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

GRASS GRASS user
1

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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2

Take a loot to r.statistics:
http://grass.osgeo.org/grass64/manuals/html64_user/r.statistics.html

2008/7/14 Christian Schwartze <Christian.Schwartze@uni-jena.de>:

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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