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Determine Coordinate System - General
Transformation Characteristic
Requirements
Area
Advantage
Disadvantage
Description
•
The positions and heights are known in
WGS 1984 and in the local system for at least
three points. Four points or more are recom-
mended in order to obtain higher redundancy.
•
Parameters of the local ellipsoid.
•
Parameters of the local map projection in order to
convert between grid coordinates and geodetic
coordinates.
•
Parameters of the local geoid model in order to
convert between orthometric and ellipsoidal
heights. This is not compulsory.
Especially wide networks with large height differ-
ences. Local grid coordinates must be accurate.
•
Accuracy of the measurements is maintained.
•
It may be used over any area as long as the local
coordinates, including heights, are accurate.
•
The local ellipsoid and map projection must be
known for the local grid coordinates.
•
In order to obtain accurate ellipsoidal heights the
geoid separation at the measured points must be
known. This may be determined from a geoid
model. Refer to "13.2 Terminology".
GPS1200+
934
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