Hello, I'm using Mapserver to output PNG 16-bits DEM raster from .HGT elevation data. I'm using the below output format definition :
OUTPUTFORMAT NAME PNG16 DRIVER GDAL/PNG MIMETYPE image/png IMAGEMODE INT16 EXTENSION "png" END However I keep on getting the standard PNG 8-bits out of mapserver. The strange thing being that when I use a similar config to get GeoTiff 16-bits, I do get what I'm asking for : OUTPUTFORMAT NAME GEOTIFF16 DRIVER GDAL/GTiff MIMETYPE image/tiff IMAGEMODE INT16 EXTENSION "tiff" END Could that be an issue with the GDAL/PNG driver ? It seems that the GDAL/PNG driver supports only CreateCopy() and not Create(), where the GDAL/GTiff driver supports both ... Could that be it ? I suspect the GDAL/PNG driver so I also sent my issue to the GDAL mailing list. I can see from the mailing list that other users already had a similar issue, but there is no obvious reason or solution provided. https://lists.osgeo.org/pipermail/mapserver-users/2011-April/068428.html https://lists.osgeo.org/pipermail/mapserver-users/2012-January/071310.html For information, I'm using GDAL v2.1.3 and Mapserver v7.0.1 Thanks, Johannes
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