The realization of cross-sea elevation datum transmission by geopotential difference

A technology of datum transfer and elevation, applied in the direction of height/horizontal measurement, measuring devices, instruments, etc.

Inactive Publication Date: 2011-11-02
鲍李峰
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Problems solved by technology

Since it is impossible to implement precise geometric leveling at sea, how to accurately calculate the difference in gravity level between two points in the sea area is still a key problem that has not been well resolved in the current international geodesy research

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  • The realization of cross-sea elevation datum transmission by geopotential difference
  • The realization of cross-sea elevation datum transmission by geopotential difference
  • The realization of cross-sea elevation datum transmission by geopotential difference

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Embodiment Construction

[0075] With the accumulation of oceanographic observation data and the development of space geodetic technology, the accuracy and resolution of mean sea level height and ocean geoid have been continuously improved; value) has also been continuously improved. Due to the short distance between virtual stations (usually set to a few kilometers, determined by the resolution of the ocean gravity field), the sea topographic observations at adjacent stations are almost equally affected by various error factors, so the difference is used instead Leveling height difference observation is theoretically feasible. On the other hand, on land, although the precise geometric level can reach millimeter-level accuracy, the topography of the point to be measured has large fluctuations, and the average gravity value on the vertical line between it and the geoid is related to the crustal density below the point to be measured. It can neither be measured nor calculated accurately, and usually can...

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Abstract

The invention relates to a cross-sea elevation datum transmission method for determining our nation's territorial sea island elevation, comprising the following steps of: calculating the land elevation datum begins reckoning geopotential value by the use of the relation between the geopotential and the elevation; deriving the formula for calculating the cross-sea geopotential difference; calculating the geopotential value of one point in a sea area according to the calculation formula and marine gravitational field data, determining the elevation value of the point corresponding to the elevation value of the land elevation datum to realize the accurate transmission of cross-sea elevation datum. The inner precision and the practical accuracy of the method provided by the invention are respectively estimated and checked by using data from 33 tide gauge stations in the offshore of China and 54 tide gauge stations on Japan's coast. The result of a test shows that the method provided by the invention can be used to transmit China's elevation datum in 1985 to sea areas near the islands and convert sea area GPS geodetic height into an elevation value of the elevation system in 1985 with the precision being better than 10 cm.

Description

Technical field: [0001] The invention relates to a cross-sea elevation datum transfer method, in particular to the determination of the elevation datum of islands and reefs in my country's territorial waters. Background technique: [0002] The height datum is the starting calculation basis for calculating all the horizontal heights in the national unified height control network. Its basic definition is related to the reference surface for the starting calculation of the height, including a leveling base and a permanent leveling origin. The 1985 national elevation datum currently adopted by our country is a local elevation datum, and its datum is the mean sea level of the Yellow Sea determined by the tidal data of Dagang Tide Gauge Station in Qingdao from 1952 to 1979, that is, the zero elevation surface. At present, my country has established the layout and calculation of the national elevation control network covering the national land and some coastal islands, which provid...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C5/00
Inventor 鲍李峰
Owner 鲍李峰
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