Cutting method

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As a cutting method or cutting in are surveying and geodesy different methods of Punkteinmessung called, come in the straight sections are used. With the theodolite or tachymeter, the new points are aimed at from known points ( survey points ) - or vice versa - and the intersection point is determined by these directional measurements .

In the past, when there were no distanceers for electronic distance measurement, the cutting methods were standard for all longer distances over about 200 meters. For nearby points, the direction and distance measurement (with theodolite and tape measure ) was combined - see polar image .

As a rule, the two-dimensional solution (in the plane of the coordinate system used ) is sufficient for the section calculation , possibly supplemented by additional height measurement at the new point. If, on the other hand, the influence of the curvature of the earth becomes too great (from sight lengths of a few kilometers), a three-dimensional solution is preferable to the cutting task.

Cutting methods with pure direction measurement are:

  1. the forward cut : measurement to the new point from two known points (with mutual view)
  2. the sideways section : measurement from a known point as well as at the new point
  3. the reverse cut : measurement at the new point after three known points (see, however, dangerous circle ).

More rarely used procedures are u. a.

Entire surveying networks can also be built using intersection methods - see triangulation (geodesy) and trilateration .

See also: Free choice of viewpoint , bulkhead