Thanks for the response. Now, I'm sure I must generate the legend based on the classification specified in the mapfile or generate it by myself and manually include it in a template. Good to know it.
2011/9/29 Steve Lime <sdl...@gmail.com>: > Unfortunately MapServer isn't bright enough to generate a legend > solely from an image itself. The legend code > just wasn't built for such a task.Sorry... Steve > > 2011/9/28 Jorge Arévalo <jorge.arev...@deimos-space.com>: >> 2011/9/28 Jorge Arévalo <jorge.arev...@deimos-space.com>: >>> 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 >>> jorge.arev...@deimos-space.com >>> 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 >> jorge.arev...@deimos-space.com >> http://es.linkedin.com/in/jorgearevalo80 >> http://mobility.grupodeimos.com/ >> http://gis4free.wordpress.com >> http://geohash.org/ezjqgrgzz0g >> _______________________________________________ >> mapserver-users mailing list >> mapserver-users@lists.osgeo.org >> http://lists.osgeo.org/mailman/listinfo/mapserver-users >> > -- Jorge Arévalo Internet & Mobility Division, DEIMOS jorge.arev...@deimos-space.com http://es.linkedin.com/in/jorgearevalo80 http://mobility.grupodeimos.com/ http://gis4free.wordpress.com http://geohash.org/ezjqgrgzz0g _______________________________________________ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
