Name
UpdateGeometrySRID — Updates the SRID of all features in a geometry column, and the table metadata.
Synopsis
text UpdateGeometrySRID(varchar table_name, varchar column_name, integer srid);
text UpdateGeometrySRID(varchar schema_name, varchar table_name, varchar column_name, integer srid);
text UpdateGeometrySRID(varchar catalog_name, varchar schema_name, varchar table_name, varchar column_name, integer srid);
Descrizione
Aggiorna lo SRID di tutti i record in una colonna geometry, aggiornando anche geometry_columns e il vincolo SRID della colonna. Usa la funzione current_schema() se lo schema non è passato come argomento.
Questa funzione supporta il 3d e non distrugge gli z-index.
Questo metodo supporta le Curve e le Circular String.
Esempi
Insert geometries into roads table with a SRID set already using EWKT format:
COPY roads (geom) FROM STDIN;
SRID=4326;LINESTRING(0 0, 10 10)
SRID=4326;LINESTRING(10 10, 15 0)
\.
This will change the srid of the roads table to 4326 from whatever it was before:
SELECT UpdateGeometrySRID('roads','geom',4326);The prior example is equivalent to this DDL statement:
ALTER TABLE roads
ALTER COLUMN geom TYPE geometry(MULTILINESTRING, 4326)
USING ST_SetSRID(geom,4326);If you got the projection wrong (or brought it in as unknown) in load and you wanted to transform to web mercator all in one shot you can do this with DDL but there is no equivalent PostGIS management function to do so in one go.
ALTER TABLE roads ALTER COLUMN geom TYPE geometry(MULTILINESTRING, 3857) USING ST_Transform(ST_SetSRID(geom,4326),3857) ;