raster overlay

Alberto:

The colors will change when adding layers together using r.mapclac. This
is because the values of each layer are added together (where they overlay)
and this results in new & different values. You are overlaying correctly.

Pat Luther

At 10:27 AM 12/3/96 +0000, you wrote:

Hello
I'd like to know how can I create a raster file by an overlay
between some other. I tried using r.mapcalc with "+" but the result had
changed colors.
Thanks for help
Alberto Giorgi

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