<br><div class="gmail_quote">On Mon, Apr 5, 2010 at 2:20 PM, William Kyngesburye <span dir="ltr"><<a href="mailto:woklist@kyngchaos.com">woklist@kyngchaos.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
I thinking of creating a vrt for approx 19000 geotiff DEM tiles (SRTM). Any comments on the performance or practicality of this? Is there a difference in performance between Geotiff and GRASS as the tile format?<br>
<br>
Mainly it's so I can easily extract regions for projects, so it would be one-shot gdal_translate runs.<br><br></blockquote><div><br>I've done something similar. <br><br>Check out the SourceProperties tag in
<a href="http://www.gdal.org/gdal_vrttut.html">http://www.gdal.org/gdal_vrttut.html</a>. If you specify that for each source image, then GDAL doesn't have to open all 19000 images at runtime. The performance is quite good. <br>
<br>--Matt<br></div></div>