Yves thanks a lot for the help.
So it is sufficient to add SetEnv GDAL_DRIVER_PATH ..., place the file with the pixel function there, and Mapserver can find pixel function referenced in the VRT file? What kind of compilation did you use? Create a shared library *.so or is the *.o object file sufficient? Armin -------- Original-Nachricht -------- > Datum: Thu, 16 Feb 2012 09:31:11 +0100 > Von: Yves Jacolin <[email protected]> > An: [email protected], [email protected] > Betreff: Re: [gdal-dev] Using VRT images with derived bands (pixel function) > with MapServer > Armin, > > I am using such application stack: netcdf > vrt and pixel functions > GDAL > > > MapServer > > We have a tiled layer inside PostGIS and we juste configure the layer like > all > other tiled datasource: > > LAYER > STATUS ON > NAME "layer_idx" > TYPE POLYGON > CONNECTION "dbname=mydb host=localhost user=myUser password=mypassword" > CONNECTIONTYPE postgis > DATA "the_geom FROM myLayer USING srid=4326" > PROJECTION > "init=epsg:4326" > END > METADATA > "wms_srs" "EPSG:4326" > "wms_timeextent" "2010-12-20/2010-12-26" > "wms_timeitem" "datetime" #column in postgis table of type timestamp > "wms_timedefault" "2010-12-24T00:00:00Z" > "wms_enable_request" "*" > END > END > > If you want to use the vrt file directly it is also possible as easily as: > DATA "vrt/myLayer.vrt" > > About register the plugin, in Apache config you have to use SetEnv this > way: > SetEnv GDAL_DRIVER_PATH directory/mapserver/misc > SetEnv MS_MAPFILE directory/mapserver/mymapfile.map > SetEnv MS_MAPFILE_PATTERN "^directory/mapserver/mymapfile.map" > > Hth, > > Y. > > Le Mercredi 15 Février 2012 19:52:21 Armin Burger a écrit : > > Dear all > > > > I would be interested in using VRT images with "derived bands" as > > described on the VRT image documentation page. This requires the > > definition of a pixel function and the registration of this function in > > the used application via "GDALAddDerivedBandPixelFunc". > > > > The provided sample function is already towards what I'm looking for. I > > would just need to adapt it accordingly (calculating band 1 as > > combination of source band 1 and 3). > > > > Since my main interest is to use such image definition in the context of > > Mapserver, my question is if there could be a way to use this also from > > Mapserver as application? If yes, where would I need to register the > > function and how would I best make the function available to Mapserver > > (maybe via an .o file that is created when compiling)? Maybe somewhere > > inside mapgdal.c ? > > > > Would such a pixel function be used also in case when not the full > > resolution image (i.e. TIFF file referenced in the VRT file) is read but > > one of the overviews from the .ovr file associated to the Tiff file? > > > > Thanks in advance for any hints > > > > Armin > > _______________________________________________ > > gdal-dev mailing list > > [email protected] > > http://lists.osgeo.org/mailman/listinfo/gdal-dev > -- > Yves Jacolin > > http://yjacolin.gloobe.org -- Empfehlen Sie GMX DSL Ihren Freunden und Bekannten und wir belohnen Sie mit bis zu 50,- Euro! https://freundschaftswerbung.gmx.de _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
