Leica GPS1200 Series Technical Reference Manual page 922

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Determine Coordinate System - General

Transformation Characteristic

Requirements

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

Additional height information for one point

enables the transformation of heights.

Parameters of the local geoid model. This is not

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.

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