Raster colorizer example #1
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- This code was possible thanks to a pairing session with @dlebrero - We found that there is no need to convert the raster to Byte type if we use the band number in the datasouce configuration https://github.com/mapnik/mapnik/wiki/PgRaster band - integer - request for a specific raster band index (1-based). 0 means to read all bands. Note that a band read from a single band raster gets interpreted as Grayscale if band=0 is specified while they retain their original value when explicitly referenced with the "band" parameter. This affects effectiveness of RasterColorizer: https://github.com/mapnik/mapnik/wiki/RasterColorizer - We still need to test if the same behavior applies to a raster that has been reprojected to Web mercator (EPSG:3857) with gdalwarp - We're using `pgraster` plugin. We need to double if this is the same plugin used in Windshaft or if it is `postgis`
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