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Transformation
1056
Characteristic
Description
Requirements
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Area
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Points and trans-
The transformation parameters
formation param-
determined depend on the number
eters
of available points with position
information.
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Points and height
The type of height transformation
transformation
performed depends on the number
of available points with height infor-
mation.
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The position is known in
WGS 1984 and in the local sys-
tem for at least one point. Three
or more points are recommen-
ded to obtain redundancy.
Additional height information for
one point enables the transfor-
mation of heights.
Parameters of the local geoid
model. This information is not
compulsory.
No parameters of the local ellip-
soid.
No parameters of the local map
projection.
Limited to about 10 x 10 km as
no projection 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.
One point: Classic 2D with shift
in X and Y.
Two points: Classic 2D with shift
in X and Y, rotation about Z and
scale.
More than two points: Classic 2D
with shift in X and Y, rotation
about Z, scale and residuals.
No point: No height transforma-
tion.
One point: Heights are shifted to
fit to the height control point.
Two points: Average height shift
between the two height control
points.
Glossary
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