A good question and it doesn't seem to be clearly documented. I've always tried values listed at https://mapserver.org/el/input/raster.html#raster-query even though that section appears to be written for MapScript. Each band has a value based on index, so you should get results using "value_0", "value_1", and "value_2" in RANGEITEM. gdalinfo should peobably provide details on the value ranges in each band.
Seth -- web:https://geographika.net & https://mapserverstudio.net twitter: @geographika On Mon, Aug 28, 2023, at 2:50 PM, Trygve Aspenes via MapServer-users wrote: > Thanks Seth for your quick reply > > Yes I have multiple bands. gdalinfo tells me I have bands like this: > Band 1 Block=949x1069 Type=Float32, ColorInterp=Undefined > Band 2 Block=949x1069 Type=Float32, ColorInterp=Undefined > Band 3 Block=949x1069 Type=Float32, ColorInterp=Undefined > . > . > . > Band n Block=949x1069 Type=Float32, ColorInterp=Undefined > > So, how could I figure out how the various bands are named in mapserver > for the RANGEITEM? > > I have looked at the documentation for STYLE/RANGEITEM but I still don't > get it. > > I have tried various values for RANGEITEM ( like "value_0", "0", "1", > "pixel", "Band 1" etc), but I dont get it. > > It must be something that I'm missing. > > By the way, thanks for the mapserverstudio link. Most helpful! > Trygve Aspenes > > > Den 2023-08-28 13:14, skrev Seth G: >> Hi Trygve, >> >> You can have multiple start/stop values and your syntax looks correct. >> Maybe you have multiple bands in your raster and you are symbolising on >> the incorrect value? Try explicitly setting the RANGEITEM. >> >> See working example at https://app.mapserverstudio.net/#9JBVADFh >> >> CLASS >> NAME "colorramp" >> STYLE >> COLORRANGE "#e3edfc" "#287593" # a color gradient from >> light grey to a shade of blue >> # a pixel value of -20 will be light grey, and values >> from -20 to 0 will be >> # assigned a color from the colour gradient of light >> grey to blue >> DATARANGE -20 0 >> RANGEITEM "value_0" # this is the name of the value >> band in the raster, the datasets used in the Mapfile have a single band >> END >> STYLE >> COLORRANGE "#29497b" "#759387" >> DATARANGE 0 20 >> RANGEITEM "value_0" >> END >> STYLE >> COLORRANGE "#bfa96d" "#480d26" >> DATARANGE 20 50 >> RANGEITEM "value_0" >> END >> END >> >> Seth >> >> >> -- >> web:https://geographika.net & https://mapserverstudio.net >> twitter: @geographika >> >> On Mon, Aug 28, 2023, at 12:06 PM, Trygve Aspenes via MapServer-users >> wrote: >>> Hi all >>> >>> I'm looking into creating a styling for a raster of float32 data. >>> The data describes temperature in kelvin and I want to have a >>> colorrange >>> from blue to white for data up to 273 deg kelvin(0 deg C). And from >>> white to red for warmer data. >>> >>> I see here >>> https://mapserver.org/output/kerneldensity.html#raster-color-ramping >>> how >>> this is used for heatmap hoping that this will work for a raster also. >>> >>> I try with something like this: >>> >>> CLASS >>> STYLE >>> COLORRANGE "#0000ffff" "#ffffffff" >>> DATARANGE 200 273 >>> END # STYLE >>> STYLE >>> COLORRANGE "#ffffffff" "#ff0000ff" >>> DATARANGE 273 315 >>> END # STYLE >>> END # CLASS >>> >>> but as far as I can see this gives me only white. >>> >>> If I try to use one style like this: >>> >>> CLASS >>> STYLE >>> COLORRANGE "#0000ffff" "#ff0000ff" >>> DATARANGE 200 315 >>> END # STYLE >>> END # CLASS >>> >>> it works but the color range goes directly from red to blue. >>> >>> Am I doing something wrong or can I not use multiple stops for these >>> kind of data? >>> >>> Trygve Aspenes >>> _______________________________________________ >>> MapServer-users mailing list >>> [email protected] >>> https://lists.osgeo.org/mailman/listinfo/mapserver-users > _______________________________________________ > MapServer-users mailing list > [email protected] > https://lists.osgeo.org/mailman/listinfo/mapserver-users _______________________________________________ MapServer-users mailing list [email protected] https://lists.osgeo.org/mailman/listinfo/mapserver-users
