Simple Features

Simple Features are an OpenGIS standard which specifies digital storage of geographical data (point, line, polygon, multi-point, multi-line, etc) with both spatial and non-spatial attributes. Simple Features are based on 2D geometry with linear interpolation between vertices. In general, a 2D geometry is simple if it contains no self-intersection. The OpenGIS Simple Features specifications define various spatial operators, which can be used to generate new geometries from existing geometries.

Contents 1 Types 1.1 Point 1.2 LineString 1.3 Polygon 1.4 Multipoint 1.5 Multipolygon 1.6 GeomCollection 2 External links

Types

Point

Example: POINT (10 10)

LineString

Example: LINESTRING( 10 10, 20 20, 30 40)

Polygon

Example: POLYGON ((10 10, 10 20, 20 20, 20 15, 10 10))

Multipoint

Example: MULTIPOINT(10 10, 20 20)

Multipolygon

Example: MULTIPOLYGON(((10 10, 10 20, 20 20, 20 15, 10 10)),((60 60, 70 70, 80 60, 60 60)))

GeomCollection

Example: GEOMETRYCOLLECTION(POINT (10 10), POINT(30 30), LINESTRING(15 15, 20 20))

External links

• OpenGIS Specifications (Standards)
• OpenGIS Simple Features Specification for CORBA (99-054)
• OpenGIS Simple Features Specification for OLE/COM (99-050)
• OpenGIS Simple Features Specification for SQL (99-054, 05-134, 06-104r3)
• OGR - OGR library which implements relevant OGC standards
• OpenGIS Simple Features Specifications For SQL
• MySQL 5.1 documentation on Spatial extensions
• PostGIS Simple Features implementation for PostgreSQL