[GRASS-user] patch a large number of tiles with rules

[Ivan Marchesini]

Hello,
for a study area we are working on, we have generated around 3000 tiles
partially overlapping each other by a constant amount of cells (on the
north, south, east and west sides).

We would like to patch this tiles in order to obtain a single layer but,
the general rule must be that, in the overlapping zone of two  tiles,
the minimum value of the two has to be chosen.

We have created a script that use r.mapcalc to sequentially patch each
tile to the previous ones, but, as you can imagine, it takes to much to
run...  

Any idea?

Many thanks

Ivan