Analysis of Conversion between Various Elevation Datum of Hydrologic Station
In the past,the understanding of base surface and level verification of hydrological stations remained fragmented and superficial,leading to multiple opinions on the solution of problems in the verification.In this paper,the concept of elevation datum of hydrologic station is put forward,and it is considered that hydrologic station has its own elevation system.The basic level has the function of"control point",realizing the elevation conversion between the elevation datum of hydrographic station and the national elevation datum.The concept and significance of frozen base of hydrologic station are expounded from the point of view of system by analyzing the conversion between various elevation datum.
Hydrological stationElevation datumFrozen base surfaceNational range
NETL
NSTL
万方数据
