org.jgrasstools.lesto.modules.vegetation.OmsPointCloudMaximaFinder Maven / Gradle / Ivy
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/*
* This file is part of JGrasstools (http://www.jgrasstools.org)
* (C) HydroloGIS - www.hydrologis.com
*
* JGrasstools is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see inLas = null;
@Description(inDtm_DESCR)
@In
public GridCoverage2D inDtm;
@Description(inRoi_DESCR)
@In
public SimpleFeatureCollection inRoi;
@Description(inDsmDtmDiff_DESCR)
@In
public GridCoverage2D inDsmDtmDiff;
@Description(pMaxRadius_DESCR)
@In
public double pMaxRadius = -1.0;
@Description(doDynamicRadius_DESCR)
@In
public boolean doDynamicRadius = true;
@Description(pElevDiffThres_DESCR)
@In
public double pElevDiffThres = 3.5;
@Description(outTops_DESCR)
@In
public SimpleFeatureCollection outTops = null;
// VARS DOCS START
public static final String outTops_DESCR = "The output local maxima.";
public static final String pClass_DESCR = "The comma separated list of classes to filter (if empty, all are picked).";
public static final String pThreshold_DESCR = "The elevation threshold to apply to the chm.";
public static final String pElevDiffThres_DESCR = "Max permitted elevation difference around the maxima.";
public static final String doDynamicRadius_DESCR = "Use an adaptive radius based on the height.";
public static final String pMaxRadius_DESCR = "Radius for which a point can be local maxima.";
public static final String inDsmDtmDiff_DESCR = "An optional dsm-dtm difference raster to use to check on the extracted tops.";
public static final String inRoi_DESCR = "A set of polygons to use as region of interest.";
public static final String inDtm_DESCR = "A dtm raster to use for the area of interest and to calculate the elevation threshold.";
public static final String inLas_DESCR = "The input las.";
public static final String NAME = "pointcloudmaximafinder";
public static final String KEYWORDS = "Local maxima, las, lidar";
public static final String DESCR = "Module that identifies local maxima in point clouds.";
public static final String LABEL = JGTConstants.LESTO + "/vegetation";
// VARS DOCS END
private AtomicInteger index = new AtomicInteger();
@Execute
public void process() throws Exception {
checkNull(inLas);
if (inRoi == null && inDtm == null) {
throw new ModelsIllegalargumentException("At least one of raster or vector roi is necessary.", this);
}
CoordinateReferenceSystem crs = null;
List regionGeometries = new ArrayList();
if (inRoi != null) {
regionGeometries = FeatureUtilities.featureCollectionToGeometriesList(inRoi, true, null);
crs = inRoi.getBounds().getCoordinateReferenceSystem();
} else {
// use the dtm bounds
Polygon polygon = CoverageUtilities.getRegionPolygon(inDtm);
regionGeometries.add(polygon);
crs = inDtm.getCoordinateReferenceSystem();
}
outTops = new DefaultFeatureCollection();
SimpleFeatureBuilder lasBuilder = LasUtils.getLasFeatureBuilder(crs);
DsmDtmDiffHelper helper = null;
if (inDsmDtmDiff != null) {
helper = new DsmDtmDiffHelper();
helper.pElevDiffThres = pElevDiffThres;
helper.gridGeometry = inDsmDtmDiff.getGridGeometry();
RegionMap regionMap = CoverageUtilities.getRegionParamsFromGridCoverage(inDsmDtmDiff);
helper.cols = regionMap.getCols();
helper.rows = regionMap.getRows();
helper.xres = regionMap.getXres();
helper.yres = regionMap.getYres();
helper.dsmDtmDiffIter = CoverageUtilities.getRandomIterator(inDsmDtmDiff);
}
try {
doProcess(inLas, pMaxRadius, doDynamicRadius, helper, (DefaultFeatureCollection) outTops, lasBuilder, index, pm);
} catch (Exception e) {
e.printStackTrace();
}
if (helper != null)
helper.dsmDtmDiffIter.done();
}
public static void doProcess( final List pointsInTile, final double pMaxRadius, final boolean doDynamicRadius,
final DsmDtmDiffHelper helper, final DefaultFeatureCollection outTopsFC, final SimpleFeatureBuilder lasBuilder,
final AtomicInteger index, final IJGTProgressMonitor pm ) throws Exception {
/*
* we use the intensity value to mark local maxima
* - 1 = maxima
* - 0 = non maxima
*/
final GeometryFactory gf = new GeometryFactory();
pm.beginTask("Mark local maxima...", pointsInTile.size());
ExecutorService fixedThreadPool = Executors.newFixedThreadPool(getDefaultThreadsNum());
for( final LasRecord currentDot : pointsInTile ) {
Runnable runner = new Runnable(){
public void run() {
try {
// check if it is a local maxima
boolean isLocalMaxima = true;
for( LasRecord tmpDot : pointsInTile ) {
double distance = LasUtils.distance(currentDot, tmpDot);
double maxRadius = pMaxRadius;
if (doDynamicRadius) {
// use Popescu lowered to 70% (Popescu & Kini 2004 for mixed pines
// and
// deciduous trees)
maxRadius = (2.51503 + 0.00901 * pow(currentDot.groundElevation, 2.0)) / 2.0 * 0.7;
if (maxRadius > pMaxRadius) {
maxRadius = pMaxRadius;
}
}
if (distance > maxRadius) {
continue;
}
if (tmpDot.groundElevation > currentDot.groundElevation) {
// not local maxima
isLocalMaxima = false;
break;
}
}
// mark it
if (isLocalMaxima) {
if (helper != null) {
// check if it is some border or noise
GridCoordinates2D gridCoord = helper.gridGeometry.worldToGrid(new DirectPosition2D(currentDot.x,
currentDot.y));
GridNode node = new GridNode(helper.dsmDtmDiffIter, helper.cols, helper.rows, helper.xres,
helper.yres, gridCoord.x, gridCoord.y);
double topElevation = node.elevation;
if (!node.isValid() || node.touchesBound()) {
isLocalMaxima = false;
} else {
List validSurroundingNodes = node.getValidSurroundingNodes();
for( GridNode tmpNode : validSurroundingNodes ) {
double tmpElevation = tmpNode.elevation;
if (abs(topElevation - tmpElevation) > helper.pElevDiffThres) {
isLocalMaxima = false;
}
}
}
}
if (isLocalMaxima) {
synchronized (lasBuilder) {
final Point point = gf.createPoint(new Coordinate(currentDot.x, currentDot.y));
double groundElevation = currentDot.groundElevation;
// round to meter with 1 decimal
groundElevation = ((int) round(groundElevation * 10)) / 10.0;
final Object[] values = new Object[]{point, index.getAndIncrement(), groundElevation,
currentDot.intensity, currentDot.classification, currentDot.returnNumber,
currentDot.numberOfReturns};
lasBuilder.addAll(values);
final SimpleFeature feature = lasBuilder.buildFeature(null);
outTopsFC.add(feature);
}
}
}
} catch (Exception e) {
e.printStackTrace();
} finally {
pm.worked(1);
}
}
};
fixedThreadPool.execute(runner);
}
try {
fixedThreadPool.shutdown();
fixedThreadPool.awaitTermination(30, TimeUnit.DAYS);
fixedThreadPool.shutdownNow();
} catch (InterruptedException e) {
e.printStackTrace();
}
pm.done();
}
static class DsmDtmDiffHelper {
double pElevDiffThres;
GridGeometry2D gridGeometry;
RegionMap regionMap;
int cols;
int rows;
double xres;
double yres;
RandomIter dsmDtmDiffIter;
}
}
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