PostGIS空间数据中基础常用函数介绍

int4" AS '$libdir/postgis-3', 'LWGEOM_get_srid' LANGUAGE c IMMUTABLE STRICT COST 1 在调用函数时仅需要传入空间数据就可以 text" AS '$libdir/postgis-3', 'LWGEOM_asEWKT' LANGUAGE c IMMUTABLE STRICT COST 500在上面的空间表中进行查询验证。 float8" AS '$libdir/postgis-3', 'ST_Area' LANGUAGE c IMMUTABLE STRICT COST 50select st_area(geom::geography