Only distances are measured in trilateration and each side is measured repeatedly to insure precision. The entire network is then adjusted to minimize the effects of the observations errors. The angles of the triangles are computed so the geodetic positions are obtained as in triangulation.
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Text 12 |
become available |
становиться доступным |
consist of |
состоять из |
conterminous states |
смежные/пограничные штаты |
Traverse
The simplest method of extending control is called traverse. The system is similar to dead reckoning navigation where distances and directions are measured. In performing a traverse, the surveyor starts at a known position with a known azimuth (direction) to another point and measures angles and distances between a series of survey points. With the angular measurements, the direction of each line of the traverse can be
TRANSCONTINENTAL TRAVERSE
Figure 13
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