[GRASS-dev] g.region zoom?

[Moritz Lennert]

On 11/05/15 23:48, Anna Petrášová wrote:
>
>
> On Mon, May 11, 2015 at 5:01 PM, Paulo van Breugel
> <p.vanbreugel at gmail.com <mailto:p.vanbreugel at gmail.com>> wrote:
>
>
>
>     On Mon, May 11, 2015 at 5:58 PM, Anna Petrášová
>     <kratochanna at gmail.com <mailto:kratochanna at gmail.com>> wrote:
>
>         Hi,
>
>         I just realized how g.region zoom actually works and I am
>         wondering if it is supposed to be obvious. I always thought it
>         will set the region to the raster map minimum bounding box, but
>         it takes current region and only shrinks it. The behavior is
>         written in the manual (I eventually realized), but it doesn't
>         strike me as particularly useful.
>
>
>     What for example if you want to restrict calculations to the region
>     defined by the non-null values of a particular map that has a
>     different resolution than the maps you are using in your calculations?
>
>
> I am not concerned with resolution but extent. I was mostly confused
> from the case when I have region smaller than the extent of the raster
> (from previous computation) and then I expected g.region zoom  to set
> the region on the whole raster extent, but instead it shrinks even more
> if there are nulls or it stays the same. So the result of the g.region
> zoom depends on you previous region settings which was unexpected for me.
>
>
>
>         At least I would suggest to change the g.region zoom behavior in
>         the GUI -> right click on layer -> Set computational region from
>         selected map (ignore NULLS) to:
>
>         g.region raster=map zoom=map
>
>
>     That does indeed seems the more obvious / intuitive behaviour to me
>
>
>
> I will do that, thanks!

I'm always tempted to actually propose to remove that option totally 
from the right-click menu as I find that it often confuses users (maybe 
the description is not clear enough), but I agree that if we want to 
leave it, then your version sounds more intuitive.

Moritz