Theory And Application About Precise Determination Of Local Geoid Based On CQG2000

Regional geoid determination with centimeter-level precision is the geodesy research hotspot. It will provide multi-disciplinary research and application such as base map up date ,digital China geo-spatial framework, local monitoring on settlement, ocean science, weather forecast, earth science research, traffic, water resources and so on, It has significant scientific significance and tremendous economic and social benefit.At first the article describes basic theory and principles of precise determination of local geoid with GPS/ leveling data. The article introduce geometrical fitting model by dividing it into functional model, statistical model and integrated model. After detailedly expounding their principle and method, The article has discussed the remove-restore theory which computes geoid with GPS/leveling data and geopotential mode or terrain correction model. And then the article compares their precision and applicable area by making a frondose computation. Subsequently, The text introduces gravimetric method that applied in the geoid computation. At the last of the text, I research a new method of geoid determination which computes with GPS/leveling data and the new generation geoid of China that calls CQG2000, Although the CQG2000 has low precision, it has higher definition and it incarnates physical variety of the geoid in China which we can use as a flat, moreover, we use some GPS/leveling data that possess high precision, use remove-restore method for reference to fit the residual error of the CQG2000, and base on that we could gain high precise geoid. According to that theory, I applied all grid data of CQG2000 that come from the region in east china area: the eastern longitude 114°～116°, the northern latitude 26°～28°, and also one hundred and seventeen GPS/leveling data in the area to compute the regional geoid. With that experiment, the article has discussed the feasibility and superiority of the new theory, at the same time, the influence of GPS/leveling data amount and their space to the geoid determination precision has been researched.