Managing, Creating, Editing Coord Systems; Overview Of Coordinate Systems - Leica GPS900 Series Technical Reference Manual

4
4.1
Description
Elements of a
coordinate system

Managing, Creating, Editing Coord Systems

Managing, Creating, Editing Coord Systems

Overview of Coordinate Systems

A coordinate system:
• consists of up to five elements.
• allows the conversion from WGS 1984 geodetic or cartesian coordinates to, local carte-
sian, geodetic or grid coordinates and back.
• can be attached to jobs.
• can be manually defined.
• can be computed in the field.
• can be downloaded to LGO.
• can be uploaded from LGO.
All GPS surveyed points are always stored as WGS 1984 geodetic coordinates regardless of
the coordinate system being used. Using a different coordinate system converts the coor-
dinates displayed on the screen, but does not convert and restore the coordinate values in
the database DB-X.
One coordinate system can be attached to a job at one time. This coordinate system remains
attached to the job unless it is changed.
The five elements which define a coordinate system are:
• a transformation
• a projection
• an ellipsoid
• a geoid model
• a Country Specific Coordinate System model
GPS900 54