new GeneralEnvelope(new double[] { -90, -180 },
new double[] { 90, 180 }));
surl = TestData.url(this, "1band_Float32_test2.sld");
stylereader = new SLDParser(sf, surl);
sld = stylereader.parseSLD();
// the RasterSymbolizer Helper
rsh = new RasterSymbolizerHelper(gc, null);
// build the RasterSymbolizer
rs_1 = extractRasterSymbolizer(sld);