[GRASS-user] Row and Column from Geogr. Coords.

GRASS GRASS user
1

Dear folk,

I am working with a map in UTM coords. and I need, given a pair lat/lon, to extract the row and column corresponding to that cell. I am thinking on using r.stats and the utility proj to interpolate in the map but, is there any other easier way to do it? Is maybe possible to do it directly with GRASS?

Thanks in advance

José A. Ruiz

2

José Antonio Ruiz Arias wrote:

I am working with a map in UTM coords. and I need, given a pair
lat/lon, to extract the row and column corresponding to that cell. I
am thinking on using r.stats and the utility proj to interpolate in
the map but, is there any other easier way to do it? Is maybe possible
to do it directly with GRASS?

m.proj + r.what?

The Python SWIG interface could do it well using GRASS library
functions.

"row and column corresponding to that cell" is a bit undefined in GRASS
as the working region is not tied to the underlying raster data. Do you
want row,cell referenced to the original raster map bounds?

coord of south west corner of map and resoution from r.info gives you
all you need to calc cell coords forwards & back.

Hamish