I'm not sure but if you just display your raster without any styling i think MapSever would show it in grayscale.
I'm new with MapServer so i'm feeling a bit insolent posting a reply :) El 28 de septiembre de 2011 11:30, Jorge Arévalo < [email protected]> escribió: > 2011/9/28 Jorge Arévalo <[email protected]>: > > I'm serving a NDVI coverage via Mapserver. So, one band, float32 > > values, [-1.0, 1.0]. I want to display the NDVI in greyscale, and > > generate a legend. I've tried 2 things: > > > > - Create two dummy classes, just for testing: > > > > CLASS > > NAME "rojo" > > EXPRESSION ([pixel] < 0.3) > > STYLE > > COLOR 255 0 0 > > END > > END > > > > CLASS > > NAME "azul" > > EXPRESSION ([pixel] >= 0.3) > > STYLE > > COLOR 0 0 255 > > END > > END > > > > So, my legend looks like this: > http://dl.dropbox.com/u/6599273/leyenda.png > > > > And the image, obviously, is red and blue: > > http://dl.dropbox.com/u/6599273/capturas/ndvi_en_gvsig.png > > > > But I'd like to see the image in greyscale... The I've tried the next > thing > > > > - Pre-classify values with PROCESSING "SCALE=-1.0, 1.0". I don't know > > what Mapserver internally does with this processing order, but I can > > see the image in greyscale: > > http://dl.dropbox.com/u/6599273/capturas/ndvi_gris_en_gvsig.png > > > > The problem is now I can't see any legend, because I've not created > > any class. I'd like to see all the different levels of the grayscale > > image in my legend. > > > > How could I do it? > > > > Many thanks in advance > > > > -- > > Jorge Arévalo > > Internet & Mobility Division, DEIMOS > > [email protected] > > http://es.linkedin.com/in/jorgearevalo80 > > http://mobility.grupodeimos.com/ > > http://gis4free.wordpress.com > > http://geohash.org/ezjqgrgzz0g > > > > Ok, I've found a way, but I'm sure it isn't the shortest path. > > Basically, I've generated a legend using GRASS (r.colors to add grey > color as color interpretation for band and d.legend to generate the > legend). The legend is generated from the ndvi file. So, I guess I can > create a HTML template as Mapserver legend, using the legend generated > by grass (here: > http://dl.dropbox.com/u/6599273/grass/grass_legend.png) > > On the other hand, I know how to generate a legend in Mapserver using > CLASS objects in the mapfile, but I don't know how to generate that > legend without the CLASS options in the mapfile. > > Am I taking the long way on this? Is there an easier way to generate a > legend for a NDVI file in Mapserver? > > Many thanks in advance > > -- > Jorge Arévalo > Internet & Mobility Division, DEIMOS > [email protected] > http://es.linkedin.com/in/jorgearevalo80 > http://mobility.grupodeimos.com/ > http://gis4free.wordpress.com > http://geohash.org/ezjqgrgzz0g > _______________________________________________ > mapserver-users mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/mapserver-users >
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