Coordinate conversion parameter calculating method based on adjacent control point sets

A technology for parameter calculation and coordinate transformation, which is used in computing, electrical digital data processing, special data processing applications, etc.

Inactive Publication Date: 2012-11-14
ZHENGZHOU UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to solve the automatic seamless coordinate transformation parameter calculatio...

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  • Coordinate conversion parameter calculating method based on adjacent control point sets
  • Coordinate conversion parameter calculating method based on adjacent control point sets
  • Coordinate conversion parameter calculating method based on adjacent control point sets

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Embodiment Construction

[0018] Below in conjunction with accompanying drawing and example, the implementation steps of the present invention are described in detail as follows:

[0019] as attached figure 1 , there are 11 known control points in the figure, and 140 points to be sought. Calculate the seven parameters of coordinate transformation at each point to be sought.

[0020] Step 1: Calculate the Delaunay triangulation network composed of all control points based on the plane coordinates, such as figure 1 shown. For small-angle triangles on the sides of the convex hull, the minimum angle threshold can be set in the algorithm to automatically filter them out. The 2-8-10 triangle in the figure is filtered out, and can be manually removed or added for special needs.

[0021] Step 2: Control point checking. The control points involved in parameter calculation may not be accurate or have gross errors, so filtering and screening are required. First, the adjacent control points of each control po...

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Abstract

The invention discloses a coordinate conversion parameter calculating method based on adjacent control point sets and belongs to the technical field of earth measurement, digital maps and geographic information. The coordinate conversion parameter calculating method mainly aims at how control points on the periphery of a point to be solved performs automatic and reasonable selection and how to achieve reasonable and efficient automatic calculating of seamless coordinate conversion parameters in large-range seamless coordinate conversion parameter calculating. The coordinate conversion parameter calculating method includes: building a Delaunay triangular net on the basis of known control points, automatically extracting an adjacent control point set of each control point on the basis of the triangular net, calculating parameter back substitution and then calculating residual of each point, and accordingly filtering gross error and suspicious control points; and adding parameter points such as map border points or grids, automatically calculating the adjacent control point set corresponding to each point through the Delaunay triangular net built on the basis of control points, and solving coordinate conversion parameters needed by all points on the basis of corresponding adjacent control point sets. By adopting the coordinate conversion parameter calculating method, the coordinate conversion parameters in a wide range can be calculated massively, efficiently and seamlessly, the coordinate conversion parameter calculating method plays an important role in the fields of geodetic coordinate conversion, map data coordinate conversion and the geographic information system, and good economic benefit is obtained.

Description

technical field [0001] The invention relates to the technical fields of geodetic surveying, digital maps and geographic information, in particular to a calculation method for coordinate transformation parameters between different ellipsoids. Background technique [0002] Different countries and regions use different ellipsoids and projection systems, which lead to different spatial coordinate systems, which lead to differences in the coordinates of spatial points and map data coordinate systems. For example, my country has successively established Beijing 54, Xi'an 80, and 2000 national coordinate systems. Due to the different coordinate systems, there are many coordinate forms in the surveying and mapping results. Without coordinate conversion, the surveying and mapping results in different coordinate systems cannot be directly used. With the deepening of the application, it is necessary to efficiently and automatically realize the seamless coordinate transformation of map...

Claims

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Application Information

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IPC IPC(8): G06F19/00G09B29/00
Inventor 闫超德郭王杨存吉罗先学周建康郭同德贺添赵姗杨丽坤赵艳坤王胜利
Owner ZHENGZHOU UNIV
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