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

A geoid and seam zoning technology, applied in the field of surveying and mapping, can solve problems such as low resolution, no smooth connection method, and different zoning results.

Inactive Publication Date: 2012-07-25
SOUTHEAST UNIV
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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;
[000

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

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Embodiment Construction

[0035] The present invention will be described in detail below in conjunction with specific embodiments.

[0036] Step 1: Data collection.

[0037] like image 3 As shown, there are 171 leveling measurement points of the C-level GPS network in JS Province, and the third-level leveling is adopted. Regional scope: the X-axis coordinate range is 3420-3874km; the Y-axis coordinate range is 362-864km. The 171 measurement control points in the area are basically evenly distributed throughout the area. The area is about 100,000km 2 , the average density of measurement control points is: every 1000km 2 The number of survey control points of is equal to 1.7, and the number of survey control points S of the whole area is equal to 171. JS Province is a plain area with a relatively large water area. The maximum elevation anomaly is 12.5377m and the minimum is -8.2549m. The elevation anomaly varies greatly. See Table 1 for the format of the data arrangement.

[0038] Table 1. Altitu...

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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...

Claims

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Application Information

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IPC IPC(8): G01C5/00
Inventor 胡伍生王浩胡杰
Owner SOUTHEAST UNIV
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