- When you consider the complexities that Google must be facing with GE in trying to manage 256x256k tiles of imagery over the entire world, at multiple pyramid layers and with constant revision of imagery, you can soon see that a file based approach would lead to a major headache.
He he, I think I'd write that same sentence but substitute 'database approach' for 'file based approach'. I'd be pretty shocked if Google were using any kind of database for their tiles. They certainly aren't paying oracle or arcsde license fees. They could have a custom mysql solution, but I'd guess it's all on the Google File System: http://labs.google.com/papers/gfs.html
Also, I think it's still in pretty beta development, but Geomatys has been working on PostGRID - http://seagis.sourceforge.net/postgrid/index.html and http://www.foss4g2007.org/presentations/view.php?abstract_id=225 have some information. I believe is pretty attached to java, but I think does some of what you want, managing the metadata in the database. Though I could be wrong about if it's close to what you're thinking of, my understanding of the raster side of the fence has never been that strong.
best regards, Chris
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