(mysql.info.gz) GIS class multipolygon
Info Catalog
(mysql.info.gz) GIS class multisurface
(mysql.info.gz) OpenGIS geometry model
18.2.13 Class `MultiPolygon'
----------------------------
A `MultiPolygon' is a `MultiSurface' object composed of `Polygon'
elements.
`MultiPolygon' Examples
.......................
* On a region map, a `MultiPolygon' could represent a system of
lakes.
`MultiPolygon' Assertions
.........................
* A `MultiPolygon' has no two `Polygon' elements with interiors that
intersect.
* A `MultiPolygon' has no two `Polygon' elements that cross
(crossing is also forbidden by the previous assertion), or that
touch at an infinite number of points.
* A `MultiPolygon' may not have cut lines, spikes, or punctures. A
`MultiPolygon' is a regular, closed point set.
* A `MultiPolygon' that has more than one `Polygon' has an interior
that is not connected. The number of connected components of the
interior of a `MultiPolygon' is equal to the number of `Polygon'
values in the `MultiPolygon'.
`MultiPolygon' Properties
.........................
* A `MultiPolygon' is a two-dimensional geometry.
* A `MultiPolygon' boundary is a set of closed curves (`LineString'
values) corresponding to the boundaries of its `Polygon' elements.
* Each `Curve' in the boundary of the `MultiPolygon' is in the
boundary of exactly one `Polygon' element.
* Every `Curve' in the boundary of an `Polygon' element is in the
boundary of the `MultiPolygon'.
Info Catalog
(mysql.info.gz) GIS class multisurface
(mysql.info.gz) OpenGIS geometry model
automatically generated byinfo2html