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

[Sebastian P. Luque]

Corrado,
What v.in.region does is create a vector that surrounds your current
region. Then, when you run v.proj, the vector covering the region is
brought to your target location so you know where your projected
raster should be at...

The "manual labor" after that is setting the resolution correctly. You
could then use some rule of thumb like 3arcsec ~= 90 m or, try to set
the number of columns/rows in your target region similar to your
lat/lon region. But this latter option does not work so well if your
raster is to be tilted a lot...

On an "additional" question: How do people set the resolution
correctly when transforming from lat/lon to meter and vice-versa? Are
there any other methods besides the ones I mentioned?

Cheers
Daniel

On Thu, Oct 23, 2008 at 8:16 AM, Nikos Alexandris
<nikos.alexandris at felis.uni-freiburg.de> wrote:
> On Thu, 2008-10-23 at 10:40 +0100, Corrado wrote:
>> 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

> [...]

> Hi Corrado!

> For sure!! You can use v.in.region anytime since it deals with the
> current region and not with a specific map.

> Regards, Nikos





Cheers,

-- 
Sebastian P. Luque
Department of Biology
Memorial University
St. John's, NL A1C 3X9
Canada
http://sebmags.homelinux.org/~sluque

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