[GRASS-user] r.mapcalc: compare two maps

[Sören Gebbert]

The difference is computed for each pixel.
Just visualize the new map "mapdiff" of run r.univar mapdiff.

2017-03-28 22:23 GMT+02:00 Rich Shepard <rshepard at appl-ecosys.com>:
>   I want to compare two raster maps for any differences. The r.mapcalc
> expression I used yielde no results ... unless getting the GRASS shell
> prompt means there are no differences.
>
>   Command and result:
>>
>> r.mapcalc "mapdiff = blocked_culvert - open_culvert"
>>
>
>   No differences? Wrong syntax?
>
> TIA,
>
> Rich
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