Or maybe you could use the r.patch command to combine them into one raster with one colortable.<br><br><div class="gmail_quote">On Mon, Jun 4, 2012 at 3:36 PM, Helmut Kudrnovsky <span dir="ltr"><<a href="mailto:hellik@web.de" target="_blank">hellik@web.de</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="im">>One of my aims is to take a nice grayscale image to use in deforming mesh<br>
topology.  The circuit straddles >two tiles and the shading is markedly<br>
different.<br>
><br>
>How can I either fix one or re-color both from scratch based on the<br>
elevation data?<br>
<br>
</div>maybe build a virtual gdal data set [1] [2] of the Aster dem tiles, link [3]<br>
or import [4] them and use these tiles as one dem dataset for shading?<br>
<br>
[1] <a href="http://www.gdal.org/gdalbuildvrt.html" target="_blank">http://www.gdal.org/gdalbuildvrt.html</a><br>
[2] <a href="http://www.gdal.org/gdal_vrttut.html" target="_blank">http://www.gdal.org/gdal_vrttut.html</a><br>
[3] <a href="http://grass.osgeo.org/grass64/manuals/html64_user/r.external.html" target="_blank">http://grass.osgeo.org/grass64/manuals/html64_user/r.external.html</a><br>
[4] <a href="http://grass.osgeo.org/grass64/manuals/html64_user/r.in.gdal.html" target="_blank">http://grass.osgeo.org/grass64/manuals/html64_user/r.in.gdal.html</a><br>
<br>
-----<br>
best regards<br>
Helmut<br>
--<br>
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