[GRASS-user] Grass module to use to create a bounding box

GRASS GRASS user
1

Hi List
I have a raster and a vector layer but would want to limit the
analysis to the bounding box of the vector layer - how do I accomplish
this.
Is there a vector module to create a vector bounding box (v.*).
Thanks

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Sent from my mobile device

Sindile Bidla

2

You should be able to set the region to the vector layer and then your
set. You plan to do the analysis on the raster, correct?

John

On 2/23/09, Intengu Technologies <sindile.bidla@gmail.com> wrote:

Hi List
I have a raster and a vector layer but would want to limit the
analysis to the bounding box of the vector layer - how do I accomplish
this.
Is there a vector module to create a vector bounding box (v.*).
Thanks

--
Sent from my mobile device

Sindile Bidla
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--
John C. Tull, Ph.D.
Conservation Director
Nevada Wilderness Project
8550 White Fir Street
Reno, NV 89523
775.746.7851 (office)
775.224.2947 (mobile)
www.wildnevada.org

3

Yes analysis on the raster - how do I do that John as I have a region
defined already, which is larger than the extent of the vector.

On 2/24/09, John C. Tull <john.tull@wildnevada.org> wrote:

You should be able to set the region to the vector layer and then your
set. You plan to do the analysis on the raster, correct?

John

On 2/23/09, Intengu Technologies <sindile.bidla@gmail.com> wrote:

Hi List
I have a raster and a vector layer but would want to limit the
analysis to the bounding box of the vector layer - how do I accomplish
this.
Is there a vector module to create a vector bounding box (v.*).
Thanks

--
Sent from my mobile device

Sindile Bidla
_______________________________________________
grass-user mailing list
grass-user@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/grass-user

--
--
John C. Tull, Ph.D.
Conservation Director
Nevada Wilderness Project
8550 White Fir Street
Reno, NV 89523
775.746.7851 (office)
775.224.2947 (mobile)
www.wildnevada.org

--
Sent from my mobile device

Sindile Bidla

4

Intengu Technologies wrote:

Yes analysis on the raster - how do I do that John as I have a region
defined already, which is larger than the extent of the vector.

# set to raster map to obtain raster's resolution
g.region rast=raster_map

# set bounds to match vector map and expand bounds to current resolution.
g.region vect=vector_map -ap

I am not sure if -a works properly if you do not also use res=. So maybe
set res= by hand in the second step to match what r.info says, and make sure
it has aligned cleanly.

maybe this way:
g.region vect=vector_map
g.region align=raster_map

?
Hamish