This job calculates the coordinates of the station where the directions or directions and distances to the known points were measured. If only the directions were measured, the coordinates of the station are calculated by backward intersection with leveling using the SSM; if only the lengths measured also, the program will calculate the coordinates using the Helmert transformation. In this case, you can view the resulting transformation key after pressing the button (Key)
After the calculation, the program will display the direction adjustments on the coordinate list, eventually, the program will also display the distances to the orientation directions.
![]() | Important |
---|---|
If for some points, both directions and lengths were measured, and for others only the directions, the program will calculate the missing lengths from the measured data and further use them for the actual calculation of the free station. If you don't want the program to calculate the missing lengths, you can turn off this feature in Settings->Calculations. The most correct way of calculation of such a free station is, from the mathematical point of view, calculation using the balancing of the non-uniform measurements based on the standard error of directions and lengths. This option is provided in the demo version of the module for balancing the plannimetric nets, which is a standard part of the GROMA system. This demo version allows exact balancing of the free station with an arbitrary number of orientations. To allow the calculation, all the orientations must have set the feature Permanently marked point and the recognized point the feature Free (demo version allows recognition of only two unknowns). |
The dialog window also allows the calculation of the so called radius bar with orientation on the recognized point ( on a free station the direction and length to one orientation point and only the direction to the second orientation point is measured). However, at certain coordinates ambiguity of the calculation occurs (the configuration has two solutions). In such a case, the program allows you to choose one of both possible solutions. The correct solution can also be chosen based on the check drawing.