PostGIS

PostGIS supports all spatial data types including: POINT, LINESTRING, POLYGON, MULTIPOINT, MULTILINESTRING, MULTIPOLYGON, and GEOMETRYCOLLECTION )Wait. PostGIS supports all object representation methods, such as WKT and WKB.

PostGIS supports all data access and construction methods, such as GeomFromText(), AsBinary(), and GeometryN().

PostGIS provides simple spatial analysis functions (such as Area and Length) and other functions with complex analysis functions, such as Distance.

PostGIS provides support for metadata, such as GEOMETRY_COLUMNS and SPATIAL_REF_SYS, and PostGIS also provides corresponding support functions, such as AddGeometryColumn and DropGeometryColumn.

PostGIS provides a series of binary predicates (such as Contains, Within, Overlaps, and Touches) for detecting spatial relationships between spatial objects, and returns Boolean values ​​to characterize objects that conform to this relationship.

PostGIS provides spatial operators (such as Union and Difference) for spatial data manipulation. For example, the Union operator blends the boundaries between polygons. Two overlapping polygons will form a new polygon through the Union operation, and the boundary of this new polygon is the largest boundary of the two polygons.