A coordinate system is a framework for defining the relative
locations of things in a given area; for example, an area on the earth's
surface or the earth's surface as a whole.
DB2® Spatial Extender
supports the following types of coordinate systems to determine the
location of a geographic feature:
- Geographic coordinate system
- A geographic coordinate system is a reference system
that uses a three-dimensional spherical surface to determine locations
on the earth. Any location on earth can be referenced by a point with
latitude and longitude coordinates based on angular units of measure.
- Projected coordinate system
- A projected coordinate system is a flat, two-dimensional
representation of the earth. It uses rectilinear (Cartesian) coordinates
based on linear units of measure. It is based on a spherical (or spheroidal)
earth model, and its coordinates are related to geographic coordinates
by a projection transformation.
DB2 Version 10.1 for Linux, UNIX, and Windows