Vincent,<br><br>The simplest way is to build the vrt using gdalbuildvrt with the option '-vrtnodata'. Any pixel with no data(including areas with no files) will have the value specified with that option. Refer to <a href="http://www.gdal.org/gdalbuildvrt.html">http://www.gdal.org/gdalbuildvrt.html</a><br>
<br><div class="gmail_quote">On Tue, Apr 27, 2010 at 6:24 PM, Vincent Honnet <span dir="ltr"><<a href="mailto:vincent.honnet@external.thalesgroup.com">vincent.honnet@external.thalesgroup.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Hi,<br>
<br>
I would like to do something like a picking on a vrt.<br>
Let me explain:<br>
I have vrt's from GTiff files but there is some holes, areas where there isn't any data.<br>
>From an area defined by its coordinates I would like to get the information if this area is pointing on a file or not, or at least on data or not.<br>
Is there a way to do that ? I'm using GDal 1.7.<br>
<br>
Thanks a lot in advance,<br>
<br>
Vincent<br>
<br>
<br>
_______________________________________________<br>
gdal-dev mailing list<br>
<a href="mailto:gdal-dev@lists.osgeo.org" target="_blank">gdal-dev@lists.osgeo.org</a><br>
<a href="http://lists.osgeo.org/mailman/listinfo/gdal-dev" target="_blank">http://lists.osgeo.org/mailman/listinfo/gdal-dev</a><br>
</blockquote></div><br><br clear="all"><br>-- <br>Best regards,<br>Chaitanya kumar CH.<br>/tʃaɪθənjə/ /kʊmɑr/ <br>+91-9848167848<br>17.2416N 80.1426E<br>