On lundi 29 avril 2019 10:40:32 CEST Peter Schmitt wrote: > Hi, > > When my data is 4-band (BGRN), I use the BANDS processing directive to > yield RGB tiles, like so: > > PROCESSING "BANDS=4,3,2" > > Is there a way to have a single layer within a Mapfile that will set this > directive to 4,3,2 when the underlying data has four bands and either skip > the directive or set it to 1,2,3 when the underlying data is 3-band? > > The only thing I can think of is it to try runtime substitution, where my > request might include the band order like > "REQUEST=WMS&the_band_order=4,3,2&...." and then configure my mapfile > accordingly: > > PROCESSING "BANDS=%the_band_order%" > > Is there another way which doesn't require the client to know about the > underlying data? FWIW, my ultimate use-case serves mosaics using a tile > index generated from Postgis. The Postgis table could have a column storing > the band information, but I'm not sure how to extract that in my > LAYER/BANDS Processing directive.
Use a VRT that does the band reordering, and use it in your tile index. Even -- Spatialys - Geospatial professional services http://www.spatialys.com _______________________________________________ mapserver-users mailing list [email protected] https://lists.osgeo.org/mailman/listinfo/mapserver-users
