Hi Johannes,
I just wanted to mention that what I always test OUTPUTFORMAT with is
through the shp2img commandline utility, with the "-i" switch, such as:
shp2img -m test.map -o ttt.png -i PNG16 -all_debug 5
PS. in the future MapServer v8.0 I hope to help change that utility name
to "map2img", so it makes more sense.
-jeff
--
Jeff McKenna
MapServer Consulting and Training Services
https://gatewaygeomatics.com/
On 2020-02-05 6:02 a.m., Johannes Paul wrote:
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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