Geographic functions ​

Geographic functions work with coordinate pairs and typed coordinate collections. Use a consistent coordinate system for each calculation.

Function families ​

• Geographic distances measures a spherical arc from longitude/latitude coordinates and returns metres.
• Geometry construction creates Point, Ring, Polygon and related aliases with validated nesting.
• Point in polygon tests containment with defined outer-boundary and hole rules.

The geometry aliases do not assign a coordinate reference system or validate polygon topology. See geometry types for shapes and GeoJSON for importing and exporting features.