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<DIV><FONT size=2>For those interested tiling,</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2> There is similar tiling related discussion/work
going on at:</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2> <A
href="http://lists.eogeo.org/mailman/listinfo/tiling"><FONT
size=3>http://lists.eogeo.org/mailman/listinfo/tiling</FONT></A> (do they
have a web page?)</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2> and </FONT></DIV>
<DIV><FONT size=2> <A
href="http://www.stereofx.org/terrain.html">http://www.stereofx.org/terrain.html</A>,
implemented in <A href="http://vterrain.org/">http://vterrain.org/</A>,
particularly VTBuilder (<A
href="http://vterrain.org/Doc/VTBuilder/overview.html">http://vterrain.org/Doc/VTBuilder/overview.html</A>)</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>Brent Fraser</FONT></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=jordi@geoquadtree.org href="mailto:jordi@geoquadtree.org">Jordi
Gilabert Vall</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=gdal-dev@lists.maptools.org
href="mailto:gdal-dev@lists.maptools.org">gdal-dev@lists.maptools.org</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Tuesday, November 14, 2006 3:25
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [Gdal-dev] GeoQuadTree - an open
format for storing georeferencedimages</DIV>
<DIV><BR></DIV>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
onclick="return top.js.OpenExtLink(window,event,this)"
href="http://geoquadtree.org/" target=_blank>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>
<P>
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