I went hunting down the change proposal and gt-coverage docs and could not
find much. I did find the following JAI-EXT tutorial <http://docs.geotools.org
jai-ext>(which is more a reference page then a step by step tutorial).
--
Jody Garnett
On 14 October 2015 at 18:26, Gabriella Turek <gabriella.tu...@niwa.co.nz>
wrote:
> Is there documentation I can read on this? I have started using it so I
> can get the correct min max
> values for ARCGrid raster is the presence of no data values.
> However, now all my styling is screwed up, and some other calculations.
> IN styling I was using the following code to take show an image with a
> white mostly transparent bg where there are no data values:
>
> public static Style createSingleBandBGRasterStyle(double min, double max,
> double opacity) {
>
>
> Color[] spectrum = getGBColorSpectrum(10);
>
> ColorMap colorMap = sf.createColorMap();
>
> StyleBuilder sb = new StyleBuilder(sf);
>
>
> // add -9999 as novalue first
>
> Expression whiteColorExpr = sb.colorExpression(Color.white);
>
> Expression novalExpr = sb.literalExpression(-9999.0);
>
> Expression zeroOpacityExpr = sb.literalExpression(0.4);
>
> ColorMapEntry novalueEntry = sf.createColorMapEntry();
>
> novalueEntry.setQuantity(novalExpr);
>
> novalueEntry.setColor(whiteColorExpr);
>
> novalueEntry.setOpacity(zeroOpacityExpr);
>
> colorMap.addColorMapEntry(novalueEntry);
>
>
> ColorMapEntry entry = sf.createColorMapEntry();
>
> Expression opacityExpr = sb.literalExpression(opacity);
>
> Expression fromColorExpr = sb.colorExpression(spectrum[0]);
>
> Expression fromExpr = sb.literalExpression(min);
>
> entry.setQuantity(fromExpr);
>
> entry.setColor(fromColorExpr);
>
>
> entry = sf.createColorMapEntry();
>
> Expression toColorExpr = sb.colorExpression(spectrum[9]);
>
> Expression toExpr = sb.literalExpression(max);
>
> entry.setQuantity(toExpr);
>
> entry.setColor(toColorExpr);
>
> entry.setOpacity(opacityExpr);
>
> colorMap.addColorMapEntry(entry);
>
>
> RasterSymbolizer symb = sf.createRasterSymbolizer();
>
> symb.setColorMap(colorMap);
>
> symb.setName(String.valueOf(min) + "-" + String.valueOf(max));
>
> return SLD.wrapSymbolizers(symb); //sb.createRule(symb);
>
> }
>
> But with the flag set to true my rasters render as a single color….. Humm.
> Which leads me to believe something gets also changed in the nature of the
> underling raster image.
> Some elucidation would be greatly welcomed.
> Gaby
>
>
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>
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>
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