Andreas, WKT Raster was designed for this sort of thing. Which OS are you on? There are precompiled binaries for Windows and Mac OSX compiled that should work for PostGIS 1.4-1.5 For upcoming PostGIS 2.0 (which is now in alphaish state) -- we have WKT Raster (in windows experimental) packaged as part of the download. Below are relevant links http://trac.osgeo.org/postgis/wiki/WKTRaster http://trac.osgeo.org/postgis/wiki/WKTRasterTutorial01 <http://www.postgis.org/download/windows/experimental.php> http://www.postgis.org/download/windows/experimental.php (windows binaries) http://www.kyngchaos.com/software/postgres (Mac binaries) <http://www.postgis.org/documentation/manual-svn/RT_FAQ.html> http://www.postgis.org/documentation/manual-svn/RT_FAQ.html (raster FAQ) <http://www.postgis.org/documentation/manual-svn/RT_reference.html> http://www.postgis.org/documentation/manual-svn/RT_reference.html (raster functions) We also have a chapter on it in our upcoming book (currently available in beta book form -- from Manning) - http://www.manning.com/obe/ http://www.postgis.us/chapter_13 Leo and Regina http://www.postgis.us
_____ From: [email protected] [mailto:[email protected]] On Behalf Of Andreas Forø Tollefsen Sent: Saturday, August 21, 2010 2:49 PM To: [email protected] Subject: [postgis-users] Raster to Polygon vector cell Hi. I have been searching for a way to join raster values to polygons. In my case there is only one raster value within each polygon, and I would like this value to be joined into a column in the polygon table. The process would in other GIS programs probably look like this: Raster Data -> Point Features -> Spatial Join to Polygons (with raster value as new column for each polygon). Any ideas how one would formulate this? Thanks. Andreas
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