<p>In my case, I got a VRT consisting of about 20 GeoTIFFs, where each tile has overviews in them.</p>
<p>I did write some sandbox code, and tried the gdalwarp tool. Both are equally slow.</p>
<p>There are earlier posts related to this aswell. </p>
<div class="gmail_quote">Den 13. apr. 2012 13:36 skrev "Even Rouault" <<a href="mailto:even.rouault@mines-paris.org">even.rouault@mines-paris.org</a>> følgende:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Selon Oyvind Idland <<a href="mailto:oyvind.idland@gmail.com">oyvind.idland@gmail.com</a>>:<br>
<br>
> I am currently using GDAL 1.8.0, and have found that reprojecting VRT<br>
> datasets can be incredibly<br>
> slow (several minutes in my case). I believe there are bugs/tickets related<br>
> to this issue.<br>
><br>
> I am only interested in reprojecting arbitrary datasets (or portions of it)<br>
> into a screen size window, on the fly.<br>
> What is the most optimal way of doing this ?<br>
><br>
> Should I read the desired window first, and then reproject it ?<br>
<br>
There are many potential causes that could explain an excessive slowness.<br>
Without precise facts, it is hard to tell which strategy could improve that.<br>
<br>
><br>
> - Oyvind<br>
><br>
<br>
<br>
</blockquote></div>