Update Setups; Terminology - Leica GPS1200+ Technical Reference Manual

Geodetic satellite receiver

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Unknown backsight

Update Setups

This chapter describes technical terms related to Setup.

Setup is an application program on TPS1200+ instruments. It can be used to orientate the

TPS1200+ instrument.

In a TPS survey, the instrument is set up over a point.

A reading onto a fixed point of reference, usually a benchmark of some sort, is taken in order

to orientate the instrument. This reading is called backsight.

Since a survey progresses from a point of known position to points of unknown position, a

backsight is a reading looking backward along the line of progress.

A point with unknown coordinates used as backsight point is called unknown backsight point.

It may happen that at the time of a set up, the coordinates of the backsight point are not

known yet. The survey starts with wrong angles. The coordinates of the backsight point are

determined later by a COGO calculation, for example, or by GPS.

If the coordinates of the unknown backsight point are determined, the setup using this back-

sight has to be updated in order to correct the angles. Additionally, the coordinates of all TPS

measurements related to this setup must be recalculated.