Hi,<br><font face="Arial, sans-serif"><font size="2"><br>Some
time ago I needed the retrieval from very large georeferenced raster
images in a OGC WMS server, and I wanted to avoid the use of tile
indexes or catalogues of images, neither a database. I started
thinking of an open format for storing arbitrarily large
georeferenced images. I named this format "GeoQuadTree", as it
would be based on a quadtree of rectangular tiles, each in PNG format
on the filesystem, in a simple hierarchical structure of folders. I
wrote a command line utility for creating it, importing from
PNG/JPEG/TIFF and exporting to PNG/JPEG/TIFF/GDAL. I also wrote a
GDAL driver for this format. I tested successfully with my own WMS
server software, and on MapServer compiled with GDAL support. It
worked very well on Blue Marble Next Generation at a resolution of 15
arc-seconds, i.e. 86400x43200 pixels.</font></font>
<p style="margin-bottom: 0cm;"><font face="Arial, sans-serif"><font size="2">You
can find more information on the project web site:</font></font></p>
<p style="margin-bottom: 0cm; margin-left: 40px;"><font face="Arial, sans-serif"><font size="2"><a href="http://geoquadtree.org/" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">http://geoquadtree.org/
</a></font></font></p>
<p style="margin-bottom: 0cm;"><font face="Arial, sans-serif"><font size="2">I'm
testing the release 1.0.0, you can test it on the subversion repository if you want (I haven't packaged it yet).<br></font></font></p>
<p style="margin-bottom: 0cm;"><font face="Arial, sans-serif"><font size="2">I
think it's a useful format, open, very easy to use, and very
efficient (in terms of response time).</font></font></p>
<p style="margin-bottom: 0cm;"><font face="Arial, sans-serif"><font size="2">Do
you think it could be useful for you ? Would you like to include it on GDAL's
next release ?</font></font></p><span class="sg">
<p style="margin-bottom: 0cm;"><font face="Arial, sans-serif"><font size="2">jordi at geoquadtree org</font></font></p></span>