geodetic survey

The GPS is typical geodetic survey method, its results belong to the Normal system, and the total station observations belong to the Vertical system.

GPS是典型的大地测量手段，其控制成果属于法线系统，全站仪观测值则是属于垂线系统。

Finally, All function and use specification of triangulation subsystem and leveling subsystem in geodetic survey database system is given in using segment.

系统使用部分对大地测量数据库系统设计的各种功能以三角测量子系统和水准测量子系统两部分的使用方法分别进行了描述。

National Geodetic Survey Database is an important part of National Spatial Data Infrastructure ( NSDI)-National Spatial Data Infrastructure database.

国家大地测量数据库是国家空间数据基础设施（NSDI）&国家空间数据基础数据库的重要组成部分。

Compared with the traditional methods of geodetic survey, such as Leveling, bedrock bench mark, GPS, etc., InSAR interferometric techniques can obtain high spatial resolution surface deformation details in the large-scale, which precision can reach to the centimeter level.

相对于水准测量、分层标、GPS等传统大地监测方法，InSAR干涉测量技术可以大范围获取高时、空分辨率的地表形变细节信息，精度可达到厘米级。