SEVENPAR is a tool for the calculation of highly exact transformation
parameters for the Spatial Helmert and Molodensky Transformation, which
make possible precise coordinate transformations from one reference
system into another. The determined transformation parameters can be
entered directly into suitable transformation software, e.g. TRANSDAT
Coordinate Transformations, or into the calculation software of GPS
receivers to do exact coordinate transformations.
The seven or three transformation parameters are computed with a set of
individual identical points. Those are points with known coordinates in
both reference systems (geodetic datum). Cartesian coordinates,
geographical coordinates or UTM coordinates with or wihtout ellipsoidal
height using the ellipsoid dimensions are suitable. Identical measuring
points of higher order can be usually inquired or referred by the
official institutions for measurement. The necessary ellipsoid half-axes
and flattenings are available in the program for the selection from
lists.
The coordinates of the identical points are tested intensively on
outliers and deviations by different statistic procedures. The quality
of the computed parameters is documented by a residual matrix and by the
computation of the middle, maximum and root mean square (RMS)
deviations.
The seven parameters of the Spatial Helmert Transformation are
calculated in the three standards "Coordinate Frame Rotation", "Position
Vector Transformation" and "European Standard ISO 19111". The three
parameters for Molodenky parameter sets are calculated using the
"Standard Molodensky Transformation".
The program has a user-selectable multi language interface and comes
with extensive online help. The program can be run on most common
networks and it is possible to use Terminal Services on WINDOWS Servers.
In case of a network installation the clients are installed
automatically by the program.