MySQL Manual
11 Spatial Extensions in MySQL
- 11.2 The OpenGIS Geometry Model
- 11.2.1 The Geometry Class Hierarchy
- 11.2.2 Class
Geometry - 11.2.4 Class
Point - 11.2.7 Class
Curve - 11.2.9 Class
LineString - 11.2.12 Class
Surface - 11.2.14 Class
Polygon - 11.2.17 Class
GeometryCollection - 11.2.18 Class
MultiPoint - 11.2.21 Class
MultiCurve - 11.2.23 Class
MultiLineString - 11.2.25 Class
MultiSurface - 11.2.27 Class
MultiPolygon
11.2.21 Class MultiCurve
A MultiCurve is a geometry collection composed of
Curve elements. MultiCurve is a non-instantiable class.
11.2.22 MultiCurve Properties
-
MultiCurveis defined as a one-dimensional geometry. -
A
MultiCurveis simple if and only if all of its elements are simple, the only intersections between any two elements occur at points that are on the boundaries of both elements. -
The boundary of a
MultiCurveis obtained by applying the ``mod 2 union rule'' (also known as the odd-even rule): A point is in the boundary of aMultiCurveif it is in the boundaries of an odd number ofMultiCurveelements. -
A
MultiCurveis closed if all of its elements are closed. -
The boundary of a closed
MultiCurveis always empty.
