[GRASS-user] generate a grid with sequential numbers

[Moritz Lennert]

On 17/09/12 21:32, Markus Neteler wrote:
> Here you go - see screenshot:
>
> # get rows and cols as environment variables
> eval `g.region -g`
> r.mapcalc "grid_seq = col() * $rows + row() + $cols - ($rows + $cols)"

This can be simplified to

r.mapcalc "grid_seq = col() * $rows + row() - $rows"

and gives you a "vertical" sequence.

My solution

r.mapcalc "grid_seq = row() * $cols + col() - $cols"

gives you a "horizontal" sequence.

I added a FAQ at http://grass.osgeo.org/wiki/Sequential_Grid.

Moritz