Leica GPS1200 Series Technical Reference Manual page 919

Determine Coordinate System - General
Transformation parameters
A transformation consists of a number of shifts, rotations and scale factors, depending on the
type of transformation used. Not all of these parameters are always required. These param-
eters may already be known, or may need to be computed.
Description of transformations
Three different transformations are provided:
• Classic 3D, also called Helmert transformation
• Onestep
• Twostep
Transformation Characteristic
Classic 3D Principle
Positions and
heights
Use
Description
Transforms coordinates from WGS 1984 cartesian
to local cartesian coordinates and vice versa. A map
projection can then be applied to obtain grid coordi-
nates. As a similarity transformation, it is the most
rigorous transformation type and keeps the full
geometrical information.
Positions and heights are linked. The accuracy is
fully maintained and does not distort the measure-
ments.
When measurements are to be kept totally homoge-
nous.
GPS1200 919