[Gdal-dev] GeoQuadTree - an open format for storing georeferencedimages

[Brent Fraser]

For those interested tiling,

  There is similar tiling related discussion/work going on at:

        http://lists.eogeo.org/mailman/listinfo/tiling (do they have a web page?)

    and 
            http://www.stereofx.org/terrain.html, implemented in http://vterrain.org/, particularly VTBuilder (http://vterrain.org/Doc/VTBuilder/overview.html)

Brent Fraser
  ----- Original Message ----- 
  From: Jordi Gilabert Vall 
  To: gdal-dev at lists.maptools.org 
  Sent: Tuesday, November 14, 2006 3:25 AM
  Subject: [Gdal-dev] GeoQuadTree - an open format for storing georeferencedimages


  Hi,

  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. 
  You can find more information on the project web site:

  http://geoquadtree.org/ 

  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).


  I think it's a useful format, open, very easy to use, and very efficient (in terms of response time).

  Do you think it could be useful for you ? Would you like to include it on GDAL's next release ?

  jordi at geoquadtree org



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