[GRASS-dev] convert to utm projection

GRASS GRASS developer
1

How to convert a map in lat/long projection to UTM projection using grass gis?

–
Rashad

2

Hi Rashad,
You will have to create a new location for the same extent as your data in lat/long but this time specify the projection for the location as UTM. Then make this new location and mapset your working grass space. Now use v.proj OR r.proj to pull in the file from the lat/long location and mapset to the new location you just created. This should change the projection from lat/long to UTM.

Cheers,
Varun

On Thu, Jul 8, 2010 at 12:32 PM, Mohammed Rashad <rashadkm@yahoo.com> wrote:

How to convert a map in lat/long projection to UTM projection using grass gis?

–
Rashad

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

3

Hi,

Complementing Varun response, take a look at the r.proj manual page
http://grass.ibiblio.org/grass65/manuals/html65_user/r.proj.html

Specially the Notes part, were it explains about the v.in.region trick
in order to set the region extent and resolution correctly

Cheers
Daniel

On Thu, Jul 8, 2010 at 4:02 AM, Mohammed Rashad <rashadkm@yahoo.com> wrote:

How to convert a map in lat/long projection to UTM projection using grass
gis?

--
Rashad

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

4

Daniel wrote:

Complementing Varun response, take a look at the r.proj manual page
http://grass.ibiblio.org/grass65/manuals/html65_user/r.proj.html

Specially the Notes part, were it explains about the v.in.region trick
in order to set the region extent and resolution correctly

fyi in grass 6.5 and newer there is also the r.proj -p and -g flags which
make the v.in.region trick not really needed any more.

Hamish

5

I was not aware of the -p and -g flags
Nicer and nicer every time....

On Thu, Jul 8, 2010 at 9:43 PM, Hamish <hamish_b@yahoo.com> wrote:

Daniel wrote:

Complementing Varun response, take a look at the r.proj manual page
http://grass.ibiblio.org/grass65/manuals/html65_user/r.proj.html

Specially the Notes part, were it explains about the v.in.region trick
in order to set the region extent and resolution correctly

fyi in grass 6.5 and newer there is also the r.proj -p and -g flags which
make the v.in.region trick not really needed any more.

Hamish