.GPSOrigin.latitude<<","<<likelihoodOptions.GPSOrigin.altitude<<"\n";
			// std::cout<<"POSE DEL ROBOT:
			// "<<point3D.x<<","<<point3D.y<<","<<point3D.z<<"\n";
			// std::cout<<"POSE GPS      :
			// "<<GPSpose.x<<","<<GPSpose.y<<","<<GPSpose.z<<"\n";
			// std::cin.get();

			float distance = GPSpose.distanceTo(point3D);

			// std::cout<<"likel gps:"<<-0.5f*square( ( distance
			// )/likelihoodOptions.GPS_sigma)<<"\n";;
			double ret =
				-0.5f * square((distance) / likelihoodOptions.GPS_sigma);
			MRPT_CHECK_NORMAL_NUMBER(ret);
			return ret;
		}
		else
			return 0.5;
	}  // end of likelihood of CObservationGPS
	else
	{
		/********************************************************************

					OBSERVATION TYPE: Unknown

		********************************************************************/
		return 0.5;
	}

	MRPT_END
}

/*---------------------------------------------------------------
						insertObservation
  ---------------------------------------------------------------*/
bool CLandmarksMap::internal_insertObservation(
	const CObservation& obs,
	const std::optional<const mrpt::poses::CPose3D>& robotPose)
{
	MRPT_START

	CPose2D robotPose2D;
	CPose3D robotPose3D;

	if (robotPose)
	{
		robotPose2D = CPose2D(*robotPose);
		robotPose3D = (*robotPose);
	}
	else
	{
		// Default values are (0,0,0)
	}

	if (CLASS_ID(CObservationImage) == obs.GetRuntimeClass() &&
		insertionOptions.insert_SIFTs_from_monocular_images)
	{
		/********************************************************************

						OBSERVATION TYPE: CObservationImage

			********************************************************************/
		const auto& o = dynamic_cast<const CObservationImage&>(obs);
		CLandmarksMap tempMap;

		// 1) Load the features in a temporary 3D landmarks map:
		tempMap.loadSiftFeaturesFromImageObservation(
			o, insertionOptions.SIFT_feat_options);

		// 2) This temp. map must be moved to its real position on the global
		// reference coordinates:
		tempMap.changeCoordinatesReference(robotPose3D);

		// 3) Fuse that map with the current contents of "this" one:
		fuseWith(tempMap);

		// DONE!!

		// Observation was successfully inserted into the map
		// --------------------------------------------------------
		return true;
	}
	//	else
	//	if ( CLASS_ID(CObservation2DRangeScan)==obs.GetRuntimeClass() &&
	//		  insertionOptions.insert_Landmarks_from_range_scans)
	//	{
	/********************************************************************

					OBSERVATION TYPE: CObservation2DRangeScan

		********************************************************************/
	/*		CObservation2DRangeScan	*o = (CObservation2DRangeScan*) obs;
			CLandmarksMap			tempMap;

			// Load into the map:
			tempMap.loadOccupancyFeaturesFrom2DRangeScan(*o, robotPose);
			fuseWith( tempMap );

			// Observation was successfully inserted into the map
			// --------------------------------------------------------
			return true;
		}       				*/
	else if (
		CLASS_ID(CObservationStereoImages) == obs.GetRuntimeClass() &&
		insertionOptions.insert_SIFTs_from_stereo_images)
	{
		/********************************************************************
						OBSERVATION TYPE: CObservationStereoImages
			********************************************************************/
		const auto& o = dynamic_cast<const CObservationStereoImages&>(obs);

		// Change coordinates ref:
		CLandmarksMap auxMap;
		auxMap.insertionOptions = insertionOptions;
		auxMap.loadSiftFeaturesFromStereoImageObservation(
			o, CLandmarksMap::_mapMaxID, insertionOptions.SIFT_feat_options);
		auxMap.changeCoordinatesReference(robotPose3D);

		fuseWith(auxMap);

		// Observation was successfully inserted into the map
		// --------------------------------------------------------
		return true;
	}
	else if (CLASS_ID(CObservationVisualLandmarks) == obs.GetRuntimeClass())
	{
		/********************************************************************

						OBSERVATION TYPE:  CObservationVisualLandmarks

			********************************************************************/
		const auto& o = dynamic_cast<const CObservationVisualLandmarks&>(obs);

		// Change coordinates ref:
		CLandmarksMap auxMap;
		CPose3D acumTransform(robotPose3D + o.refCameraPose);
		auxMap.changeCoordinatesReference(acumTransform, &o.landmarks);

		// Fuse with current:
		fuseWith(auxMap, true);

		// Observation was successfully inserted into the map
		// --------------------------------------------------------
		return true;
	}
	else
	{
		/********************************************************************
					OBSERVATION TYPE: Unknown
		********************************************************************/
		return false;
	}

	MRPT_END
}

/*---------------------------------------------------------------
				computeMatchingWith2D
  ---------------------------------------------------------------*/
void CLandmarksMap::computeMatchingWith2D(
	[[maybe_unused]] const mrpt::maps::CMetricMap* otherMap,
	[[maybe_unused]] const CPose2D& otherMapPose,
	[[maybe_unused]] float maxDistForCorrespondence,
	[[maybe_unused]] float maxAngularDistForCorrespondence,
	[[maybe_unused]] const CPose2D& angularDistPivotPoint,
	[[maybe_unused]] TMatchingPairList& correspondences,
	[[maybe_unused]] float& correspondencesRatio,
	[[maybe_unused]] float* sumSqrDist,
	[[maybe_unused]] bool onlyKeepTheClosest,
	[[maybe_unused]] bool onlyUniqueRobust) const
{
	MRPT_START

	CLandmarksMap auxMap;
	CPose3D otherMapPose3D(otherMapPose);

	correspondencesRatio = 0;

	// Check the other map class:
	ASSERT_(otherMap->GetRuntimeClass() == CLASS_ID(CLandmarksMap));
	const auto* otherMap2 = dynamic_cast<const CLandmarksMap*>(otherMap);
	std::vector<bool> otherCorrespondences;

	// Coordinates change:
	auxMap.changeCoordinatesReference(otherMapPose3D, otherMap2);

	//// Use the 3D matching method:
	computeMatchingWith3DLandmarks(
		otherMap2, correspondences, correspondencesRatio, otherCorrespondences);

	MRPT_END
}

/*---------------------------------------------------------------
				loadSiftFeaturesFromImageObservation
  ---------------------------------------------------------------*/
void CLandmarksMap::loadSiftFeaturesFromImageObservation(
	const CObservationImage& obs,
	const mrpt::vision::CFeatureExtraction::TOptions& feat_options)
{
	CImage corImg;
	CPointPDFGaussian landmark3DPositionPDF;
	float d = insertionOptions.SIFTsLoadDistanceOfTheMean;
	float width = insertionOptions.SIFTsLoadEllipsoidWidth;
	CMatrixDouble33 P, D;
	CLandmark lm;

	vision::CFeatureExtraction fExt;
	vision::CFeatureList siftList;	// vision::TSIFTFeatureList siftList;
	vision::CFeatureList::iterator
		sift;  // vision::TSIFTFeatureList::iterator	sift;

	// Timestamp:
	lm.timestampLastSeen = obs.timestamp;
	lm.seenTimesCount = 1;

	// Remove distortion:
	corImg =
		obs.image;	// obs.image.correctDistortion(obs.intrinsicParams,obs.distortionParams);

	// Extract SIFT features:
	fExt.options = feat_options;
	fExt.detectFeatures(
		corImg, siftList);	// vision::computeSiftFeatures(corImg, siftList );

	// Save them as 3D landmarks:
	landmarks.clear();	// resize( siftList.size() );

	for (sift = siftList.begin(); sift != siftList.end(); sift++)
	{
		// Find the 3D position from the pixels
		//  coordinates and the camera intrinsic matrix:
		mrpt::math::TPoint3D dir = vision::pixelTo3D(
			sift->keypoint.pt, obs.cameraParams.intrinsicParams);

		// Compute the mean and covariance of the landmark gaussian 3D position,
		//  from the unitary direction vector and a given distance:
		// --------------------------------------------------------------------------
		landmark3DPositionPDF.mean = CPoint3D(dir);	 // The mean is easy :-)
		landmark3DPositionPDF.mean *= d;

		// The covariance:
		P = math::generateAxisBaseFromDirection(dir.x, dir.y, dir.z);

		// Diagonal matrix (with the "size" of the ellipsoid)
		D(0, 0) = square(0.5 * d);
		D(1, 1) = square(width);
		D(2, 2) = square(width);

		// Finally, compute the covariance!
		landmark3DPositionPDF.cov = mrpt::math::multiply_HCHt(P, D);

		// Save into the landmarks vector:
		// --------------------------------------------
		lm.features.resize(1);
		lm.features[0] = (*sift);

		CPoint3D Normal = landmark3DPositionPDF.mean;
		Normal *= -1 / Normal.norm();

		lm.normal = Normal.asTPoint();

		lm.pose_mean = landmark3DPositionPDF.mean.asTPoint();

		lm.pose_cov_11 = landmark3DPositionPDF.cov(0, 0);
		lm.pose_cov_22 = landmark3DPositionPDF.cov(1, 1);
		lm.pose_cov_33 = landmark3DPositionPDF.cov(2, 2);
		lm.pose_cov_12 = landmark3DPositionPDF.cov(0, 1);
		lm.pose_cov_13 = landmark3DPositionPDF.cov(0, 2);
		lm.pose_cov_23 = landmark3DPositionPDF.cov(1, 2);

		landmarks.push_back(lm);
	}

}  // end loadSiftFeaturesFromImageObservation

/*---------------------------------------------------------------
				loadSiftFeaturesFromStereoImagesObservation
  ---------------------------------------------------------------*/
void CLandmarksMap::loadSiftFeaturesFromStereoImageObservation(
	const CObservationStereoImages& obs, mrpt::maps::CLandmark::TLandmarkID fID,
	const mrpt::vision::CFeatureExtraction::TOptions& feat_options)
{
	MRPT_START

	vision::CFeatureExtraction fExt;
	vision::CFeatureList leftSiftList, rightSiftList;
	vision::CMatchedFeatureList matchesList;
	vision::TMatchingOptions matchingOptions;
	vision::TStereoSystemParams stereoParams;

	CLandmarksMap landmarkMap;

	// Extract SIFT features:
	fExt.options = feat_options;

	// Default: Hess implementation
	fExt.detectFeatures(
		obs.imageLeft, leftSiftList, fID,
		insertionOptions.SIFTs_numberOfKLTKeypoints);
	fExt.detectFeatures(
		obs.imageRight, rightSiftList, fID,
		insertionOptions.SIFTs_numberOfKLTKeypoints);

	matchingOptions.matching_method =
		vision::TMatchingOptions::mmDescriptorSIFT;
	matchingOptions.epipolar_TH = insertionOptions.SIFTs_epipolar_TH;
	matchingOptions.EDD_RATIO = insertionOptions.SiftCorrRatioThreshold;
	matchingOptions.maxEDD_TH = insertionOptions.SiftEDDThreshold;
	vision::matchFeatures(
		leftSiftList, rightSiftList, matchesList, matchingOptions);

	if (insertionOptions.PLOT_IMAGES)
	{
		std::cerr << "Warning: insertionOptions.PLOT_IMAGES has no effect "
					 "since MRPT 0.9.1\n";
	}

	// obs.imageLeft.saveToFile("LImage.jpg");
	// obs.imageRight.saveToFile("RImage.jpg");
	// FILE *fmt;
	// fmt = os::fopen( "matchesRBPF.txt", "at" );
	// os::fprintf( fmt, "%d\n", (unsigned int)matchesList.size() );
	// os::fclose(fmt);
	// matchesList.saveToTextFile("matches.txt");

	// Feature Projection to 3D
	// Parameters of the stereo rig

	stereoParams.K = obs.leftCamera.intrinsicParams;
	stereoParams.stdPixel = insertionOptions.SIFTs_stdXY;
	stereoParams.stdDisp = insertionOptions.SIFTs_stdDisparity;
	stereoParams.baseline = obs.rightCameraPose.x();
	stereoParams.minZ = 0.0f;
	stereoParams.maxZ = insertionOptions.SIFTs_stereo_maxDepth;

	size_t numM = matchesList.size();
	vision::projectMatchedFeatures(matchesList, stereoParams, *this);

	// Add Timestamp and the "Seen-Times" counter
	TCustomSequenceLandmarks::iterator ii;
	for (ii = landmarks.begin(); ii != landmarks.end(); ii++)
	{
		(*ii).timestampLastSeen = obs.timestamp;
		(*ii).seenTimesCount = 1;
	}

	printf(
		"%u (out of %u) corrs!\n", static_cast<unsigned>(landmarks.size()),
		static_cast<unsigned>(numM));

	// CLandmarksMap::_maxMapID = fID;

	// Project landmarks according to the ref. camera pose:
	changeCoordinatesReference(mrpt::poses::CPose3D(obs.cameraPose));

	MRPT_END
}

/*---------------------------------------------------------------
				changeCoordinatesReference
  ---------------------------------------------------------------*/
void CLandmarksMap::changeCoordinatesReference(const CPose3D& newOrg)
{
	TSequenceLandmarks::iterator lm;

	CMatrixDouble44 HM;
	newOrg.getHomogeneousMatrix(HM);

	// Build the rotation only transformation:
	double R11 = HM(0, 0);
	double R12 = HM(0, 1);
	double R13 = HM(0, 2);
	double R21 = HM(1, 0);
	double R22 = HM(1, 1);
	double R23 = HM(1, 2);
	double R31 = HM(2, 0);
	double R32 = HM(2, 1);
	double R33 = HM(2, 2);

	double c11, c22, c33, c12, c13, c23;

	// Change the reference of each individual landmark:
	// ----------------------------------------------------
	for (lm = landmarks.begin(); lm != landmarks.end(); lm++)
	{
		// Transform the pose mean & covariance:
		// ---------------------------------------------------------
		newOrg.composePoint(lm->pose_mean, lm->pose_mean);

		float C11 = lm->pose_cov_11;
		float C22 = lm->pose_cov_22;
		float C33 = lm->pose_cov_33;
		float C12 = lm->pose_cov_12;
		float C13 = lm->pose_cov_13;
		float C23 = lm->pose_cov_23;

		// The covariance:  cov = M * cov * (~M);
		c11 = R11 * (C11 * R11 + C12 * R12 + C13 * R13) +
			R12 * (C12 * R11 + C22 * R12 + C23 * R13) +
			R13 * (C13 * R11 + C23 * R12 + C33 * R13);
		c12 = (C11 * R11 + C12 * R12 + C13 * R13) * R21 +
			(C12 * R11 + C22 * R12 + C23 * R13) * R22 +
			(C13 * R11 + C23 * R12 + C33 * R13) * R23;
		c13 = (C11 * R11 + C12 * R12 + C13 * R13) * R31 +
			(C12 * R11 + C22 * R12 + C23 * R13) * R32 +
			(C13 * R11 + C23 * R12 + C33 * R13) * R33;
		c22 = R21 * (C11 * R21 + C12 * R22 + C13 * R23) +
			R22 * (C12 * R21 + C22 * R22 + C23 * R23) +
			R23 * (C13 * R21 + C23 * R22 + C33 * R23);
		c23 = (C11 * R21 + C12 * R22 + C13 * R23) * R31 +
			(C12 * R21 + C22 * R22 + C23 * R23) * R32 +
			(C13 * R21 + C23 * R22 + C33 * R23) * R33;
		c33 = R31 * (C11 * R31 + C12 * R32 + C13 * R33) +
			R32 * (C12 * R31 + C22 * R32 + C23 * R33) +
			R33 * (C13 * R31 + C23 * R32 + C33 * R33);

		// save into the landmark:
		lm->pose_cov_11 = c11;
		lm->pose_cov_22 = c22;
		lm->pose_cov_33 = c33;
		lm->pose_cov_12 = c12;
		lm->pose_cov_13 = c13;
		lm->pose_cov_23 = c23;

		// Rotate the normal:         lm->normal = rot + lm->normal;
		// ---------------------------------------------------------
		float Nx = lm->normal.x;
		float Ny = lm->normal.y;
		float Nz = lm->normal.z;

		lm->normal.x = Nx * R11 + Ny * R12 + Nz * R13;
		lm->normal.y = Nx * R21 + Ny * R22 + Nz * R23;
		lm->normal.z = Nx * R31 + Ny * R32 + Nz * R33;
	}

	// For updating the KD-Tree
	landmarks.hasBeenModifiedAll();
}

/*---------------------------------------------------------------
				changeCoordinatesReference
  ---------------------------------------------------------------*/
void CLandmarksMap::changeCoordinatesReference(
	const CPose3D& newOrg, const mrpt::maps::CLandmarksMap* otherMap)
{
	TSequenceLandmarks::const_iterator lm;
	CLandmark newLandmark;

	CMatrixDouble44 HM;
	newOrg.getHomogeneousMatrix(HM);

	// Build the rotation only transformation:
	double R11 = HM(0, 0);
	double R12 = HM(0, 1);
	double R13 = HM(0, 2);
	double R21 = HM(1, 0);
	double R22 = HM(1, 1);
	double R23 = HM(1, 2);
	double R31 = HM(2, 0);
	double R32 = HM(2, 1);
	double R33 = HM(2, 2);

	double c11, c22, c33, c12, c13, c23;

	landmarks.clear();

	// Change the reference of each individual landmark:
	// ----------------------------------------------------
	for (lm = otherMap->landmarks.begin(); lm != otherMap->landmarks.end();
		 lm++)
	{
		// Transform the pose mean & covariance:
		// ---------------------------------------------------------
		// The mean:     mean = newReferenceBase + mean;
		newOrg.composePoint(lm->pose_mean, newLandmark.pose_mean);

		float C11 = lm->pose_cov_11;
		float C22 = lm->pose_cov_22;
		float C33 = lm->pose_cov_33;
		float C12 = lm->pose_cov_12;
		float C13 = lm->pose_cov_13;
		float C23 = lm->pose_cov_23;

		// The covariance:  cov = M * cov * (~M);
		c11 = R11 * (C11 * R11 + C12 * R12 + C13 * R13) +
			R12 * (C12 * R11 + C22 * R12 + C23 * R13) +
			R13 * (C13 * R11 + C23 * R12 + C33 * R13);
		c12 = (C11 * R11 + C12 * R12 + C13 * R13) * R21 +
			(C12 * R11 + C22 * R12 + C23 * R13) * R22 +
			(C13 * R11 + C23 * R12 + C33 * R13) * R23;
		c13 = (C11 * R11 + C12 * R12 + C13 * R13) * R31 +
			(C12 * R11 + C22 * R12 + C23 * R13) * R32 +
			(C13 * R11 + C23 * R12 + C33 * R13) * R33;
		c22 = R21 * (C11 * R21 + C12 * R22 + C13 * R23) +
			R22 * (C12 * R21 + C22 * R22 + C23 * R23) +
			R23 * (C13 * R21 + C23 * R22 + C33 * R23);
		c23 = (C11 * R21 + C12 * R22 + C13 * R23) * R31 +
			(C12 * R21 + C22 * R22 + C23 * R23) * R32 +
			(C13 * R21 + C23 * R22 + C33 * R23) * R33;
		c33 = R31 * (C11 * R31 + C12 * R32 + C13 * R33) +
			R32 * (C12 * R31 + C22 * R32 + C23 * R33) +
			R33 * (C13 * R31 + C23 * R32 + C33 * R33);

		// save into the landmark:
		newLandmark.pose_cov_11 = c11;
		newLandmark.pose_cov_22 = c22;
		newLandmark.pose_cov_33 = c33;
		newLandmark.pose_cov_12 = c12;
		newLandmark.pose_cov_13 = c13;
		newLandmark.pose_cov_23 = c23;

		// Rotate the normal:         lm->normal = rot + lm->normal;
		// ---------------------------------------------------------
		float Nx = lm->normal.x;
		float Ny = lm->normal.y;
		float Nz = lm->normal.z;

		newLandmark.normal.x = Nx * R11 + Ny * R12 + Nz * R13;
		newLandmark.normal.y = Nx * R21 + Ny * R22 + Nz * R23;
		newLandmark.normal.z = Nx * R31 + Ny * R32 + Nz * R33;

		newLandmark.ID = lm->ID;

		newLandmark.features = lm->features;

		newLandmark.timestampLastSeen = lm->timestampLastSeen;
		newLandmark.seenTimesCount = lm->seenTimesCount;

		landmarks.push_back(newLandmark);
	}
}

/*---------------------------------------------------------------
						fuseWith
  ---------------------------------------------------------------*/
void CLandmarksMap::fuseWith(CLandmarksMap& other, bool justInsertAllOfThem)
{
	MRPT_START

	// std::cout << "Entrando en fuseWith" << std::endl;

	std::vector<bool> otherCorrs(other.size(), false);
	TMatchingPairList corrs;
	TMatchingPairList::iterator corrIt;
	float corrsRatio;
	CLandmark *thisLM, *otherLM;
	int i, n;
	bool verbose = true;  // false;
	TTimeStamp lastestTime;
	unsigned int nRemoved = 0;

	if (!justInsertAllOfThem)
	{
		// 1) Compute matching between the global and the new map:
		// ---------------------------------------------------------
		computeMatchingWith3DLandmarks(&other, corrs, corrsRatio, otherCorrs);

		// 2) Fuse correspondences
		// ---------------------------------------------------------
		for (corrIt = corrs.begin(); corrIt != corrs.end(); corrIt++)
		{
			thisLM = landmarks.get(corrIt->globalIdx);
			otherLM = other.landmarks.get(corrIt->localIdx);

			// Fuse their poses:
			CPointPDFGaussian P, P1, P2;

			thisLM->getPose(P1);
			otherLM->getPose(P2);

			P.bayesianFusion(P1, P2);

			landmarks.isToBeModified(corrIt->globalIdx);
			thisLM->setPose(P);

			// Update "seen" data:
			thisLM->seenTimesCount++;
			thisLM->timestampLastSeen = otherLM->timestampLastSeen;

			landmarks.hasBeenModified(corrIt->globalIdx);

		}  // end foreach corrs
	}

	// 3) Add new landmarks from the other map:
	// ---------------------------------------------------------
	n = other.size();
	for (i = 0; i < n; i++)
	{
		// Find the lastest time.
		lastestTime =
			max(lastestTime, other.landmarks.get(i)->timestampLastSeen);

		if (!otherCorrs[i])
		{
			// No corrs: A NEW LANDMARK!
			landmarks.push_back(*other.landmarks.get(i));
		}
	}  // end foreach other landmark

	if (!justInsertAllOfThem)
	{
		// 4) Remove landmarks that have been not seen the required
		//      number of times:
		// ---------------------------------------------------------
		n = landmarks.size();
		for (i = n - 1; i >= 0; i--)
		{
			if (landmarks.get(i)->getType() !=
				featNotDefined)	 // Occupancy features
			{
				const double dt = 1e-3 *
					std::chrono::duration_cast<std::chrono::milliseconds>(
						lastestTime - landmarks.get(i)->timestampLastSeen)
						.count();
				if (dt > fuseOptions.ellapsedTime &&
					landmarks.get(i)->seenTimesCount < fuseOptions.minTimesSeen)
				{
					landmarks.erase(i);
					nRemoved++;
				}
			}
		}
	}

	if (verbose)
	{
		printf(
			"[CLandmarksMap::fuseWith] %u fused/ %u new/ %u removed -> %u "
			"total\n",
			static_cast<unsigned int>(corrs.size()),
			static_cast<unsigned int>(other.size() - corrs.size()),
			static_cast<unsigned int>(nRemoved),
			static_cast<unsigned int>(landmarks.size()));
		FILE* f = os::fopen("Fused.txt", "at");
		fprintf(
			f, "%u\t%u\t%u\t%u\n", static_cast<unsigned int>(corrs.size()),
			static_cast<unsigned int>(other.size() - corrs.size()),
			static_cast<unsigned int>(nRemoved),
			static_cast<unsigned int>(landmarks.size()));
		os::fclose(f);
	}

	MRPT_END
}

/*---------------------------------------------------------------
						computeMatchingWith3DLandmarks
  ---------------------------------------------------------------*/
void CLandmarksMap::computeMatchingWith3DLandmarks(
	const mrpt::maps::CLandmarksMap* anotherMap,
	TMatchingPairList& correspondences, float& correspondencesRatio,
	std::vector<bool>& otherCorrespondences) const
{
	MRPT_START

	TSequenceLandmarks::const_iterator thisIt, otherIt;
	unsigned int nThis, nOther;
	int maxIdx;
	float desc;
	unsigned int i, n, j, k;
	TMatchingPair match;
	double lik_dist, lik_desc, lik, maxLik;
	// double									maxLikDist = -1, maxLikDesc =
	// -1;
	CPointPDFGaussian pointPDF_k, pointPDF_j;
	std::vector<bool> thisLandmarkAssigned;
	double K_desc = 0.0;
	double K_dist = 0.0;

	//	FILE									*f = os::fopen( "flik.txt", "wt"
	//);

	// Get the number of landmarks:
	nThis = landmarks.size();
	nOther = anotherMap->landmarks.size();

	// Initially no LM has a correspondence:
	thisLandmarkAssigned.resize(nThis, false);

	// Initially, set all landmarks without correspondences:
	correspondences.clear();
	otherCorrespondences.clear();
	otherCorrespondences.resize(nOther, false);
	correspondencesRatio = 0;

	// Method selection:
	// 0. Our Method.
	// 1. Sim, Elinas, Griffin, Little.

	switch (insertionOptions.SIFTMatching3DMethod)
	{
		case 0:
			// Our method: Filter out by the likelihood of the 3D position and
			// compute the likelihood of the Euclidean descriptor distance

			// "Constants" for the distance computation
			K_desc =
				-0.5 / square(likelihoodOptions.SIFTs_sigma_descriptor_dist);
			K_dist = -0.5 / square(likelihoodOptions.SIFTs_mahaDist_std);

			// CDynamicGrid<std::vector<int32_t>>		*gridLandmarks =
			// landmarks.getGrid();
			// std::vector<int32_t>						closeLandmarksList;

			for (k = 0, otherIt = anotherMap->landmarks.begin();
				 otherIt != anotherMap->landmarks.end(); otherIt++, k++)
			{
				// Load into "pointPDF_k" the PDF of landmark "otherIt":
				otherIt->getPose(pointPDF_k);

				if (otherIt->getType() == featSIFT)
				{
					// minDist = minDist2 = 1e10f;
					maxLik = -1;
					maxIdx = -1;

					for (j = 0, thisIt = landmarks.begin();
						 thisIt != landmarks.end(); thisIt++, j++)
					{
						if (thisIt->getType() == featSIFT &&
							thisIt->features.size() ==
								otherIt->features.size() &&
							!thisIt->features.empty() &&
							thisIt->features[0].descriptors.SIFT->size() ==
								otherIt->features[0].descriptors.SIFT->size())
						{
							// Compute "coincidence probability":
							// --------------------------------------
							// Load into "pointPDF_j" the PDF of landmark
							// "otherIt":
							thisIt->getPose(pointPDF_j);

							// Compute lik:
							// lik_dist =
							// pointPDF_k.productIntegralNormalizedWith(
							// &pointPDF_j );
							CMatrixDouble dij(1, 3), Cij(3, 3), Cij_1;
							double distMahaFlik2;

							// Distance between means:
							dij(0, 0) =
								pointPDF_k.mean.x() - pointPDF_j.mean.x();
							dij(0, 1) =
								pointPDF_k.mean.y() - pointPDF_j.mean.y();
							dij(0, 2) =
								pointPDF_k.mean.z() - pointPDF_j.mean.z();

							// Equivalent covariance from "i" to "j":
							Cij =
								CMatrixDouble(pointPDF_k.cov + pointPDF_j.cov);
							Cij_1 = Cij.inverse_LLt();

							distMahaFlik2 =
								mrpt::math::multiply_HCHt_scalar(dij, Cij_1);

							lik_dist = exp(K_dist * distMahaFlik2);
							// Likelihood regarding the spatial distance

							if (lik_dist > 1e-2)
							{
								// Compute distance between descriptors:
								// --------------------------------------

								// MODIFICATION 19-SEPT-2007
								// ONLY COMPUTE THE EUCLIDEAN DISTANCE BETWEEN
								// DESCRIPTORS IF IT HAS NOT BEEN COMPUTED
								// BEFORE
								// Make the pair of points
								std::pair<
									mrpt::maps::CLandmark::TLandmarkID,
									mrpt::maps::CLandmark::TLandmarkID>
									mPair(thisIt->ID, otherIt->ID);

								if (CLandmarksMap::_mEDD[mPair] == 0)
								{
									n = otherIt->features[0]
											.descriptors.SIFT->size();
									desc = 0;
									for (i = 0; i < n; i++)
										desc += square(
											(*otherIt->features[0]
												  .descriptors.SIFT)[i] -
											(*thisIt->features[0]
												  .descriptors.SIFT)[i]);

									CLandmarksMap::_mEDD[mPair] = desc;
								}  // end if
								else
								{
									desc = CLandmarksMap::_mEDD[mPair];
								}

								lik_desc = exp(K_desc * desc);	// Likelihood
								// regarding the
								// descriptor
							}
							else
							{
								lik_desc = 1e-3;
							}

							// Likelihood of the correspondence
							// --------------------------------------
							lik = lik_dist * lik_desc;

							//						os::fprintf( f,
							//"%i\t%i\t%f\t%f\t%f\n", k, j, lik_desc, lik_dist,
							// lik );

							if (lik > maxLik)
							{
								//							maxLikDist =
								// lik_dist;
								//							maxLikDesc =
								// lik_desc;
								maxLik = lik;
								maxIdx = j;
							}

						}  // end of this landmark is SIFT

					}  // End of for each "this", j
					// os::fprintf(f, "%i\t%i\t%f\t%f\t%f\n", maxIdx, k,
					// maxLikDist, maxLikDesc, maxLik);

					// Is it a correspondence?
					if (maxLik > insertionOptions.SiftLikelihoodThreshold)
					{
						// If a previous correspondence for this LM was found,
						// discard this one!
						if (!thisLandmarkAssigned[maxIdx])
						{
							thisLandmarkAssigned[maxIdx] = true;

							// OK: A correspondence found!!
							otherCorrespondences[k] = true;

							match.globalIdx = maxIdx;
							match.global.x = landmarks.get(maxIdx)->pose_mean.x;
							match.global.y = landmarks.get(maxIdx)->pose_mean.y;
							match.global.z = landmarks.get(maxIdx)->pose_mean.z;

							match.localIdx = k;
							match.local.x =
								anotherMap->landmarks.get(k)->pose_mean.x;
							match.local.y =
								anotherMap->landmarks.get(k)->pose_mean.y;
							match.local.z =
								anotherMap->landmarks.get(k)->pose_mean.z;

							correspondences.push_back(match);
						}
					}

				}  // end of "otherIt" is SIFT

			}  // end of other it., k

			// Compute the corrs ratio:
			correspondencesRatio = correspondences.size() / d2f(nOther);
			//		os::fclose(f);

			break;

		case 1:

			// IMPLEMENTATION OF THE METHOD DESCRIBED IN [VISION-BASED SLAM
			// USING THE RBPF][SIM, ELINAS, GRIFFIN, LITTLE]
			// 1. Compute Euclidean descriptor distance (EDD).
			// 2. Matching based on a Threshold.
			// 3. Compute likelihood based only on the position of the 3D
			// landmarks.

			// 1.- COMPUTE EDD

			ASSERT_(!anotherMap->landmarks.begin()->features.empty());
			ASSERT_(!landmarks.begin()->features.empty());
			unsigned int dLen = anotherMap->landmarks.begin()
									->features[0]
									.descriptors.SIFT->size();
			for (k = 0, otherIt = anotherMap->landmarks.begin();
				 otherIt != anotherMap->landmarks.end(); otherIt++, k++)
			{
				double mEDD = -1.0;
				unsigned int mEDDidx = 0;
				for (j = 0, thisIt = landmarks.begin();
					 thisIt != landmarks.end(); thisIt++, j++)
				{
					// Compute EDD
					double EDD = 0.0;
					for (i = 0; i < dLen; i++)
						EDD += square(
							(*otherIt->features[0].descriptors.SIFT)[i] -
							(*thisIt->features[0].descriptors.SIFT)[i]);

					EDD = sqrt(EDD);

					if (EDD > mEDD)
					{
						mEDD = EDD;
						mEDDidx = j;
					}  // end if
				}  // end for j

				if (mEDD > insertionOptions.SiftEDDThreshold)
				{
					// There is a correspondence
					if (!thisLandmarkAssigned[mEDDidx])	 // If there is not
					// multiple
					// correspondence
					{
						thisLandmarkAssigned[mEDDidx] = true;

						// OK: A correspondence found!!
						otherCorrespondences[k] = true;

						otherIt->getPose(pointPDF_k);
						thisIt->getPose(pointPDF_j);

						match.globalIdx = j;
						match.global.x = landmarks.get(mEDDidx)->pose_mean.x;
						match.global.y = landmarks.get(mEDDidx)->pose_mean.y;
						match.global.z = landmarks.get(mEDDidx)->pose_mean.z;

						match.localIdx = k;
						match.local.x =
							anotherMap->landmarks.get(k)->pose_mean.x;
						match.local.y =
							anotherMap->landmarks.get(k)->pose_mean.y;
						match.local.z =
							anotherMap->landmarks.get(k)->pose_mean.z;

						correspondences.push_back(match);

					}  // end if multiple correspondence

				}  // end if mEDD

			}  // end for k

			correspondencesRatio = correspondences.size() / d2f(nOther);

			break;

	}  // end switch

	MRPT_END
}

/*---------------------------------------------------------------
						saveToTextFile
  ---------------------------------------------------------------*/
bool CLandmarksMap::saveToTextFile(std::string file)
{
	MRPT_START

	FILE* f = os::fopen(file.c_str(), "wt");
	if (!f) return false;

	// os::fprintf(f,"%% Map of landmarks - file dumped by
	// mrpt::maps::CLandmarksMap\n");
	// os::fprintf(f,"%%  Columns are: X Y Z TYPE(TKeyPointMethod) TIMES_SEEN
	// TIME_OF_LAST_OBSERVATION [SIFT DESCRIPTOR] ID\n");
	// os::fprintf(f,"%%
	// -----------------------------------------------------------------------------------------------------\n");

	for (auto it = landmarks.begin(); it != landmarks.end(); ++it)
	{
		os::fprintf(
			f, "%10f %10f %10f %4i %4u %10f", it->pose_mean.x, it->pose_mean.y,
			it->pose_mean.z, static_cast<int>(it->getType()),
			it->seenTimesCount,
			it->timestampLastSeen == INVALID_TIMESTAMP
				? 0
				: mrpt::system::extractDayTimeFromTimestamp(
					  it->timestampLastSeen));

		if (it->getType() == featSIFT)
		{
			ASSERT_(!it->features.empty());
			for (unsigned char i : *it->features[0].descriptors.SIFT)
				os::fprintf(f, " %u ", i);
		}
		os::fprintf(f, " %i ", (int)it->ID);

		os::fprintf(f, "\n");
	}

	os::fclose(f);

	return true;

	MRPT_END
}

/*---------------------------------------------------------------
						saveToMATLABScript3D
  ---------------------------------------------------------------*/
bool CLandmarksMap::saveToMATLABScript3D(
	std::string file, const char* style, float confInterval) const
{
	FILE* f = os::fopen(file.c_str(), "wt");
	if (!f) return false;

	// Header:
	os::fprintf(
		f, "%%-------------------------------------------------------\n");
	os::fprintf(f, "%% File automatically generated using the MRPT method:\n");
	os::fprintf(f, "%%   'CLandmarksMap::saveToMATLABScript3D'\n");
	os::fprintf(f, "%%\n");
	os::fprintf(f, "%%                        ~ MRPT ~\n");
	os::fprintf(
		f, "%%  Jose Luis Blanco Claraco, University of Malaga @ 2006\n");
	os::fprintf(f, "%%  http://www.isa.uma.es/ \n");
	os::fprintf(
		f, "%%-------------------------------------------------------\n\n");

	// Main code:
	os::fprintf(f, "hold on;\n\n");

	for (const auto& landmark : landmarks)
	{
		os::fprintf(
			f, "m=[%.4f %.4f %.4f];", landmark.pose_mean.x,
			landmark.pose_mean.y, landmark.pose_mean.z);
		os::fprintf(
			f, "c=[%.8f %.8f %.8f;%.8f %.8f %.8f;%.8f %.8f %.8f]; ",
			landmark.pose_cov_11, landmark.pose_cov_12, landmark.pose_cov_13,
			landmark.pose_cov_12, landmark.pose_cov_22, landmark.pose_cov_23,
			landmark.pose_cov_13, landmark.pose_cov_23, landmark.pose_cov_33);

		os::fprintf(
			f,
			"error_ellipse(c,m,'conf',%f,'style','%s','numPointsEllipse',10);"
			"\n",
			confInterval, style);
	}

	os::fprintf(f, "axis equal;grid on;xlabel('x'); ylabel('y'); zlabel('z');");

	os::fclose(f);
	return true;
}
/**/

/*---------------------------------------------------------------
						saveToMATLABScript2D
  ---------------------------------------------------------------*/
bool CLandmarksMap::saveToMATLABScript2D(
	std::string file, const char* style, float stdCount)
{
	FILE* f = os::fopen(file.c_str(), "wt");
	if (!f) return false;

	const int ELLIPSE_POINTS = 30;
	std::vector<float> X, Y, COS, SIN;
	std::vector<float>::iterator x, y, Cos, Sin;
	double ang;
	CMatrixDouble22 cov, eigVal, eigVec, M;

	X.resize(ELLIPSE_POINTS);
	Y.resize(ELLIPSE_POINTS);
	COS.resize(ELLIPSE_POINTS);
	SIN.resize(ELLIPSE_POINTS);

	// Fill the angles:
	for (Cos = COS.begin(), Sin = SIN.begin(), ang = 0; Cos != COS.end();
		 Cos++, Sin++, ang += (M_2PI / (ELLIPSE_POINTS - 1)))
	{
		*Cos = cos(ang);
		*Sin = sin(ang);
	}

	// Header:
	os::fprintf(
		f, "%%-------------------------------------------------------\n");
	os::fprintf(f, "%% File automatically generated using the MRPT method:\n");
	os::fprintf(f, "%%   'CLandmarksMap::saveToMATLABScript2D'\n");
	os::fprintf(f, "%%\n");
	os::fprintf(f, "%%                        ~ MRPT ~\n");
	os::fprintf(
		f, "%%  Jose Luis Blanco Claraco, University of Malaga @ 2006\n");
	os::fprintf(f, "%%  http://www.isa.uma.es/ \n");
	os::fprintf(
		f, "%%-------------------------------------------------------\n\n");

	// Main code:
	os::fprintf(f, "hold on;\n\n");

	for (auto& landmark : landmarks)
	{
		// Compute the eigen-vectors & values:
		cov(0, 0) = landmark.pose_cov_11;
		cov(1, 1) = landmark.pose_cov_22;
		cov(0, 1) = cov(1, 0) = landmark.pose_cov_12;

		std::vector<double> eigvals;
		cov.eig_symmetric(eigVec, eigvals);
		eigVal.setZero();
		eigVal.setDiagonal(eigvals);
		eigVal = eigVal.array().sqrt().matrix();
		M = eigVal.asEigen() * eigVec.transpose();

		// Compute the points of the ellipsoid:
		// ----------------------------------------------
		for (x = X.begin(), y = Y.begin(), Cos = COS.begin(), Sin = SIN.begin();
			 x != X.end(); x++, y++, Cos++, Sin++)
		{
			*x =
				(landmark.pose_mean.x +
				 stdCount * (*Cos * M(0, 0) + *Sin * M(1, 0)));
			*y =
				(landmark.pose_mean.y +
				 stdCount * (*Cos * M(0, 1) + *Sin * M(1, 1)));
		}

		// Save the code to plot the ellipsoid:
		// ----------------------------------------------
		os::fprintf(f, "plot([ ");
		for (x = X.begin(); x != X.end(); x++)
		{
			os::fprintf(f, "%.4f", *x);
			if (x != (X.end() - 1)) os::fprintf(f, ",");
		}
		os::fprintf(f, "],[ ");
		for (y = Y.begin(); y != Y.end(); y++)
		{
			os::fprintf(f, "%.4f", *y);
			if (y != (Y.end() - 1)) os::fprintf(f, ",");
		}

		os::fprintf(f, "],'%s');\n", style);

		// os::fprintf(f,"error_ellipse(c,m,'conf',0.99,'style','%s','numPointsEllipse',10);\n",style);
	}

	os::fprintf(f, "\naxis equal;\n");
	os::fclose(f);
	return true;
}

/*---------------------------------------------------------------
						loadOccupancyFeaturesFrom2DRangeScan
  ---------------------------------------------------------------*/
void CLandmarksMap::loadOccupancyFeaturesFrom2DRangeScan(
	const CObservation2DRangeScan& obs,
	const std::optional<const mrpt::poses::CPose3D>& robotPose,
	unsigned int downSampleFactor)
{
	unsigned int i, n = obs.getScanSize();
	double Th, dTh;	 // angle of the ray
	double J11, J12, J21, J22;	// The jacobian elements.
	double d;
	CPose3D sensorGlobalPose;

	// Empty the map:
	this->clear();

	// Sensor pose in 3D:
	if (!robotPose) sensorGlobalPose = obs.sensorPose;
	else
		sensorGlobalPose = *robotPose + obs.sensorPose;

	// Starting direction:
	if (obs.rightToLeft)
	{
		Th = -0.5 * obs.aperture;
		dTh = obs.aperture / n;
	}
	else
	{
		Th = +0.5 * obs.aperture;
		dTh = -obs.aperture / n;
	}

	// Measurement uncertainties:
	double var_d = square(0.005);  // square(obs.stdError);
	double var_th = square(dTh / 10.0);

	// For each range:
	for (i = 0; i < n; i += downSampleFactor, Th += downSampleFactor * dTh)
	{
		// If it is a valid ray:
		if (obs.getScanRangeValidity(i))
		{
			CLandmark newLandmark;

			// Timestamp:
			newLandmark.timestampLastSeen = obs.timestamp;
			newLandmark.seenTimesCount = 1;

			newLandmark.createOneFeature();
			newLandmark.features[0].type = featNotDefined;

			d = obs.getScanRange(i);

			// Compute the landmark in 2D:
			// -----------------------------------------------
			// Descriptor:
			newLandmark.features[0].orientation = Th;
			newLandmark.features[0].keypoint.octave = d;

			// Mean:
			newLandmark.pose_mean.x = (cos(Th) * d);
			newLandmark.pose_mean.y = (sin(Th) * d);
			newLandmark.pose_mean.z = 0;

			// Normal direction:
			newLandmark.normal = newLandmark.pose_mean;
			newLandmark.normal *= -1.0f / newLandmark.pose_mean.norm();

			// Jacobian:
			J11 = -d * sin(Th);
			J12 = cos(Th);
			J21 = d * cos(Th);
			J22 = sin(Th);

			// Covariance matrix:
			newLandmark.pose_cov_11 = (J11 * J11 * var_th + J12 * J12 * var_d);
			newLandmark.pose_cov_12 = (J11 * J21 * var_th + J12 * J22 * var_d);
			newLandmark.pose_cov_22 = (J21 * J21 * var_th + J22 * J22 * var_d);
			newLandmark.pose_cov_33 = (square(0.005));	// var_d;
			newLandmark.pose_cov_13 = newLandmark.pose_cov_23 = 0;

			// Append it:
			// -----------------------------------------------
			landmarks.push_back(newLandmark);

		}  // end of valid ray.

	}  // end for n

	// Take landmarks to 3D according to the robot & sensor 3D poses:
	// -----------------------------------------------
	changeCoordinatesReference(sensorGlobalPose);
}

/*---------------------------------------------------------------
				METHOD DESCRIBED IN PAPER
				-------------------------

		ICRA 2007,....

  ---------------------------------------------------------------*/
double CLandmarksMap::computeLikelihood_RSLC_2007(
	const CLandmarksMap* s, [[maybe_unused]] const CPose2D& sensorPose) const
{
	MRPT_START

	double lik = 1.0;
	TSequenceLandmarks::const_iterator itOther;
	double corr;
	double PrNoCorr;
	CPointPDFGaussian poseThis, poseOther;
	double nFoundCorrs = 0;
	unsigned int cx, cy, cx_1, cx_2, cy_1, cy_2;

	const auto grid = landmarks.getGrid();

	// For each landmark in the observations:
	for (itOther = s->landmarks.begin(); itOther != s->landmarks.end();
		 itOther++)
	{
		itOther->getPose(poseOther);

		cx = cy = grid->y2idx(itOther->pose_mean.y);

		cx_1 = max(0, grid->x2idx(itOther->pose_mean.x - 0.10f));
		cx_2 =
			min(static_cast<int>(grid->getSizeX()) - 1,
				grid->x2idx(itOther->pose_mean.x + 0.10f));
		cy_1 = max(0, grid->y2idx(itOther->pose_mean.y - 0.10f));
		cy_2 =
			min(static_cast<int>(grid->getSizeY()) - 1,
				grid->y2idx(itOther->pose_mean.y + 0.10f));

		// The likelihood of no correspondence starts at "1" and will be
		// modified next:
		PrNoCorr = 1;

		// For each landmark in this map: Compute its correspondence likelihood
		//   and conditioned observation likelihood:
		// itClosest = nullptr;

		// Look at landmarks in sourronding cells only:
		for (cx = cx_1; cx <= cx_2; cx++)
			for (cy = cy_1; cy <= cy_2; cy++)
			{
				auto corrs = grid->cellByIndex(cx, cy);
				ASSERT_(corrs != nullptr);
				if (!corrs->empty())
					for (auto it : *corrs)
					{
						auto lm = landmarks.get(it);

						// Compute the "correspondence" in the range [0,1]:
						// -------------------------------------------------------------

						// Shortcut:
						if (fabs(lm->pose_mean.x - itOther->pose_mean.x) >
								0.15f ||
							fabs(lm->pose_mean.y - itOther->pose_mean.y) >
								0.15f)
						{
							// Absolutely no correspondence, not need to compute
							// it:
							corr = 0;
						}
						else
						{
							lm->getPose(poseThis);
							corr = poseOther.productIntegralNormalizedWith2D(
								poseThis);
						}

						// The likelihood of no corresp. is proportional to the
						// product of all "1-CORRij":
						// -------------------------------------------------------------
						PrNoCorr *= 1 - corr;

					}  // end of each landmark in this map.
			}

		// Only consider this "point" if it has some real chance to has a
		// correspondence:
		nFoundCorrs += 1 - PrNoCorr;

		lik *= 1 - PrNoCorr;
	}  // enf for each landmark in the other map.

	lik = nFoundCorrs / static_cast<double>(s->size());

	lik = log(lik);

	MRPT_CHECK_NORMAL_NUMBER(lik);
	return lik;

	MRPT_END
}

/*---------------------------------------------------------------

					TCustomSequenceLandmarks

  ---------------------------------------------------------------*/
CLandmarksMap::TCustomSequenceLandmarks::TCustomSequenceLandmarks()
	: m_landmarks(), m_grid(-10.0f, 10.0f, -10.0f, 10.f, 0.20f)

{
}

void CLandmarksMap::TCustomSequenceLandmarks::clear()
{
	m_landmarks.clear();

	// Erase the grid:
	m_grid.clear();

	m_largestDistanceFromOriginIsUpdated = false;
}

void CLandmarksMap::TCustomSequenceLandmarks::push_back(const CLandmark& l)
{
	// Resize grid if necesary:
	std::vector<int32_t> dummyEmpty;

	m_grid.resize(
		min(m_grid.getXMin(), l.pose_mean.x - 0.1),
		max(m_grid.getXMax(), l.pose_mean.x + 0.1),
		min(m_grid.getYMin(), l.pose_mean.y - 0.1),
		max(m_grid.getYMax(), l.pose_mean.y + 0.1), dummyEmpty);

	m_landmarks.push_back(l);

	// Add to the grid:
	std::vector<int32_t>* cell = m_grid.cellByPos(l.pose_mean.x, l.pose_mean.y);
	ASSERT_(cell);
	cell->push_back(m_landmarks.size() - 1);

	m_largestDistanceFromOriginIsUpdated = false;
}

CLandmark* CLandmarksMap::TCustomSequenceLandmarks::get(unsigned int indx)
{
	return &m_landmarks[indx];
}

const CLandmark* CLandmarksMap::TCustomSequenceLandmarks::get(
	unsigned int indx) const
{
	return &m_landmarks[indx];
}

void CLandmarksMap::TCustomSequenceLandmarks::isToBeModified(unsigned int indx)
{
	std::vector<int32_t>* cell = m_grid.cellByPos(
		m_landmarks[indx].pose_mean.x, m_landmarks[indx].pose_mean.y);

	std::vector<int32_t>::iterator it;
	for (it = cell->begin(); it != cell->end(); it++)
	{
		if (*it == static_cast<int>(indx))
		{
			cell->erase(it);
			return;
		}
	}

	m_largestDistanceFromOriginIsUpdated = false;
}

void CLandmarksMap::TCustomSequenceLandmarks::erase(unsigned int indx)
{
	m_landmarks.erase(m_landmarks.begin() + indx);
	m_largestDistanceFromOriginIsUpdated = false;
}

void CLandmarksMap::TCustomSequenceLandmarks::hasBeenModified(unsigned int indx)
{
	std::vector<int32_t> dummyEmpty;

	// Resize grid if necesary:
	m_grid.resize(
		min(m_grid.getXMin(), m_landmarks[indx].pose_mean.x),
		max(m_grid.getXMax(), m_landmarks[indx].pose_mean.x),
		min(m_grid.getYMin(), m_landmarks[indx].pose_mean.y),
		max(m_grid.getYMax(), m_landmarks[indx].pose_mean.y), dummyEmpty);

	// Add to the grid:
	std::vector<int32_t>* cell = m_grid.cellByPos(
		m_landmarks[indx].pose_mean.x, m_landmarks[indx].pose_mean.y);
	cell->push_back(indx);
	m_largestDistanceFromOriginIsUpdated = false;
}

void CLandmarksMap::TCustomSequenceLandmarks::hasBeenModifiedAll()
{
	MRPT_START

	TSequenceLandmarks::iterator it;
	unsigned int idx;
	double min_x = -10.0, max_x = 10.0;
	double min_y = -10.0, max_y = 10.0;
	std::vector<int32_t> dummyEmpty;

	// Clear cells:
	m_grid.clear();

	// Resize the grid to the outer limits of landmarks:
	for (idx = 0, it = m_landmarks.begin(); it != m_landmarks.end();
		 idx++, it++)
	{
		min_x = min(min_x, it->pose_mean.x);
		max_x = max(max_x, it->pose_mean.x);
		min_y = min(min_y, it->pose_mean.y);
		max_y = max(max_y, it->pose_mean.y);
	}
	m_grid.resize(min_x, max_x, min_y, max_y, dummyEmpty);

	// Add landmarks to cells:
	for (idx = 0, it = m_landmarks.begin(); it != m_landmarks.end();
		 idx++, it++)
	{
		std::vector<int32_t>* cell =
			m_grid.cellByPos(it->pose_mean.x, it->pose_mean.y);
		cell->push_back(idx);
	}

	m_largestDistanceFromOriginIsUpdated = false;
	MRPT_END
}

/*---------------------------------------------------------------
						getLargestDistanceFromOrigin
---------------------------------------------------------------*/
float CLandmarksMap::TCustomSequenceLandmarks::getLargestDistanceFromOrigin()
	const
{
	// Updated?
	if (!m_largestDistanceFromOriginIsUpdated)
	{
		// NO: Update it:
		float maxDistSq = 0, d;
		for (const auto& it : *this)
		{
			d = square(it.pose_mean.x) + square(it.pose_mean.y) +
				square(it.pose_mean.z);
			maxDistSq = max(d, maxDistSq);
		}

		m_largestDistanceFromOrigin = sqrt(maxDistSq);
		m_largestDistanceFromOriginIsUpdated = true;
	}
	return m_largestDistanceFromOrigin;
}

/*---------------------------------------------------------------
					computeLikelihood_SIFT_LandmarkMap
  ---------------------------------------------------------------*/
double CLandmarksMap::computeLikelihood_SIFT_LandmarkMap(
	CLandmarksMap* theMap, TMatchingPairList* correspondences,
	std::vector<bool>* otherCorrespondences) const
{
	double lik = 0;	 // For 'traditional'
	double lik_i;
	unsigned long distDesc;
	double likByDist, likByDesc;

	std::vector<unsigned char>::const_iterator it1, it2;
	double K_dist = -0.5 / square(likelihoodOptions.SIFTs_mahaDist_std);
	double K_desc =
		-0.5 / square(likelihoodOptions.SIFTs_sigma_descriptor_dist);

	unsigned int idx1, idx2;
	CPointPDFGaussian lm1_pose, lm2_pose;
	CMatrixD dij(1, 3), Cij(3, 3), Cij_1;
	double distMahaFlik2;
	int decimation = likelihoodOptions.SIFTs_decimation;

	// USE INSERTOPTIONS METHOD
	switch (insertionOptions.SIFTLikelihoodMethod)
	{
		case 0:	 // Our method
		{
			// lik = 1e-9;		// For consensus
			lik = 1.0;	// For traditional

			TSequenceLandmarks::const_iterator lm1, lm2;
			for (idx1 = 0, lm1 = theMap->landmarks.begin();
				 lm1 < theMap->landmarks.end();
				 lm1 += decimation, idx1 += decimation)	 // Other theMap LM1
			{
				if (lm1->getType() == featSIFT)
				{
					// Get the pose of lm1 as an object:
					lm1->getPose(lm1_pose);

					lik_i = 0;	// Counter

					for (idx2 = 0, lm2 = landmarks.begin();
						 lm2 != landmarks.end();
						 lm2++, idx2++)	 // This theMap LM2
					{
						if (lm2->getType() == featSIFT)
						{
							// Get the pose of lm2 as an object:
							lm2->getPose(lm2_pose);

							// Compute the likelihood according to mahalanobis
							// distance:
							// Distance between means:
							dij(0, 0) = lm1->pose_mean.x - lm2->pose_mean.x;
							dij(0, 1) = lm1->pose_mean.y - lm2->pose_mean.y;
							dij(0, 2) = lm1->pose_mean.z - lm2->pose_mean.z;

							// std::cout << "ED POSICION: " << sqrt(
							// dij(0,0)*dij(0,0) + dij(0,1)*dij(0,1) +
							// dij(0,2)*dij(0,2) ) << std::endl;
							// Equivalent covariance from "i" to "j":
							Cij = CMatrixDouble(lm1_pose.cov + lm2_pose.cov);
							Cij_1 = Cij.inverse_LLt();

							distMahaFlik2 =
								mrpt::math::multiply_HCHt_scalar(dij, Cij_1);

							likByDist = exp(K_dist * distMahaFlik2);

							if (likByDist > 1e-2)
							{
								// If the EUCLIDEAN distance is not too large,
								// we compute the Descriptor distance
								// Compute Likelihood by descriptor
								// Compute distance between descriptors

								// IF the EDD has been already computed, we skip
								// this step!
								std::pair<
									mrpt::maps::CLandmark::TLandmarkID,
									mrpt::maps::CLandmark::TLandmarkID>
									mPair(lm2->ID, lm1->ID);
								// std::cout << "Par: (" << lm2->ID << "," <<
								// lm1->ID << ") -> ";

								if (CLandmarksMap::_mEDD[mPair] == 0)
								{
									distDesc = 0;
									ASSERT_(
										!lm1->features.empty() &&
										!lm2->features.empty());
									ASSERT_(
										lm1->features[0]
											.descriptors.SIFT->size() ==
										lm2->features[0]
											.descriptors.SIFT->size());

									for (it1 = lm1->features[0]
												   .descriptors.SIFT->begin(),
										it2 = lm2->features[0]
												  .descriptors.SIFT->begin();
										 it1 !=
										 lm1->features[0]
											 .descriptors.SIFT->end();
										 it1++, it2++)
										distDesc += square(*it1 - *it2);

									// Insert into the vector of Euclidean
									// distances
									CLandmarksMap::_mEDD[mPair] = distDesc;
								}  // end if
								else
								{
									distDesc = (unsigned long)
										CLandmarksMap::_mEDD[mPair];
								}
								likByDesc = exp(K_desc * distDesc);
								lik_i += likByDist *
									likByDesc;	// Cumulative Likelihood
							}
							else
							{
								// If the EUCLIDEAN distance is too large, we
								// assume that the cumulative likelihood is
								// (almost) zero.
								lik_i += 1e-10f;
							}
						}  // end if
					}  // end for "lm2"
					lik *= (0.1 + 0.9 * lik_i);	 // (TRADITIONAL) Total
				}
			}  // end for "lm1"
		}
		break;

		case 1:	 // SIM, ELINAS, GRIFFIN, LITTLE
			double dist;
			TMatchingPairList::iterator itCorr;

			lik = 1.0f;

			// Check if the Matches are inserted into the function
			if (correspondences == nullptr)
				THROW_EXCEPTION(
					"When using this method with SIFTLikelihoodMethod = 1, "
					"TMatchingPairList *correspondence can not be NULL");

			if (otherCorrespondences == nullptr)
				THROW_EXCEPTION(
					"When using this method with SIFTLikelihoodMethod = 1, "
					"std::vector<bool> *otherCorrespondences can not be NULL");

			for (itCorr = correspondences->begin();
				 itCorr != correspondences->end(); itCorr++)
			{
				auto lm1 = theMap->landmarks.get(itCorr->localIdx);
				auto lm2 = landmarks.get(itCorr->globalIdx);

				dij(0, 0) = lm1->pose_mean.x - lm2->pose_mean.x;
				dij(0, 1) = lm1->pose_mean.y - lm2->pose_mean.y;
				dij(0, 2) = lm1->pose_mean.z - lm2->pose_mean.z;

				// Equivalent covariance from "i" to "j":
				Cij = CMatrixDouble(lm1_pose.cov + lm2_pose.cov);
				Cij_1 = Cij.inverse_LLt();

				distMahaFlik2 = mrpt::math::multiply_HCHt_scalar(dij, Cij_1);

				dist = min(
					(double)likelihoodOptions.SIFTnullCorrespondenceDistance,
					distMahaFlik2);

				lik *= exp(-0.5 * dist);

			}  // end for correspondences

			// We complete the likelihood with the null correspondences
			for (size_t k = 1; k <= (theMap->size() - correspondences->size());
				 k++)
				lik *= likelihoodOptions.SIFTnullCorrespondenceDistance;

			break;

	}  // end switch

	lik = log(lik);
	MRPT_CHECK_NORMAL_NUMBER(lik);
	return lik;
}

/*---------------------------------------------------------------
					TInsertionOptions
  ---------------------------------------------------------------*/
CLandmarksMap::TInsertionOptions::TInsertionOptions()
	:

	  SIFT_feat_options(vision::featSIFT)
{
}

/*---------------------------------------------------------------
					dumpToTextStream
  ---------------------------------------------------------------*/
void CLandmarksMap::TInsertionOptions::dumpToTextStream(std::ostream& out) const
{
	out << "\n----------- [CLandmarksMap::TInsertionOptions] ------------ \n\n";

	out << mrpt::format(
		"insert_SIFTs_from_monocular_images      = %c\n",
		insert_SIFTs_from_monocular_images ? 'Y' : 'N');
	out << mrpt::format(
		"insert_SIFTs_from_stereo_images         = %c\n",
		insert_SIFTs_from_stereo_images ? 'Y' : 'N');
	out << mrpt::format(
		"insert_Landmarks_from_range_scans       = %c\n",
		insert_Landmarks_from_range_scans ? 'Y' : 'N');
	out << "\n";
	out << mrpt::format(
		"SiftCorrRatioThreshold                  = %f\n",
		SiftCorrRatioThreshold);
	out << mrpt::format(
		"SiftLikelihoodThreshold                 = %f\n",
		SiftLikelihoodThreshold);
	out << mrpt::format(
		"SiftEDDThreshold                        = %f\n", SiftEDDThreshold);
	out << mrpt::format(
		"SIFTMatching3DMethod                    = %d\n", SIFTMatching3DMethod);
	out << mrpt::format(
		"SIFTLikelihoodMethod                    = %d\n", SIFTLikelihoodMethod);

	out << mrpt::format(
		"SIFTsLoadDistanceOfTheMean              = %f\n",
		SIFTsLoadDistanceOfTheMean);
	out << mrpt::format(
		"SIFTsLoadEllipsoidWidth                 = %f\n",
		SIFTsLoadEllipsoidWidth);
	out << "\n";
	out << mrpt::format(
		"SIFTs_stdXY                             = %f\n", SIFTs_stdXY);
	out << mrpt::format(
		"SIFTs_stdDisparity                      = %f\n", SIFTs_stdDisparity);
	out << "\n";
	out << mrpt::format(
		"SIFTs_numberOfKLTKeypoints              = %i\n",
		SIFTs_numberOfKLTKeypoints);
	out << mrpt::format(
		"SIFTs_stereo_maxDepth                   = %f\n",
		SIFTs_stereo_maxDepth);
	out << mrpt::format(
		"SIFTs_epipolar_TH                       = %f\n", SIFTs_epipolar_TH);
	out << mrpt::format(
		"PLOT_IMAGES                             = %c\n",
		PLOT_IMAGES ? 'Y' : 'N');

	SIFT_feat_options.dumpToTextStream(out);

	out << "\n";
}

/*---------------------------------------------------------------
					loadFromConfigFile
  ---------------------------------------------------------------*/
void CLandmarksMap::TInsertionOptions::loadFromConfigFile(
	const mrpt::config::CConfigFileBase& iniFile, const std::string& section)
{
	insert_SIFTs_from_monocular_images = iniFile.read_bool(
		section.c_str(), "insert_SIFTs_from_monocular_images",
		insert_SIFTs_from_monocular_images);
	insert_SIFTs_from_stereo_images = iniFile.read_bool(
		section.c_str(), "insert_SIFTs_from_stereo_images",
		insert_SIFTs_from_stereo_images);
	insert_Landmarks_from_range_scans = iniFile.read_bool(
		section.c_str(), "insert_Landmarks_from_range_scans",
		insert_Landmarks_from_range_scans);
	SiftCorrRatioThreshold = iniFile.read_float(
		section.c_str(), "SiftCorrRatioThreshold", SiftCorrRatioThreshold);
	SiftLikelihoodThreshold = iniFile.read_float(
		section.c_str(), "SiftLikelihoodThreshold", SiftLikelihoodThreshold);
	SiftEDDThreshold = iniFile.read_float(
		section.c_str(), "SiftEDDThreshold", SiftEDDThreshold);
	SIFTMatching3DMethod = iniFile.read_int(
		section.c_str(), "SIFTMatching3DMethod", SIFTMatching3DMethod);
	SIFTLikelihoodMethod = iniFile.read_int(
		section.c_str(), "SIFTLikelihoodMethod", SIFTLikelihoodMethod);
	SIFTsLoadDistanceOfTheMean = iniFile.read_float(
		section.c_str(), "SIFTsLoadDistanceOfTheMean",
		SIFTsLoadDistanceOfTheMean);
	SIFTsLoadEllipsoidWidth = iniFile.read_float(
		section.c_str(), "SIFTsLoadEllipsoidWidth", SIFTsLoadEllipsoidWidth);
	SIFTs_stdXY =
		iniFile.read_float(section.c_str(), "SIFTs_stdXY", SIFTs_stdXY);
	SIFTs_stdDisparity = iniFile.read_float(
		section.c_str(), "SIFTs_stdDisparity", SIFTs_stdDisparity);
	SIFTs_numberOfKLTKeypoints = iniFile.read_int(
		section.c_str(), "SIFTs_numberOfKLTKeypoints",
		SIFTs_numberOfKLTKeypoints);
	SIFTs_stereo_maxDepth = iniFile.read_float(
		section.c_str(), "SIFTs_stereo_maxDepth", SIFTs_stereo_maxDepth);
	SIFTs_epipolar_TH = iniFile.read_float(
		section.c_str(), "SIFTs_epipolar_TH", SIFTs_epipolar_TH);
	PLOT_IMAGES =
		iniFile.read_bool(section.c_str(), "PLOT_IMAGES", PLOT_IMAGES);

	SIFT_feat_options.loadFromConfigFile(iniFile, section);
}

/*---------------------------------------------------------------
					TLikelihoodOptions
  ---------------------------------------------------------------*/
CLandmarksMap::TLikelihoodOptions::TLikelihoodOptions()
	: SIFT_feat_options(vision::featSIFT),

	  GPSOrigin()

{
}

CLandmarksMap::TLikelihoodOptions::TGPSOrigin::TGPSOrigin()

	= default;

/*---------------------------------------------------------------
					dumpToTextStream
  ---------------------------------------------------------------*/
void CLandmarksMap::TLikelihoodOptions::dumpToTextStream(
	std::ostream& out) const
{
	out << "\n----------- [CLandmarksMap::TLikelihoodOptions] ------------ "
		   "\n\n";

	out << mrpt::format(
		"rangeScan2D_decimation                  = %i\n",
		rangeScan2D_decimation);
	out << mrpt::format(
		"SIFTs_sigma_euclidean_dist              = %f\n",
		SIFTs_sigma_euclidean_dist);
	out << mrpt::format(
		"SIFTs_sigma_descriptor_dist             = %f\n",
		SIFTs_sigma_descriptor_dist);
	out << mrpt::format(
		"SIFTs_mahaDist_std                      = %f\n", SIFTs_mahaDist_std);
	out << mrpt::format(
		"SIFTs_decimation                        = %i\n", SIFTs_decimation);
	out << mrpt::format(
		"SIFTnullCorrespondenceDistance          = %f\n",
		SIFTnullCorrespondenceDistance);
	out << mrpt::format(
		"beaconRangesStd                         = %f\n", beaconRangesStd);
	out << mrpt::format(
		"beaconRangesUseObservationStd           = %c\n",
		beaconRangesUseObservationStd ? 'Y' : 'N');
	out << mrpt::format(
		"extRobotPoseStd                         = %f\n", extRobotPoseStd);

	out << mrpt::format(
		"GPSOrigin:LATITUDE                      = %f\n", GPSOrigin.latitude);
	out << mrpt::format(
		"GPSOrigin:LONGITUDE                     = %f\n", GPSOrigin.longitude);
	out << mrpt::format(
		"GPSOrigin:ALTITUDE                      = %f\n", GPSOrigin.altitude);
	out << mrpt::format(
		"GPSOrigin:Rotation_Angle                = %f\n", GPSOrigin.ang);
	out << mrpt::format(
		"GPSOrigin:x_shift                       = %f\n", GPSOrigin.x_shift);
	out << mrpt::format(
		"GPSOrigin:y_shift                       = %f\n", GPSOrigin.y_shift);
	out << mrpt::format(
		"GPSOrigin:min_sat                       = %i\n", GPSOrigin.min_sat);

	out << mrpt::format(
		"GPS_sigma                               = %f (m)\n", GPS_sigma);

	SIFT_feat_options.dumpToTextStream(out);

	out << "\n";
}

/*---------------------------------------------------------------
					loadFromConfigFile
  ---------------------------------------------------------------*/
void CLandmarksMap::TLikelihoodOptions::loadFromConfigFile(
	const mrpt::config::CConfigFileBase& iniFile, const std::string& section)
{
	rangeScan2D_decimation = iniFile.read_int(
		section.c_str(), "rangeScan2D_decimation", rangeScan2D_decimation);
	SIFTs_sigma_euclidean_dist = iniFile.read_double(
		section.c_str(), "SIFTs_sigma_euclidean_dist",
		SIFTs_sigma_euclidean_dist);
	SIFTs_sigma_descriptor_dist = iniFile.read_double(
		section.c_str(), "SIFTs_sigma_descriptor_dist",
		SIFTs_sigma_descriptor_dist);
	SIFTs_mahaDist_std = iniFile.read_float(
		section.c_str(), "SIFTs_mahaDist_std", SIFTs_mahaDist_std);
	SIFTs_decimation =
		iniFile.read_int(section.c_str(), "SIFTs_decimation", SIFTs_decimation);
	SIFTnullCorrespondenceDistance = iniFile.read_float(
		section.c_str(), "SIFTnullCorrespondenceDistance",
		SIFTnullCorrespondenceDistance);

	GPSOrigin.latitude = iniFile.read_double(
		section.c_str(), "GPSOriginLatitude", GPSOrigin.latitude);
	GPSOrigin.longitude = iniFile.read_double(
		section.c_str(), "GPSOriginLongitude", GPSOrigin.longitude);
	GPSOrigin.altitude = iniFile.read_double(
		section.c_str(), "GPSOriginAltitude", GPSOrigin.altitude);
	GPSOrigin.ang =
		iniFile.read_double(section.c_str(), "GPSOriginAngle", GPSOrigin.ang) *
		M_PI / 180;
	GPSOrigin.x_shift = iniFile.read_double(
		section.c_str(), "GPSOriginXshift", GPSOrigin.x_shift);
	GPSOrigin.y_shift = iniFile.read_double(
		section.c_str(), "GPSOriginYshift", GPSOrigin.y_shift);
	GPSOrigin.min_sat =
		iniFile.read_int(section.c_str(), "GPSOriginMinSat", GPSOrigin.min_sat);

	GPS_sigma = iniFile.read_float(section.c_str(), "GPSSigma", GPS_sigma);

	beaconRangesStd =
		iniFile.read_float(section.c_str(), "beaconRangesStd", beaconRangesStd);
	beaconRangesUseObservationStd = iniFile.read_bool(
		section.c_str(), "beaconRangesUseObservationStd",
		beaconRangesUseObservationStd);

	extRobotPoseStd =
		iniFile.read_float(section.c_str(), "extRobotPoseStd", extRobotPoseStd);

	SIFT_feat_options.loadFromConfigFile(iniFile, section);
}

/*---------------------------------------------------------------
					TFuseOptions
  ---------------------------------------------------------------*/
CLandmarksMap::TFuseOptions::TFuseOptions()

	= default;

/*---------------------------------------------------------------
					 isEmpty
  ---------------------------------------------------------------*/
bool CLandmarksMap::isEmpty() const { return size() == 0; }
/*---------------------------------------------------------------
					 simulateBeaconReadings
  ---------------------------------------------------------------*/
void CLandmarksMap::simulateBeaconReadings(
	const CPose3D& in_robotPose, const CPoint3D& in_sensorLocationOnRobot,
	mrpt::obs::CObservationBeaconRanges& out_Observations) const
{
	TSequenceLandmarks::const_iterator it;
	mrpt::obs::CObservationBeaconRanges::TMeasurement newMeas;
	CPoint3D point3D, beacon3D;
	CPointPDFGaussian beaconPDF;

	// Compute the 3D position of the sensor:
	point3D = in_robotPose + in_sensorLocationOnRobot;

	// Clear output data:
	out_Observations.sensedData.clear();
	out_Observations.timestamp = mrpt::system::getCurrentTime();

	// For each BEACON landmark in the map:
	for (it = landmarks.begin(); it != landmarks.end(); it++)
	{
		if (it->getType() == featBeacon)
		{
			// Get the 3D position of the beacon (just the mean value):
			it->getPose(beaconPDF);
			beacon3D = beaconPDF.mean;

			float range = point3D.distanceTo(beacon3D);

			// Add noise:
			range += out_Observations.stdError *
				getRandomGenerator().drawGaussian1D_normalized();
			range = max(0.0f, range);

			if (range >= out_Observations.minSensorDistance &&
				range <= out_Observations.maxSensorDistance)
			{
				// Fill out:
				newMeas.beaconID = it->ID;
				newMeas.sensorLocationOnRobot = in_sensorLocationOnRobot;
				newMeas.sensedDistance = range;

				// Insert:
				out_Observations.sensedData.push_back(newMeas);
			}
		}  // end if beacon
	}  // end for it
	// Done!
}

/*---------------------------------------------------------------
					 saveMetricMapRepresentationToFile
  ---------------------------------------------------------------*/
void CLandmarksMap::saveMetricMapRepresentationToFile(
	const std::string& filNamePrefix) const
{
	MRPT_START

	// Matlab:
	std::string fil1(filNamePrefix + std::string("_3D.m"));
	saveToMATLABScript3D(fil1);

	// 3D Scene:
	opengl::COpenGLScene scene;

	opengl::CGridPlaneXY::Ptr objGround =
		std::make_shared<opengl::CGridPlaneXY>(-100, 100, -100, 100, 0, 1);

	scene.insert(getVisualization());
	scene.insert(objGround);

	std::string fil2(filNamePrefix + std::string("_3D.3Dscene"));
	scene.saveToFile(fil2);

	MRPT_END
}

/*---------------------------------------------------------------
						getAs3DObject
  ---------------------------------------------------------------*/
void CLandmarksMap::getVisualizationInto(mrpt::opengl::CSetOfObjects& o) const
{
	if (!genericMapParams.enableSaveAs3DObject) return;

	// TODO: Generate patchs in 3D, etc...

	// Save 3D ellipsoids
	CPointPDFGaussian pointGauss;
	for (const auto& landmark : landmarks)
	{
		opengl::CEllipsoid3D::Ptr ellip =
			std::make_shared<opengl::CEllipsoid3D>();

		landmark.getPose(pointGauss);

		ellip->setPose(pointGauss.mean);
		ellip->setCovMatrix(pointGauss.cov);
		ellip->enableDrawSolid3D(false);
		ellip->setQuantiles(3.0);
		ellip->set3DsegmentsCount(10);
		ellip->setColor(0, 0, 1);
		ellip->setName(
			mrpt::format("LM.ID=%u", static_cast<unsigned int>(landmark.ID)));
		ellip->enableShowName(true);

		o.insert(ellip);
	}
}
/**** FAMD ****/
mrpt::maps::CLandmark::TLandmarkID CLandmarksMap::getMapMaxID()
{
	return _mapMaxID;
}
/**** END FAMD ****/

const CLandmark* CLandmarksMap::TCustomSequenceLandmarks::getByID(
	CLandmark::TLandmarkID ID) const
{
	for (const auto& m_landmark : m_landmarks)
	{
		if (m_landmark.ID == ID) return &m_landmark;
	}
	return nullptr;
}

// CLandmark* 	CLandmarksMap::TCustomSequenceLandmarks::getByID(
// CLandmark::TLandmarkID ID )
//{
//	for(size_t indx = 0; indx < m_landmarks.size(); indx++)
//	{
//		if( m_landmarks[indx].ID == ID )
//			return &m_landmarks[indx];
//	}
//	return nullptr;
//}

const CLandmark* CLandmarksMap::TCustomSequenceLandmarks::getByBeaconID(
	unsigned int ID) const
{
	for (const auto& m_landmark : m_landmarks)
	{
		if (m_landmark.ID == ID) return &m_landmark;
	}
	return nullptr;
}

/*---------------------------------------------------------------
   Computes the ratio in [0,1] of correspondences between "this" and the
 "otherMap" map, whose 6D pose relative to "this" is "otherMapPose"
 *   In the case of a multi-metric map, this returns the average between the
 maps. This method always return 0 for grid maps.
 * \param  otherMap					  [IN] The other map to compute the matching
 with.
 * \param  otherMapPose				  [IN] The 6D pose of the other map as seen
 from "this".
 * \param  maxDistForCorr			  [IN] The minimum distance between 2
 non-probabilistic map elements for counting them as a correspondence.
 * \param  maxMahaDistForCorr		  [IN] The minimum Mahalanobis distance
 between 2 probabilistic map elements for counting them as a correspondence.
 *
 * \return The matching ratio [0,1]
 * \sa computeMatchingWith2D
 ----------------------------------------------------------------*/
float CLandmarksMap::compute3DMatchingRatio(
	const mrpt::maps::CMetricMap* otherMap2,
	const mrpt::poses::CPose3D& otherMapPose,
	const TMatchingRatioParams& params) const
{
	MRPT_START

	// Compare to a similar map only:
	const CLandmarksMap* otherMap = nullptr;

	if (otherMap2->GetRuntimeClass() == CLASS_ID(CLandmarksMap))
		otherMap = dynamic_cast<const CLandmarksMap*>(otherMap2);

	if (!otherMap) return 0;

	TCustomSequenceLandmarks::const_iterator itThis, itOther;
	std::deque<CPointPDFGaussian::Ptr> poses3DThis, poses3DOther;
	std::deque<CPointPDFGaussian::Ptr>::iterator itPoseThis, itPoseOther;
	CPointPDFGaussian tempPose;
	size_t nThis = landmarks.size();
	size_t nOther = otherMap->landmarks.size();
	size_t otherLandmarkWithCorrespondence = 0;

	// Checks:
	if (!nThis) return 0;
	if (!nOther) return 0;

	// The transformation:
	CMatrixDouble44 pose3DMatrix;
	otherMapPose.getHomogeneousMatrix(pose3DMatrix);
	float Tx = pose3DMatrix(0, 3);
	float Ty = pose3DMatrix(1, 3);
	float Tz = pose3DMatrix(2, 3);

	// ---------------------------------------------------------------------------------------------------------------
	// Is there any "contact" between the spheres that contain all the points
	// from each map after translating them??
	// (Note that we can avoid computing the rotation of all the points if this
	// test fail, with a great speed up!)
	// ---------------------------------------------------------------------------------------------------------------
	if (sqrt(square(Tx) + square(Ty) + square(Tz)) >=
		(landmarks.getLargestDistanceFromOrigin() +
		 otherMap->landmarks.getLargestDistanceFromOrigin() + 1.0f))
		return 0;  // There is no contact!

	// Prepare:
	poses3DOther.resize(nOther);
	for (size_t i = 0; i < nOther; i++)
		poses3DOther[i] = std::make_shared<CPointPDFGaussian>();

	poses3DThis.resize(nThis);
	for (size_t i = 0; i < nThis; i++)
		poses3DThis[i] = std::make_shared<CPointPDFGaussian>();

	// Save 3D poses of the other map with transformed coordinates:
	for (itOther = otherMap->landmarks.begin(),
		itPoseOther = poses3DOther.begin();
		 itOther != otherMap->landmarks.end(); itOther++, itPoseOther++)
	{
		itOther->getPose(**itPoseOther);
		(*itPoseOther)->changeCoordinatesReference(otherMapPose);
	}

	// And the 3D poses of "this" map:
	for (itThis = landmarks.begin(), itPoseThis = poses3DThis.begin();
		 itThis != landmarks.end(); itThis++, itPoseThis++)
	{
		itThis->getPose(**itPoseThis);
	}

	// Check whether each "other"'s LM has a correspondence or not:
	for (itOther = otherMap->landmarks.begin(),
		itPoseOther = poses3DOther.begin();
		 itOther != otherMap->landmarks.end(); itOther++, itPoseOther++)
	{
		for (itThis = landmarks.begin(), itPoseThis = poses3DThis.begin();
			 itThis != landmarks.end(); itThis++, itPoseThis++)
		{
			CMatrixDouble COV =
				CMatrixDouble((*itPoseThis)->cov + (*itPoseOther)->cov);
			TPoint3D D(
				(*itPoseThis)->mean.x() - (*itPoseOther)->mean.x(),
				(*itPoseThis)->mean.y() - (*itPoseOther)->mean.y(),
				(*itPoseThis)->mean.z() - (*itPoseOther)->mean.z());
			CMatrixDouble d(1, 3);
			d(0, 0) = D.x;
			d(0, 1) = D.y;
			d(0, 2) = D.z;

			float distMaha =
				sqrt(mrpt::math::multiply_HCHt_scalar(d, COV.inverse_LLt()));

			if (distMaha < params.maxMahaDistForCorr)
			{
				// Now test the SIFT descriptors:
				if (!itThis->features.empty() && !itOther->features.empty() &&
					itThis->features[0].descriptors.SIFT->size() ==
						itOther->features[0].descriptors.SIFT->size())
				{
					unsigned long descrDist = 0;
					std::vector<unsigned char>::const_iterator it1, it2;
					for (it1 = itThis->features[0].descriptors.SIFT->begin(),
						it2 = itOther->features[0].descriptors.SIFT->begin();
						 it1 != itThis->features[0].descriptors.SIFT->end();
						 it1++, it2++)
						descrDist += square(*it1 - *it2);

					float descrDist_f = sqrt(d2f(descrDist)) /
						itThis->features[0].descriptors.SIFT->size();

					if (descrDist_f < 1.5f)
					{
						otherLandmarkWithCorrespondence++;
						break;	// Go to the next "other" LM
					}
				}
			}
		}  // for each in "this"

	}  // for each in "other"

	return d2f(otherLandmarkWithCorrespondence) / nOther;

	MRPT_END
}

/*---------------------------------------------------------------
					auxParticleFilterCleanUp
 ---------------------------------------------------------------*/
void CLandmarksMap::auxParticleFilterCleanUp()
{
	_mEDD.clear();
	_maxIDUpdated = false;
}

/*---------------------------------------------------------------
					simulateRangeBearingReadings
 ---------------------------------------------------------------*/
void CLandmarksMap::simulateRangeBearingReadings(
	const CPose3D& in_robotPose, const CPose3D& in_sensorLocationOnRobot,
	CObservationBearingRange& out_Observations, bool sensorDetectsIDs,
	const float in_stdRange, const float in_stdYaw, const float in_stdPitch,
	std::vector<size_t>* out_real_associations,
	const double spurious_count_mean, const double spurious_count_std) const
{
	TSequenceLandmarks::const_iterator it;
	size_t idx;
	mrpt::obs::CObservationBearingRange::TMeasurement newMeas;
	CPoint3D beacon3D;
	CPointPDFGaussian beaconPDF;

	if (out_real_associations) out_real_associations->clear();

	// Compute the 3D position of the sensor:
	const CPose3D point3D = in_robotPose + CPose3D(in_sensorLocationOnRobot);

	// Clear output data:
	out_Observations.validCovariances = false;
	out_Observations.sensor_std_range = in_stdRange;
	out_Observations.sensor_std_yaw = in_stdYaw;
	out_Observations.sensor_std_pitch = in_stdPitch;

	out_Observations.sensedData.clear();
	out_Observations.timestamp = mrpt::system::getCurrentTime();
	out_Observations.sensorLocationOnRobot = in_sensorLocationOnRobot;

	// For each BEACON landmark in the map:
	// ------------------------------------------
	for (idx = 0, it = landmarks.begin(); it != landmarks.end(); ++it, ++idx)
	{
		// Get the 3D position of the beacon (just the mean value):
		it->getPose(beaconPDF);
		beacon3D = CPoint3D(beaconPDF.mean);

		// Compute yaw,pitch,range:
		double range, yaw, pitch;
		point3D.sphericalCoordinates(beacon3D.asTPoint(), range, yaw, pitch);

		// Add noises:
		range += in_stdRange * getRandomGenerator().drawGaussian1D_normalized();
		yaw += in_stdYaw * getRandomGenerator().drawGaussian1D_normalized();
		pitch += in_stdPitch * getRandomGenerator().drawGaussian1D_normalized();

		yaw = math::wrapToPi(yaw);
		range = max(0.0, range);

		if (range >= out_Observations.minSensorDistance &&
			range <= out_Observations.maxSensorDistance &&
			fabs(yaw) <= 0.5f * out_Observations.fieldOfView_yaw &&
			fabs(pitch) <= 0.5f * out_Observations.fieldOfView_pitch)
		{
			// Fill out:
			if (sensorDetectsIDs) newMeas.landmarkID = it->ID;
			else
				newMeas.landmarkID = INVALID_LANDMARK_ID;
			newMeas.range = range;
			newMeas.yaw = yaw;
			newMeas.pitch = pitch;

			// Insert:
			out_Observations.sensedData.push_back(newMeas);

			if (out_real_associations)
				out_real_associations->push_back(idx);	// Real indices.
		}
	}  // end for it

	const double fSpurious = getRandomGenerator().drawGaussian1D(
		spurious_count_mean, spurious_count_std);
	size_t nSpurious = 0;
	if (spurious_count_std != 0 || spurious_count_mean != 0)
		nSpurious =
			static_cast<size_t>(mrpt::round_long(std::max(0.0, fSpurious)));

	// For each spurios reading to generate:
	// ------------------------------------------
	for (size_t i = 0; i < nSpurious; i++)
	{
		// Make up yaw,pitch,range out from thin air:
		// (the conditionals on yaw & pitch are to generate 2D observations if
		// we are in 2D, which we learn from a null std.dev.)
		const double range = getRandomGenerator().drawUniform(
			out_Observations.minSensorDistance,
			out_Observations.maxSensorDistance);
		const double yaw = (out_Observations.sensor_std_yaw == 0)
			? 0
			: getRandomGenerator().drawUniform(
				  -0.5f * out_Observations.fieldOfView_yaw,
				  0.5f * out_Observations.fieldOfView_yaw);
		const double pitch = (out_Observations.sensor_std_pitch == 0)
			? 0
			: getRandomGenerator().drawUniform(
				  -0.5f * out_Observations.fieldOfView_pitch,
				  0.5f * out_Observations.fieldOfView_pitch);

		// Fill out:
		newMeas.landmarkID =
			INVALID_LANDMARK_ID;  // Always invalid ID since it's spurious
		newMeas.range = range;
		newMeas.yaw = yaw;
		newMeas.pitch = pitch;

		// Insert:
		out_Observations.sensedData.push_back(newMeas);

		if (out_real_associations)
			out_real_associations->push_back(
				std::string::npos);	 // Real index: spurious
	}  // end for it

	// Done!
}
