[GRASS-user] r.mapcalc and producing a max value map

[Christian Schwartze]

Dear GRASS users,

could somebody help me to find some solution for the following task?
I have a raster map representing many distinct areas (MAP_1) and a second int
raster with specific values (MAP_2). The result map should contain the same
areas of MAP_1 but with the max MAP_2 value of each area as IDs. I tried some
approaches with r.mapcalc but I don't know how to code the region aspect of
MAP_1 into r.mapcalc.

        MAP_1           MAP_2           --->    MAP_MAX
        -----           -----                   -------

        1111333332      5266723974              7777999995
        1113333222      1429784155      --->    7779999555
        1113333322      4152763923              7779999955
        1111144442      4125718443              7777788885

Thanks a lot for any help!
Regards,
Christian.



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