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[SEDONA-332] Make RS_Values only fetch relevant tiles, instead of fetching the entire raster #931

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Jul 28, 2023
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[SEDONA-332] Make RS_Values only fetch relevant tiles, instead of fetching the entire raster #931

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15 changes: 6 additions & 9 deletions common/src/main/java/org/apache/sedona/common/raster/PixelFunctions.java
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Original file line number Diff line number Diff line change
Expand Up @@ -18,15 +18,14 @@
*/
package org.apache.sedona.common.raster;

import org.geotools.coverage.grid.GridCoordinates2D;
import org.geotools.coverage.grid.GridCoverage2D;
import org.geotools.coverage.grid.GridGeometry2D;
import org.geotools.geometry.DirectPosition2D;
import org.locationtech.jts.geom.Geometry;
import org.locationtech.jts.geom.Point;
import org.opengis.coverage.PointOutsideCoverageException;
import org.opengis.geometry.DirectPosition;
import org.opengis.referencing.operation.TransformException;

import java.awt.image.Raster;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
Expand All @@ -47,8 +46,6 @@ public static List<Double> values(GridCoverage2D rasterGeom, List<Geometry> geom
// Invalid band index. Return nulls.
return geometries.stream().map(geom -> (Double) null).collect(Collectors.toList());
}
Raster raster = rasterGeom.getRenderedImage().getData();
GridGeometry2D gridGeometry = rasterGeom.getGridGeometry();
double[] noDataValues = rasterGeom.getSampleDimension(band - 1).getNoDataValues();
DoublePredicate isNoData = d -> noDataValues != null && DoubleStream.of(noDataValues).anyMatch(noDataValue -> Double.compare(noDataValue, d) == 0);
double[] pixelBuffer = new double[numBands];
Expand All @@ -59,16 +56,16 @@ public static List<Double> values(GridCoverage2D rasterGeom, List<Geometry> geom
result.add(null);
} else {
Point point = ensurePoint(geom);
DirectPosition2D directPosition2D = new DirectPosition2D(point.getX(), point.getY());
GridCoordinates2D gridCoordinates2D = gridGeometry.worldToGrid(directPosition2D);
DirectPosition directPosition2D = new DirectPosition2D(point.getX(), point.getY());
try {
double pixel = raster.getPixel(gridCoordinates2D.x, gridCoordinates2D.y, pixelBuffer)[band - 1];
rasterGeom.evaluate(directPosition2D, pixelBuffer);
double pixel = pixelBuffer[band - 1];
if (isNoData.test(pixel)) {
result.add(null);
} else {
result.add(pixel);
}
} catch (ArrayIndexOutOfBoundsException exc) {
} catch (PointOutsideCoverageException | ArrayIndexOutOfBoundsException exc) {
// Points outside the extent should return null
result.add(null);
}
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