AMX AXT-CV TiltScreen CATP Manual de instrucciones descargar pdf (Pagina 83)

15. RESECTION MEASUREMENT

& Precaution when performing resection

In some cases it is impossible to calculate the coordinates of an unknown point (instrument

station) if the unknown point and three or more known points are arranged on the edge of a

single circle.

An arrangement such as that shown below is desirable.

It is sometimes impossible to perform a correct calculation in a case such as the one below.

When they are on the edge of a single circle, take one of the following measures.

(1) Move the instrument station as close as possible

to the center of the triangle.

(2) Observe one more known point which is not on the

circle.

(3) Perform a distance measurement on at least one

of the three points.

• In some cases it is impossible to calculate the coordinates of the instrument station if the included

angle between the known points is too small. It is difficult to imagine that the longer the distance

between the instrument station and the known points, the narrower the included angle between the

known points. Be careful because the points can easily be aligned on the edge of a single circle.

: Unknown point

: Known point

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AMX AXT-CV TiltScreen CATP Manual de instrucciones Pagina 83