Hi Ram,
the DEM-service we provide, uses the classic mechanism with pixel value and
expression. The response-times with nearly fullscreen WMS (Format PNG8 or JPEG)
are < 1s; there are also some image manipulations done which cost some
additional time (BILINEAR-Resampling, COMPOSITE-Features for combination with
hillshade, etc.). So in summary mapserver performs generally very well with
such raster-data...
MAPFILE-Snippet (Classification from 0 - 500m) :
CLASSITEM "pixel"
CLASS
EXPRESSION ([pixel] >= 0 AND [pixel] < 100)
STYLE
COLORRANGE 108 163 99 165 186 111
DATARANGE 0 100
RANGEITEM "pixel"
END
END
CLASS
EXPRESSION ([pixel] >= 100 AND [pixel] < 200)
STYLE
COLORRANGE 165 186 111 231 213 122
DATARANGE 100 200
RANGEITEM "pixel"
END
END
CLASS
EXPRESSION ([pixel] >= 200 AND [pixel] < 300)
STYLE
COLORRANGE 231 213 122 199 167 92
DATARANGE 200 300
RANGEITEM "pixel"
END
END
CLASS
EXPRESSION ([pixel] >= 300 AND [pixel] < 400)
STYLE
COLORRANGE 199 167 92 176 120 58
DATARANGE 300 400
RANGEITEM "pixel"
END
END
CLASS
EXPRESSION ([pixel] >= 400 AND [pixel] < 500)
STYLE
COLORRANGE 176 120 58 215 127 63
DATARANGE 400 500
RANGEITEM "pixel"
END
END
Maybe your data could be optimized, if you are not satisfied with
response-times?
If I remember right, I used 32-bit grayscale GeoTIFF for DEM and Hillshade
(both with DEFLATE-Compression and internal TILING) and I also calculated
Overviews with gdaladdo for faster presentation in smaller scales...
Ben
-----Ursprüngliche Nachricht-----
Von: mapserver-users [mailto:[email protected]] Im
Auftrag von ramchandra
Gesendet: Dienstag, 25. Juli 2017 13:14
An: [email protected]
Betreff: [mapserver-users] Using OGL rendering instead of AGG
Hi All,
I am trying to color classify a DEM by adding multiple styles to the layer
entry in the map file using the PIXEL value as the EXPRESSION. I am trying to
speedup the rendering of the styled layer. I tried using the Hardware
accelerated rendering through OpenGL. I have added the cmake flags so that
OpenGL binaries are loaded when building Mapserver.
I also made changes in the source code to enable the OGL Rendering by setting
the MACRO #USE_OGL to 1. I have also changed my OUTPUTFORMAT as follows to
trigger opengl rendering.
OUTPUTFORMAT
NAME "OGL_PNG24"
DRIVER "OGL/PNG"
IMAGEMODE RGB
END # OUTPUTFORMAT
In-spite of doing all these when i am sending the request it appends a new
OUTPUTFORMAT object with AGG Driver as follows.
OUTPUTFORMAT
NAME "png"
MIMETYPE "image/png"
DRIVER "AGG/PNG"
EXTENSION "png"
IMAGEMODE RGB
TRANSPARENT FALSE
END # OUTPUTFORMAT
It also changes my OGL OUTPUTFORMAT by adding the additional fields MIMETYPE
and EXTENSION.
OUTPUTFORMAT
NAME "OGL_PNG24"
MIMETYPE "image/png; mode=24bit"
DRIVER "OGL/PNG"
EXTENSION "png"
IMAGEMODE RGB
TRANSPARENT FALSE
END # OUTPUTFORMAT
When I debug the code I see an error when the OGL output format block is parsed.
The error says "OGL_PNG24 driver is not configured".
Can anyone point out what might me causing this error or how to enable OpenGL
based rendering.
Regards,
Ram
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