Space abnormal extreme value unbiased isogram drawing method

An isomap and anomalous technology, applied in the field of geographic information systems, can solve the problems of deviation, failure to properly solve the problem of border expansion and fill in the gap of the isomap, misleading and other problems, so as to reduce the generation of sick triangles, ensure the visualization effect, The effect of preventing center shift

Inactive Publication Date: 2014-08-20
CHINA UNIV OF GEOSCIENCES (WUHAN)
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Problems solved by technology

The above improved method of making contour maps based on TIN improves the visualization effect of cartography, but it does not properly solve the problem of expanding edges and filling gaps at the boundaries of contour maps.
[0006] The deviation betwe

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  • Space abnormal extreme value unbiased isogram drawing method
  • Space abnormal extreme value unbiased isogram drawing method
  • Space abnormal extreme value unbiased isogram drawing method

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Embodiment Construction

[0037] The present invention will be further described below in conjunction with drawings and embodiments.

[0038] The invention provides a method for drawing an unbiased equivalence map of spatial abnormal extremum, using discrete original sampling point sets to draw, combining figure 1 , including the following steps:

[0039] (1) Use the following steps to extract extreme points from the original sampling point set A:

[0040] (101) Construct an irregular triangular network to the original sampling point set A, and use the irregular triangular network to make a spatial anomaly equivalence map G1;

[0041] (102) According to the topological relationship between the contour line in the spatial anomaly contour map G1 and the points in the original sampling point set A, extract the sampling points located in the area delineated by the innermost contour line, and all the sampling points form a pole value point set A';

[0042] The extreme point is a point within the scope of ...

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Abstract

The invention provides a space abnormal extreme value unbiased isogram drawing method. Extreme point extracting is carried out on an original sampling point set A, and an extreme point set A' is obtained; extreme points are points with space attribute values higher or lower than all points around in a local neighborhood analysis range; the original sampling point set A is subjected to regular rectangular gridding, and a regular rectangular grid node point set B is obtained; the point set A' and the point set B are merged, and a point set C is obtained; abnormal grid nodes which cause generation of ill-conditioned triangles in the point set C are deleted, and a point set D is obtained; and the point set D is used for establishing a triangular irregular network, and an isogram G is drawn. According to the isogram drawn through the method, a space abnormal center and an extreme value point position are matched, a curve is smooth and attractive, visualization effect is guaranteed, and meanwhile isogram accuracy is improved.

Description

technical field [0001] The invention relates to a method for drawing an unbiased equivalence map of a spatial anomaly extremum, belonging to the field of geographic information systems. Background technique [0002] It is one of the important means to indicate spatial anomalies by using discrete sampled data to draw contour maps. The ideal equivalent map is as figure 2 (b) shown. Traditional contour drawing is mainly based on regular rectangular grid (Grid) and irregular triangulated network (Triangulated Irregular Networks, TIN). [0003] Grid data is usually interpolated from discrete point data. Thanks to the regularity and uniformity of the rectangular grid, the contour map drawn by the Grid method is more smooth and beautiful. However, this method uses the grid nodes as the reference points for contour tracking, ignores the position information of the original sampling points, will cause data distortion near the sampling points, and is difficult to accurately represe...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 刘修国任泽张剑波花卫华张唯
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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