[mapserver-users] 16 Bit PNG Output

2011-04-07 Thread kaipi 
I am not able to output elevation data as 16 Bit PNGs. Is Mapserver not able
to to this ?
I tried with a current version of Mapserver on Windows and on Linux. I tried
WMS and WCS requests - but I always get 8 Bit PNGs back although I have
configured 16INT. Other formats like GTiff or Esri Bil work fine with 16Int.

Any ideas ? 

Thanks,

kaipi

Here is my mapfile:

  [...]

  OUTPUTFORMAT
   NAME 'tif'
   DRIVER GDAL/GTIFF
   IMAGEMODE INT16  
   MIMETYPE "image/tif"
  END
  
  OUTPUTFORMAT
   NAME 'pngint16'
   DRIVER GDAL/PNG
   IMAGEMODE INT16  
   MIMETYPE "image/pngint16"
  END

  [...]

LAYER
NAME "SRTM30"
PROJECTION
  "init=epsg:4326"
END

DUMP TRUE 
METADATA
"wcs_rangeset_name"   "Range 1"   ### required to support
DescribeCoverage request
"wcs_rangeset_label"  "My Label"  ### required to support
DescribeCoverage request
"wcs_label" "SRTM WCS TIF Server"
"ows_extent" "-180 -90 180 90"
"wcs_resolution" "0.0083 -0.0083"
"ows_srs" "EPSG:4326"
END 

STATUS default
TYPE RASTER
DATA "S:\dem\srtm\srtm30\SRTM30_16b_BIL_GM.TIF"



CLASS
END
  END
 

  [...]


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Re: [mapserver-users] 16 Bit PNG Output

2011-04-08 Thread Frank Warmerdam 

On 11-04-07 08:19 AM, kaipi wrote:

I am not able to output elevation data as 16 Bit PNGs. Is Mapserver not able
to to this ?
I tried with a current version of Mapserver on Windows and on Linux. I tried
WMS and WCS requests - but I always get 8 Bit PNGs back although I have
configured 16INT. Other formats like GTiff or Esri Bil work fine with 16Int.

Any ideas ?

Thanks,

kaipi

Here is my mapfile:

   [...]

   OUTPUTFORMAT
NAME 'tif'
DRIVER GDAL/GTIFF
IMAGEMODE INT16
MIMETYPE "image/tif"
   END

   OUTPUTFORMAT
NAME 'pngint16'
DRIVER GDAL/PNG
IMAGEMODE INT16
MIMETYPE "image/pngint16"
   END


Harry,

I suspect the problem is that the PNG driver supposed unsigned 16bit
integer while IMAGEMODE INT16 is signed 16bit integers.  We really need
a FORMATOPTION that will let us force the pixel data type of the generated
file even if it is somewhat different from the IMAGEMODE type.  Perhaps you
could create an enhancement ticket for this and ensure it is assigned to me
(userid: warmerdam)?

It should be a pretty easy change.

Best regards,
--
---+--
I set the clouds in motion - turn up   | Frank Warmerdam, warmer...@pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush| Geospatial Programmer for Rent

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