[GRASS-user] Retrieve pixel position

[Nikos Alexandris]

On Tuesday 03 of August 2010 19:11:27 Nikos Alexandris wrote:
> (forgot to cc to the list)
> 
> António:
> > Thanls for the tip. But isn't there any other more "interactive" way
> > (like r.what?)
> 
> I thought you have a points vector map and want to retrieve row,col for
> each point. Maybe "d.what.rast -c" is what you are looking for then?

In case I did think correctly that you want to script something, I think 
"r.stats -x" is the only way to get specific row,cols. I don't know any other 
module that will report rows and cols.

So, given that your points of interest are a vector map, then something like 
"v.to.rast" + "r.mapcalc ( to create a MASK)" + "r.stats -xg over the MASK", 
would give you coordinates and rowcol for _all_ non-NULL pixels in the MASK.

If you loop this (using "for") over your points of interest, will return for 
each point the requested values.

Hope this helps, Nikos