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Determine Coordinate System - General
Transformation Characteristic
Requirements
Area
Description
A site where the coordinates of the control points are
based on a purely local grid. The coordinate values
within this grid are totally arbitrary and are in no way
connected with any ellipsoid or map projection. Obvi-
ously a Classic 3D transformation cannot be used
here, as cartesian coordinates cannot be calculated
from such a grid.
•
The position is known in WGS 1984 and in the
local system for at least one point. Three or more
points are recommended in order to obtain
redundancy.
•
Additional height information for one point
enables the transformation of heights.
•
Parameters of the local geoid model. This is not
compulsory.
•
No parameters of the local ellipsoid.
•
No parameters of the local map projection.
•
Limited to about 10 x 10 km because no projec-
tion scale factor is applied and a standard Trans-
verse Mercator projection is used to compute the
preliminary WGS 1984 grid coordinates.
•
For areas without large height differences.
GPS1200+
936
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