Leica GPS900 Series, Technical Reference Manual

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Managing, Creating, Editing Coord Systems GPS900 54
4 Managing, Creating, Editing Coord Systems
4.1 Overview of Coordinate Systems
Description 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.
Elements of a
coordinate system The five elements which define a coordinate system are:
•
a transformation
• a projection
• an ellipsoid
• a geoid model
• a Country Specific Coordinate System model