4.5.4.
System
The coordinate system is selected via the menu item Initial
> System. A pull-down menu appears, from which an existing
system can be selected or a new system can be established by entering a new
number.
By clicking the button <Global>,
a globally defined system can be selected. The definition of the system is then
adopted in the project. A system can be globally defined by adopting the
information in Edit System dialog by means of the <Save> button.
After selecting or entering the system, the specifications of the system appear.
If a system is new and globally defined, the global settings are preset. A
defined global system in the file vpdefaul.cnf
cannot be altered in the Edit
System dialog. In
this dialog settings are made for the reductions. These reductions are applied
in the processing of measured values and in the conversion of distances and
areas from coordinates into ground height. The following settings are possible:
|
Scale |
Scale of the coordinate system. In a UTM system the scale factor must be given as 0.9996. |
|
GK-Red |
Switch for the Gauss-Krueger Reduction. The information required for the reduction is taken from the point database. The coordinates must therefore be entered with all the digits before the decimal. |
|
NN-Red |
Switch for the height reduction. |
|
NR-Red |
Switch for the slope reduction during the reduction of slope distance into horizontal distance. |
|
Earth radius |
Earth radius for the reductions in [km]. |
By clicking the button <Save>
the system settings can be saved globally. If the system is only to be used
within the current project, use the <OK>
button. This button should also be used when you switch between individual
coordinate systems.