[GRASS-user] Help: Converting a raster map between locations (from wgs84 lat / long to UTM)

[Corrado]

Thanks Nikos, thanks Daniel!

Unfortunately, my map is a raster map, not a vector .... can I still use 
v.in.region and v.proj?

Thanks

On Wednesday 22 October 2008 18:27:23 Nikos Alexandris wrote:
> On Wed, 2008-10-22 at 15:24 -0200, Daniel Victoria wrote:
> > It's because your region in the target location is wrong.
> >
> > Here is a little trick:
> >
> > In your lat/lon location, after you set your region, run the command
> > v.in.region (check correct syntax). This will create a bounding box of
> > the region.
> >
> > Then, go to your target location (UTM) and use the command v.proj to
> > import the vector you just created.
> >
> > Now, set your region to the imported vector with g.region
> > vect=name_of_vector_here
> >
> > Finally, run r.proj!!
> >
> > The only problem at which I don't know any exact method is setting the
> > target resolution correctly... I know it's done with g.region res=XX
> > but, the conversion from lat/long to meters is not a straight one...
> >
> > Cheers
> > Daniel
> >
> > On Wed, Oct 22, 2008 at 2:44 PM, Corrado <ct529 at york.ac.uk> wrote:
> > > Dear friends,
> > >
> > > I am trying to convert a GTOPO30 DEM (raster) map (for UK) from lat /
> > > long wgs 84 to UTM for UK.
> > >
> > > I am running into rserious problems. I am using the procedure as
> > > described in the book open source gis a grass gis approach"
> > >
> > > 1) in the WGS84 lat long location (ukll) I resize the map using d.zoom
> > > 2) I save the new region as well as the new sub-raster (for scotland)
> > > 3) I open grass in the UTM location
> > > 4) I try to import using
> > >
> > > r.proj in=gtopo30_cs out=gtopo30_cs_utm location=ukll mapset=PERMANENT
> > > method=cubic --o
> > >
> > > All I can get is: ERROR: Input map is outside current region
> > >
> > > What am I doing wrong? I have tried so many different alternative
> > > solution.
> > >
> > > Best,
> > > --
> > > Corrado Topi
>
> OK, maybe your way is better Daniel :-)
>
> Greets, Nikos



-- 
Corrado Topi

Global Climate Change & Biodiversity Indicators
Area 18,Department of Biology
University of York, York, YO10 5YW, UK
Phone: + 44 (0) 1904 328645, E-mail: ct529 at york.ac.uk