Le dimanche 01 mars 2015 10:17:34, Andrea Peri a écrit : > Hi, > we have a set of tiffs georef with 4th bands of color RGB and Infrared. > We need to activate a wms with the color from the NDVI index > > NDVI = Normalized Difference Vegetation Index > > NIR - RED > NDVI = ------------- > NIR + RED > > > Where NIR is the 4th band, > RED s the 1th band. > > We prefer dont' do a physical float raster, but retrieve this realtime from > the original tiffs. > > I try to reproduce this index NDVI using to a LUT table in MapServer, > but without any success. > There is some other solution to obtain this on mapserver.
Andrea, It turns out that the same question was asked more than 10 years ago : http://lists.osgeo.org/pipermail/mapserver-users/2004-July/053754.html Since them, GDAL has the VRT format. With derived bands (described near the end of http://gdal.org/gdal_vrttut.html), you could do that but that requires writing a custom function in C, which isn't very convenient for integration with MapServer. It would be nice to add the capability of writing pixel functions in Python. Even -- Spatialys - Geospatial professional services http://www.spatialys.com _______________________________________________ mapserver-users mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/mapserver-users
