[GRASSLIST:2468] Re: native resolution of raster maps

[Scott Mitchell]

Presuming I'm understanding the question right, what you're looking for 
is just:
g.region rast=nameofexistingmap

to make the current region match that of the existing map.

But that's only part of the question, because it sounds like you're 
mixing things with different spatial units?  Or maybe you mean that the 
resolution _corresponds_ to 10m resolution but is actually in lat/long 
coordinates/units?

Scott Mitchell

On Wednesday, Feb 4, 2004, at 21:24 Canada/Eastern, Jason Horn wrote:

> Is there a way to find out the native resolution of a raster map and 
> _set_it_ using g.region?
>
> I'm concerned about making sure that raster operations (such as 
> r.patch) occur at the native resolution of the maps involved, not the 
> resolution of the region.  The reason that this concerns me is that I 
> noticed that the grid resolution setting of g.region only goes down to 
> 1 sec (in a lat-lon location).  If I calculate correctly, that's about 
> 30m.  What if I have data that have, say, a 10m resolution?  Can I not 
> perform operations on those data at their native resolution because 
> g.region won't let me set the resolution low enough?  For maps that 
> have a resolution higher than 30m, how do I set the resolution in 
> g.region to exactly match the native resolution of the map.  Right 
> now, I'm guessing and I'm afraid that I'm loosing data.
>
> As always, thanks ahead of time,
>
> Jason
> Jason Horn
> Boston University Department of Biology
> 5 Cumington Street  Boston, MA 02891
>
> jhorn at bu.edu
> 617 353 6975
>
------
Scott W. Mitchell		Scott_Mitchell at carleton.ca
Department of Geography and Environmental Studies
Carleton University, B349 Loeb Building
Ottawa, ON Canada
+1-613-520-2600 ext 2695