[Gdal-dev] GeoQuadTree - an open format for storing georeferenced images

Matt Wilkie matt.wilkie at gov.yk.ca
Tue Nov 14 14:29:18 EST 2006

Hi Jordi, geoquadtree sounds interesting. I've been wondering about 
something similar myself (as an end user, I can't program my way out of 
a wet paper bag) as I've been trying to efficiently use OnEarth imagery 
and elevation data over a large area (c.f. earlier msg re how to "for 
each poly do X").

My only question at this point, until a binary is available for me to 
play with, is how are you retaining georeferencing? PNG does not allow 
for it. Does this mean the only way to access the proper position for 
any given tile will be through the geoquadtree driver?

While I've long been a png afficionado, for spatial data I much prefer 
geotiff because the referencing can never be orphaned by simply 
forgetting to copy it along with the image file itself.


matt wilkie
Geographic Information,
Information Management and Technology,
Yukon Department of Environment
10 Burns Road * Whitehorse, Yukon * Y1A 4Y9
867-667-8133 Tel * 867-393-7003 Fax

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