I have a raster table and a geometry table in postgis. My goal is to create a single raster merging elements from both:-

WITH geom_raster AS (

    SELECT wkb_geometry, ST_AsRaster(wkb_geometry, 200,200,ARRAY['8BUI', '8BUI', '8BUI'], ARRAY[118,154,118], ARRAY[0,0,0]) as rast FROM geometry_table
raster AS (

    SELECT ST_Union(rast) from raster_table,geom_raster where wkb_geomtry && rast
   SELECT ............

What is the last step to merge the two into a single raster so I see the geometry on top of the raster? I tried ST_Union but get an error about alignment which I suspect means the grids or SRIDS or something else are not in unison?

1 Answer 1


Answer was staring me in the face after a more detailed read of documentation:-

SELECT ST_AsRaster(ST_Buffer(wkb_geometry, 50), 
          as rast FROM  raster,geometry_table

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