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On 28/07/2010 11:48, Bulent Arikan wrote:
<blockquote
cite="mid:AANLkTikQ33nwd7t0Lr2csXVxgTLvpWP9yxhSSZWuaz+V@mail.gmail.com"
type="cite">Dear List,
<div><br>
</div>
<div>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 <br
clear="all">
</div>
</blockquote>
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.<br>
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).<br>
<br>
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.<br>
<br>
<blockquote
cite="mid:AANLkTikQ33nwd7t0Lr2csXVxgTLvpWP9yxhSSZWuaz+V@mail.gmail.com"
type="cite">
<div><br>
-- <br>
BÜLENT <br>
</div>
<br>
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</blockquote>
<br>
<br>
<pre class="moz-signature" cols="62">--
Micha Silver
<a class="moz-txt-link-freetext" href="http://www.surfaces.co.il/">http://www.surfaces.co.il/</a>
Arava Development Co. +972-52-3665918
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