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Ch.2
Triangulation and Trilateration Nets
The horizontal positions of points is a network developed to provide accurate control
for topographic mapping, charting lakes, rivers and ocean coast lines, and for the
surveys required for the design and construction of public and private works of large
extent. The horizontal positions of the points can be obtained in a number of different
ways and are:
1. Traversing 2. Triangulation
3. Trilateration 4. Intersection
5. Resection and 6. Satellite positioning
CLASSIFICATION OF TRIANGULATION SYSTEM
TRIANGULATION FIGURES AND LAYOUTS:
The basic figures used in triangulation networks are the triangle, braced or geodetic
quadrilateral, and the polygon with a central station
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