20 18 knowledge points of surveying and mapping comprehensive ability of surveyors: layout of traditional geodetic control network

20 18 knowledge points of surveying and mapping comprehensive ability of surveyors: layout of traditional geodetic control network

Layout of traditional geodetic control network

(A) the construction of traditional geodetic control network

Using traditional geodetic technology to establish a plane geodetic control network is to calculate the coordinates of geodetic control points by measuring angles and sides. Its methods include: triangulation, traverse survey, trilateration and simultaneous measurement of corners.

(B) the principle of national triangulation layout

1) Hierarchical network layout and step-by-step control

First, the high-precision sparse first-level triangular lock nets criss-crossing all over the country form the backbone network of unified coordinate system. Then, according to the actual needs of different regions and different characteristics, the second, third and fourth triangulation networks are arranged respectively.

2) It has enough accuracy.

3) Have sufficient density.

4) There should be uniform specifications.

(3) Overall adjustment of national astronomical geodetic network

leave out