Updated RasterSymbolizer (markdown)
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<!-- Name: RasterSymbolizer -->
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<!-- Version: 19 -->
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<!-- Last-Modified: 2010/03/12 07:06:11 -->
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@ -15,11 +16,9 @@ The RasterSymbolizer is used to render an image from any [GDAL supported format]
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* This Symbolizer is often used with DEM (digital elevation model) data containing missing values (for example NASA SRTM DEM data); to achieve nice rendering, the [gdal_fillnodata.py](http://www.gdal.org/gdal_fillnodata.html) tool might be useful.
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* As of Mapnik 0.8 the RasterSymbolizer can be assigned a RasterColorizer to color a raw data raster according to a palette. This is useful for visualizing scientific data, dynamically changing the color gradient of a DEM, etc...
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* As of Mapnik 0.8 the RasterSymbolizer can be assigned a [[RasterColorizer]] to color a raw data raster according to a palette. This is useful for visualizing scientific data, dynamically changing the color gradient of a DEM, etc...
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
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
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
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
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Processed as described in http://wiki.openstreetmap.org/wiki/Hillshading_using_the_Alpha_Channel_of_an_Image
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