SEVENPAR (English) 1.10
SPATIAL HELMERT TRANSFORMATION
The program produces a set with seven parameters of the sapatial Helmert transformation valid for an specific area, with which then arbitrary coordinates of the area can be transformed from one reference system into another with high accuracy. The seven transformation parameters are computed with a set of individual identical points. Those are points with known coordinates in both reference systems. For the computation at least three identical points must be present. In practice you will be anxious to use more identical points than those three necessities. The program supports upto 10.000 identical points. Cartesian coordinates or geographical coordinates with 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-axis are available in the program for the selection from lists. There are altogether to determine seven parameters, i.e. three translations, three rotations and a scale constant. The parameters are calculated by the compensation according to the method of the smallest squares (L2 norm, Helmert transformation). Therefore must be dissolved a formula system with seven equations and seven unknown quantities. The coordinates of the identical points are tested intensively on outliers and deviations by different statistic procedures. The quality of the computed seven parameters of the Helmert transformation is documented by a residual matrix and by the computation of the middle, maximum and root mean square (RMS) deviations. The seven parameters are presented in the three most usual standards. Those are the Coordinate Frame Rotation, the Position Vector Transformation and the European Standard ISO 19111.
What is new in 1.10 software version? - Program with new CHM help system runable on WINDOWS 7. Maximal number of identical points increased to 10.000. Substantial more calculation speed by new, in C++ programmed GeoDLL. Supports Terminal Services on WINDOWS Servers (Citrix Terminal Server).. What is expected in the future? Newly-made SEVENPAR (English) 1.11 be downloaded from current page, we also looking forward to unconfirmed 1.12 release build. You may download sevenpar.zip directly, estimated download time by ISDN or CDMA [~128 kbit/s] is 0:01:45. Just write the reviews of the SEVENPAR (English). System requirements are 500 MHz, 128 MB Memory, 50 MB HD. Program has been scanned and verified by the several antivirus and anti-spyware applications and SEVENPAR (English) found to be clean. The following languages are supported by SEVENPAR (English): English, German.
