Re: [GRASS-user] UTM location

[Micha Silver]

On 28/07/2010 11:48, Bulent Arikan wrote: Dear List, I have several ASTER GDEM (originally in Latlong, 30m res) images, which are reprojected into corresponding UTM locations. My research area covers two zones: UTM 37 and 38. Is there a way of creating a UTM location that can accept data from both zones? I think I saw a thread in recent list serve emails but I could not find it. I apologize if my question has recently been answered. I     You could reproject all the ASTER tiles into one UTM zone, but that would most likely be "wrong". That is, you'd be introducing distortion. The UTM projection works best only when you stay within 500 km. of the central meridian. If you want want to have all the data in one projection, best to choose some other suitable projection that covers the whole region with minimum distortion, such as LAEA (used by the European Environment Agency). As for your patching question, I'd say patch (using *r.patch* not r.series) in Lon/Lat WGS84, then reproject your patched raster to whatever projection you choose from above. No need for any resampling, etc.   -- BÜLENT  This mail was received via Mail-SeCure System. _______________________________________________ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user This mail was received via Mail-SeCure System. -- Micha Silver http://www.surfaces.co.il/ Arava Development Co. +972-52-3665918

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