[mapserver-users] Mapfile classifying using two separate raster files?

[Lars Schylberg]

I would try to do a VRT file that describes both raster files and work 
with that.

I don't have an good example but maybe this could get You started 
together with the GDAL docs.

http://www.paolocorti.net/2012/03/08/gdal_virtual_formats/

/Lars S.

Matt McClelland skrev den 2015-07-23 08:54:
> Hi
>
> I have two raster files one for vegetation and one for population density.
> The two rasters (tif's) are at different scales
>
> I am using value based classification to paint the map green where 
> vegetation values are high.
> Is there a way I can classify based on values from the two separate 
> files in the same layer
> I can't see how this will  work as you can only have one data item per 
> layer?? (but worth asking)
>
> I am wanting to be able to do something like
> EXPRESSION ([veg] <= 50 and [population] > 500)
>
> The only option I can think of is to make the two files into a single 
> multiband tiff?  This seems wasteful as one is much lower resolution 
> then the other.
>
> thoughts??
>
> thanks
>
> Matt  :)
>
>
>
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