Geographic Information Systems Stack Exchange
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PostGIS Online Tutorials: Learn spatial SQL
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UC Davis Soil Resource Laboratory
The UCDavis Soil Resource Laboratory reference site provides useful tutorials on using open source GIS tools such as GRASS, PostGIS, GDAL, OGR, KaMap, R statistical package, QGIS and UMN Mapserver and applying these tools for use in scientific research. A larger body of this work is written by Dylan Beaudette.
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Mass GIS Tutorial Wiki
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PostGIS Wiki
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Paolo Corti Blog
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SpatialDB Advisor
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