plpygis_postgis_to_shapely_geometry_buffer_with_wkb_conversion.py

1import plpygis
2from shapely.geometry import Shape
3
4def buffer_geometry(geom_wkb, distance):
5    # Convert the PostGIS WKB geometry to a plpygis Geometry object
6    # and then to a Shapely geometry object
7    shape = plpygis.Geometry(geom_wkb).shapely
8    
9    # Use Shapely to create a buffer around the geometry
10    buffered_shape = shape.buffer(distance)
11    
12    # Convert the Shapely object back to a plpygis Geometry object 
13    # and return its WKB representation
14    return plpygis.Geometry.from_shapely(buffered_shape).wkb