[GRASS-user] Merge images

Monica wrote:

I have 2 landsat scenes acquired one after the other and I wanted
to merge them. How can I do that?

if they follow in time, but cover the same place, use
  g.region rast=map1 ; r.series in=map1,map2 out=maps12 method=...

if they follow in space, but from the same time, use
  g.region rast=map1,map2 ; r.patch in=map1,map2 out=maps12

Hamish