Terrestrial Engine PP - Rules and requirements

Site setup and backsight points

Trimble 4D Control Server expects total station measurements from surveys that have been prepared according to the standard described in the Trimble Survey Controller software documentation, for example. For monitoring purposes, Trimble 4D Control Server additionally expects the measurement to obey the following conventions:

• The total station itself can be positioned either on a point with control coordinates (setup types: Station setup, Station setup plus,) or on a point without control coordinates (setup types Resection), provided enough backsight points have been measured for the setup type.
• A Refline site setup (that is, the orientation to an unknown baseline) is not recommended.
• Each round measurement includes targeting at least one (setup type: Station setup) or two backsight points (setup types: Station setup plus, Resection) with known coordinates in a local grid. Known coordinates must be provided in the JobXML file. However, you can edit the coordinates later.
• Measurements of all backsight points that have been measured in the first round must be repeated with every following round.
• However, the total station can be located on different points in following rounds.
• Each backsight station measurement must contain measurements in both faces.

Target points

From the known coordinates of the backsight point and the measurements of the targets Terrestrial Engine PP computes approximate coordinates that are used by the adjustment functionality of the Integrity Monitor module to establish points in the global point list. Trimble 4D Control Server requires the following for monitoring:

• A point to be monitored must always have been stored in the JobXML file with the same point name.
• Each target point measurement must contain measurements in both faces. If it is not measured in both faces, the point is not respected for this round.
• The mean of the point measurements (at least 2 measurements, one for each face) of its first round is used as the reference coordinate. However, you can edit the coordinates later.
• The first time a new target point has been detected in any imported file or round, it is added to the global point list, if it has been measured at least once in each face.