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Method for generating smooth entity by contour lines

A contour and entity technology, applied in the field of high lines, can solve the problems of discontinuous first derivative, rough surface, single surface model, etc., and achieve the effect of overcoming computing costs, improving resource utilization and result convergence rate

Active Publication Date: 2018-01-09
GUODIAN UNITED POWER TECH
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Problems solved by technology

However, this method has the problems of single surface model, rough surface, and discontinuous first derivative.

Method used

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  • Method for generating smooth entity by contour lines

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Embodiment Construction

[0028] Refer to attached figure 1 As shown, the method for generating a smooth entity from contour lines in this embodiment includes the following steps:

[0029] (1) Check and correct the contour line to be used

[0030] Traversing all contour elevation values ​​requires removal of contour error information, such as null values, contour intersections, etc., to ensure that each contour has a definite actual physical meaning.

[0031] (2) convert described contour lines into Delaunay triangulation with Delaunay triangulation algorithm;

[0032] Specifically, the specific steps of generating the Delaunay triangulation according to the hollow circle rule are as follows:

[0033] A1. Starting from an inflection point of any contour line, find the second point closest to this point, and connect the starting point with the second point;

[0034] A2. Continue to search for the third point closest to the second point, connect the second point with the third point and the starting p...

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Abstract

The invention discloses a method for generating a smooth entity by contour lines. The method comprises the steps of: (1) inspecting and correcting a contour line to be used; (2) transforming the contour line into a Delaunay triangulation network by a Delaunay triangulation algorithm; (3) inquiring a obtuse triangle in the Delaunay triangulation network, and performing grid refinement on the obtusetriangle to convert the obtuse triangle into a Grid matrix grid, then generating a smooth entity. The step (3) specifically comprises: traversing all triangles and establishing indexing geographicalnumbers; when a triangle is an obtuse triangle and an obtuse angle is greater than 120 degree, performing grid refinement on the obtuse triangle and circumference according to the indexing geographical numbers and a row and column matrix; and deleting the obtuse triangle so as to obtain the smooth entity. A solid surface generated in the invention is a locally smooth curved surface, can provide obvious surface features and greatly improves the resource utilization rate and the result convergence rate of the high performance cluster computing of the smooth entity.

Description

technical field [0001] The invention relates to the technical field of contour lines, in particular to a method for generating smooth entities from contour lines. Background technique [0002] As important spatial geographic information and core data for terrain analysis, contour lines have played a huge role in scientific research and economic fields such as surveying and mapping, resources and environment, disaster prevention and control, and national defense. The quality of the digital elevation model is the core issue when the contour line is converted into a digital elevation model. However, whether the converted digital elevation model can realistically represent the surface is the key to the problem. [0003] Irregular triangular network composed of Delaunay method is the main method commonly used to represent the terrain surface, which has the advantages of small information redundancy of the whole field and strong approximation of the surface grid. However, this me...

Claims

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Application Information

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IPC IPC(8): G06T17/05G06T17/20
Inventor 褚景春袁凌张亦澄李润祥李长亮罗方正袁飞杨帆赵斌牟金磊梁功有潘磊
Owner GUODIAN UNITED POWER TECH
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