Method for carrying out quasigeoid refining on superlarge region on basis of seamless partitioning technology

Abstract

The invention discloses a method for carrying out quasigeoid refining on a superlarge region on the basis of a seamless partitioning technology, which comprises the following steps of: a step 1 of acquiring data; a step 2 of carrying out grid dividing on the whole region; a step 3 of sequentially calculating a height anomaly xi of each grid point in a grid model; a step 4 of establishing the grid model; and a step 5 of interpolating a grid. After the method disclosed by the invention is adopted, manual partitioning does not need to be carried out and the problem of edge connection of the region does not exit. When the model is applied, the grid interpolation can be directly carried out. As shown in Figure 2, the height anomaly of any one point in a certain grid in the region can be calculated by interpolation through adopting a bilinear interpolating method.

Description

technical field [0001] The invention relates to the technical field of surveying and mapping, in particular to a method for refining a super-large area quasi-geoid based on a seamless partition technology. Background technique [0002] Quasi-geoid refinement is of great significance for surveying and mapping work: (1) quasi-geoid is the elevation datum for obtaining geospatial information; (2) GPS (Global Positioning System) technology combined with high-precision, high-resolution quasi-geoid The water level model can replace the traditional water level measurement method to determine the normal height, and truly realize the three-dimensional positioning function of GPS technology in the geometric and physical sense; (3) In the current GPS positioning era, the refined regional geoid and the establishment of The national high-precision GPS positioning network or the traditional national elevation control network are equally important. It is a geodetic infrastructure for a cou...

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Problems solved by technology

(2) Combination method: the gravitational quasi-geoid determined by the current gravity method has high resolution but low precision, while the geometric quasi-geoid determined by GPS / leveling has high precision but low resolution

The zoning work requires rich engineering experience, and the zoning results are different, which has a great impact on the fitting results and fitting accuracy of the entire area;

[0009] (2) The "regional edge problem" after partition fitting is difficult to deal with

The geoid-like connection between adjacent cells (that is, the regional border problem) is very critical for forming a complete and smooth digital model of regional elevation anomalies. Due to the different actual conditions between cells, the type of fitting model used Diverse, there is still no general smooth connection method

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