coordinates positional data. These positions can be referenced by parallels or plane coordinate axes. Its main purpose is to establish a network of triangulation stations.

(a)  

determines the elevation with respect to sea level. Its main objective is to establish a network of reference benchmarks.

(a)  

It is a method for extending horizontal control for topographic and similar surveys which require observations of triangular figures whose angles are measured and whose sides are determined by trigonometric computations.

(a)  

It consists of a series of triangles in which one or more sides of each triangle are also sides of adjacent triangles.

(a)  

These are the vertices of the triangles in a triangulation system

(a)  

It is one of the lines in a triangulation system whose length is precisely measured and its true direction is determined by astronomical observations.

(a)  

It is one of the lines in a triangulation system whose length is also precisely measured and may be located at regular intervals or at the end of triangulation system. It serves as a check for triangulation computations involving lengths of lines.

(a)  

It is a method used for horizontal control surveys which is based on measured horizontal distances. It consists of a series of joined or overlapping triangles where sides are measured and the angles are computed.

(a)  

These are surveys employed to establish geodetic latitudes and longitudes and plane rectangular coordinates of a fundamental networks of reference stations

(a)  

These are surveys run by barometric, trigonometric and differential leveling to establish elevations for a network of monuments called benchmarks.

(a)  

It is the simplest form of triangulation system, however, does not yield to the most accurate results since it lacks certain checks to balance small errors.

(a)  

It is the most used triangulation system. Each figure is mad up of two pairs of overlapping triangles.

(a)  

It is a triangulation system that is composed of a group of triangles in which there is a station at a vertex common to all triangles.

(a)