MySQL 5.1 Reference Manual :: 11 Functions and Operators :: 11.13 Spatial Extensions :: 11.13.2 The OpenGIS Geometry Model :: 11.13.2.3 Class Point
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- 11.13.2 The OpenGIS Geometry Model
- 11.13.2.1 The Geometry Class Hierarchy
- 11.13.2.2 Class Geometry
- 11.13.2.3 Class Point
- 11.13.2.4 Class Curve
- 11.13.2.5 Class LineString
- 11.13.2.6 Class Surface
- 11.13.2.7 Class Polygon
- 11.13.2.8 Class GeometryCollection
- 11.13.2.9 Class MultiPoint
- 11.13.2.10 Class MultiCurve
- 11.13.2.11 Class MultiLineString
- 11.13.2.12 Class MultiSurface
- 11.13.2.13 Class MultiPolygon
A Point is a geometry that represents a
single location in coordinate space.
Point
Examples
Imagine a large-scale map of the world with many cities. A
Pointobject could represent each city.On a city map, a
Pointobject could represent a bus stop.
Point
Properties
X-coordinate value.
Y-coordinate value.
Pointis defined as a zero-dimensional geometry.The boundary of a
Pointis the empty set.
User Comments
One small correction, a world map as indicated in the first example is a small-scale map. Remember a map's scale (map units/realworld units) is a dimensionless ratio. As the area shown on a map increases the real world units number increases (map units number is allways one) and the ratio gets smaller. The general rule of thumb to keep in mind is that a small-scale map covers a large area and a large-scale map covers a small area.
The second example would be a large-scale map.
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