Carlos, This is a specialized case. You can do this programatically by using 'derived bands' in the VRT format[1].
It could be a lot easier to do this using a desktop GIS application like QuantamGIS [2]. QuantamGIS has a raster calculator utility that can do a lot of arithmetic operations like this. [1]: http://www.gdal.org/gdal_vrttut.html [2]: http://www.qgis.org/ On Sat, Dec 10, 2011 at 5:15 AM, SupportLists <[email protected]>wrote: > Hi, > > I need to perform classification and combination of three ascii grids. > This means for example: > > 1. Separate the data of each cell in the grid among three classes > Layer1 Classes: A1,B1,C1 > Layer2 Classes: A2,B2,C2 > Layer3 Classes: A3,B3,C3 > > 2. Then Combine the three classified grids into one so each cell has a > combination of the 27 possible. > Cell 1: A1A2A3 > Cell 2: A1B2A3 > .... > Cell max: C3C2C1. > > 3. Assign a color to each combination and generate a final GeoTIFF. > > How if possible can I do this with GDAL? > > Many thanks, > Carlos. > > ______________________________**_________________ > gdal-dev mailing list > [email protected] > http://lists.osgeo.org/**mailman/listinfo/gdal-dev<http://lists.osgeo.org/mailman/listinfo/gdal-dev> > -- Best regards, Chaitanya kumar CH. +91-9494447584 17.2416N 80.1426E
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