[GRASS-user] patching dems together

[Hamish]

stephen wrote:
> r.info
....
> any ideas,

{
 g.region rast=yourmap
   +
 r.univar yourmap
 d.histogram yourmap
}

are other useful ways to see if there is really any data in the map,
even if the color map (r.colors) has somehow gone completely out of range
and 0-100% is all set to a single color.

unlike r.info which looks at the metadata, r.univar and r.stats etc look
at the current computational region, resampling if need be; reporting
all NULLs if the map is not in the current zoom.


Hamish