Leica Captivate, Техническое справочное руководство

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Transformation Characteristic Description
Requirements
•
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.
Area
•
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.
Points and trans-
formation param-
eters
The transformation parameters
determined depend on the number
of available points with position
information.
•
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.
Points and height
transformation
The type of height transformation
performed depends on the number
of available points with height infor-
mation.
•
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.
1056 Glossary