GB/T 28584-2012Specifications for the establishment of urban coordinate system (English PDF)

3.1 Urban Coordinate System

In order to meet the needs of urban construction, planning and construction of the establishment, including urban plane coordinate system and elevation systems. In order to reduce investment

Movies deformation plane coordinate system established by the city tend to be relatively independent, but need to establish contact with the national coordinate system established by the Urban Elevation

Consistent with the national legal system should elevation benchmarks.

3.2 Gauss plane coordinate system

Gauss - Kruger projection (Gauss projection for short) established by the plane rectangular coordinate system, the origin of each projection with the central meridian of the tape

The intersection of line and the equator, x-axis positive direction for the central meridian north, y-axis positive direction to the east of the equator.

3.3 Height Compensation Plane

In order to avoid or reduce the length of the deformation, deformation based on Gauss projection length of the selected relative to the reference ellipsoid raise or lower the elevation reference

Test surface, the length of the reference surface deformation is small or zero.

3.4 Urban framework network

By a number of high-precision control points established by satellite positioning technology, has a three-dimensional reference maintain the city, passing precision geocentric sit

Standard network and improve the control precision effect.

3.5 Urban basic network

By urban framework on the basis of further network encryption configuration, control data for providing urban infrastructure to meet the measurement needs of local city […]