Field Station Setup Properties

A Field Station Setup is used when you have setup the theodolite on a field station and have taken some observations. There are certain data items for the station setup which are recorded and are used during the reduction to compute the XYZ values for the observed points.

Setup Station Name
Enter the name of the setup station.

Height of Instrument
The height of instrument is used to compute the XYZ values for the points observed from this station. If left blank, the XY values can be computed for the points, but no height can be calculated.

Azimuth Swing
The Azimuth Swing is the correction angle which is to be added to each observation bearing to correct it. If not known, leave this field blank and you can use the first observation to another know station to automatically compute the Azimuth swing.

Optionally enter a remark for this station setup.

Zenith Angle
This sets the orientation of the vertical angle system. Normally 0 degrees is straight up (default). If your theodolite is different, enter the angle for straight up. If left blank, it will be assumed to be 0 degrees.

Vertical Circle Correction
This sets the vertical circle correction. Depending on the instrument, then can be a few minutes. This correction will be added to every vertical angle used when reducing points.

There are three ways to set the Azimuth Swing for a station setup.
1. On the station setup, enter the desired Azimuth Swing. If this value is entered, it will always be used.
2. If this Station setup Azimuth swing value is blank, the reduction will attempt to establish the Azimuth swing by looking at the first observation from the station, and if it is to an 'Observed Station', for which it already has co-ordinates, it can compute the Azimuth swing.
3. The first observation to an 'observed station' may consist of a horizontal bearing value only. This is enough information to compute the Azimuth Swing for the station setup. This observation will not be used as a standard observation if it does not have enough data to compute the target point.