[geotk] Looking for Java APIs to create a PNG from a double[][]

[Robert Nix]

Hi,

As a newbie to GIS, i'm looking for information on how to use GeoTools (or any appropriate) APIs to convert a double[][] into a PNG.

According to the manual technique using AWT i was trying (below), it seems i need a raster then saving it as a PNG but i'm hoping there's a more straightforward way using GeoTools APIs (and APIS that actually work for me :)

BTW, as i understand it, i'm generating tiles to be served (layered?) by GeoServer. If there's a better method/format, i'm open to that.

Thanks for any pointers you can provide,
Robert


      DataBufferDouble db = new DataBufferDouble(d, d[0].length);
      SampleModel sm = new PixelInterleavedSampleModel(DataBuffer.TYPE_DOUBLE,
        w, h, 4, w * 4, new int[]{2, 1, 0, 3});
      ColorModel cm = new ComponentColorModel(ColorSpace.getInstance(
        ColorSpace.CS_LINEAR_RGB), true, true, ColorModel.TRANSLUCENT,
        DataBuffer.TYPE_DOUBLE);
      WritableRaster wr = WritableRaster.createWritableRaster(sm, db, null);
      BufferedImage bi = new BufferedImage(cm, wr, true, new Hashtable<>());
      File outputfile = new File("saved.png");
      ImageIO.write(bi, "png", outputfile);

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