[GRASS-user] UTM concepts

Dylan Beaudette dylan.beaudette at gmail.com
Sun Oct 8 21:35:30 EDT 2006

On Sunday 08 October 2006 17:05, Seb wrote:
> Hi,
> I'm trying to learn GRASS a second time and find myself struggling again
> with the basic issue of defining a region.
> I have a series of data sources with varying projections and extents
> covering the region I'm interested in.  I would like to work on a UTM
> projection with WGS84 datum for all analyses of this region, so would have
> to reproject and clip the original data sources to this standard.
> Since the region of interest covers several UTM zones, I don't understand
> how I should define the region for this project.  For instance, If I
> choose the UTM zone corresponding to the center of the region I'm
> interested in, how does one specify the limits of the region, considering
> that the data will span several (4) UTM zones?
> I may not be strictly on-topic with this question, but hopefully someone
> can point me to some source of info for learning this from a GRASS user
> perspective.  Thanks in advance.
> Cheers,


I would recommend working with a different projection which can handle the 
large region. Some common ones which come to mind: albers conic equal area or 
lamber conformal conic.


Dylan Beaudette
Soils and Biogeochemistry Graduate Group
University of California at Davis

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