Hi - I'm very interested in using GeoTools HeatmapProcess to handle
raster data from Apache Solr Cloud. So far I've been able to generate
views from the raster data using a GridCoverage2D, but when I try to
apply the heat map process, I get an empty frame. Any tips?
Thank you!
-Joe
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/**
* Create a new coverage from the given data array. All non-zero array
* values are written to the coverage as 1; zero values as 0.
*/
public GridCoverage2D makeBinaryCoverage(int[][] data) {
GridCoverageFactory gcf
= CoverageFactoryFinder.getGridCoverageFactory(null);
// Assume data array is in row-major order
final int dataW = data[0].length;
final int dataH = data.length;
final int imgTileW = 128;
// image tile sample model
SampleModel sm = new ComponentSampleModel(DataBuffer.TYPE_BYTE,
imgTileW, imgTileW, 1, imgTileW, new int[]{0});
ColorModel cm = TiledImage.createColorModel(sm);
TiledImage img = new TiledImage(0, 0, dataW, dataH, 0, 0, sm, cm);
System.out.println("DataH: "+dataH+" dataW: "+dataW);
for (int y = 0; y < dataH; y++) {
for (int x = 0; x < dataW; x++) {
if (data[y][x] != 0) {
img.setSample(x, y, 0, data[y][x]);
}
}
}
// Set world coords as 1:1 with image coords for this example
ReferencedEnvelope env = new ReferencedEnvelope(
new Rectangle2D.Double(0, 0, dataW, dataH),
DefaultEngineeringCRS.CARTESIAN_2D);
return gcf.create("HeatMap", img, env);
}
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