PostGIS Cookbook - Second Edition

Converting between rasters and geometries

In the last recipe, we used the geometries to filter and clip rasters only to the areas of interest. The ST_Clip() and ST_Intersects() functions implicitly converted the geometry before relating it to the raster.

PostGIS provides several functions for converting rasters to geometries. Depending on the function, a pixel can be returned as an area or a point.

PostGIS provides one function for converting geometries to rasters.