code: def rasterToWKB(cls, rasterPath, srid, noData, raster2pgsql):
          
          raster2pgsqlProcess = subprocess.Popen([raster2pgsql,
                                                  '-s', srid,
                                                  '-N', noData,
                                                  rasterPath,
                                                  'n_a'],stdout=subprocess.PIPE)
  
          # This commandline tool generates the SQL to load the raster into the database
          # However, we want to use SQLAlchemy to load the values into the database.
          # We do this by extracting the value from the sql that is generated.
          sql, error = raster2pgsqlProcess.communicate()
          if sql:
              # This esoteric line is used to extract only the value of the raster (which is stored as a Well Know Binary string)
              # Example of Output:
              # BEGIN;
              # INSERT INTO "idx_index_maps" ("rast") VALUES ('0100...56C096CE87'::raster);
              # END;
              # The WKB is wrapped in single quotes. Splitting on single quotes isolates it as the
              # second item in the resulting list.
              wellKnownBinary = sql.split("'")[1]
          else:
              print(error)
              raise
          return wellKnownBinary
docs: Accepts a raster file and converts it to Well Known Binary text using the raster2pgsql
          executable that comes with PostGIS. This is the format that rasters are stored in a
          PostGIS database.