Hi John, In the similar lines as oracle GeoRaster, Xing Lin developed a raster model for PostGIS named PGRaster. Metadata is stored as fields of PGRASTER METADATA type with spatial extent (BBOX) and SRID. Raster value type refers to scale of measurement that can be nominal, ordinal, interval or ratio. The model coordinates have same unit as that of specified SRID. Actual image data is stored in PGRASTER object type with blocks. Geotiff2pgraster loader creates blocks, GIST index, and pyramid levels while importing the image into database. Some basic SQL functions to handle parameters of data model are provided; however, many functions for image manipulation are under development. The source code is distributed under the terms of GNU General Public Licence by Refractions Research Inc; however, there is a debate over Xing Lin's PGRaster source code and design regarding patent violation by Oracle. http://lists.refractions.net/pipermail/postgis-devel/attachments/20070711/b6dfd192/PGRASTER\_20070710-0001.pdf Regards, --Imran
________________________________ From: John Zhang <[EMAIL PROTECTED]> To: [email protected] Sent: Saturday, November 22, 2008 3:22:31 AM Subject: [postgis-users] PGRaster Hi there, Could anyone tell me about that? Is it implemented in postGIS 1.3? Having read some articles about GeoRatser from Oracle, I was wondering if PostGIS's PGRaster is there for us to use. Any input on it would be much appreciated. Have a good weekend John
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