Geometric matching map sheet joint method based on circular region fitting

A circular area and map frame technology, which is applied in the field of geometric matching map frame bordering based on circular area fitting, can solve the problems of low matching efficiency and low matching accuracy, reduce the amount of calculation, and improve matching efficiency , improve the effect of matching accuracy

Inactive Publication Date: 2015-02-18
TAIYUAN UNIV OF TECH
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Problems solved by technology

[0003] In order to solve the problem of low matching efficiency and low matching accuracy of the geometric matching method in the ex...

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  • Geometric matching map sheet joint method based on circular region fitting
  • Geometric matching map sheet joint method based on circular region fitting

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Embodiment Construction

[0013] The method of geometric matching map frame bordering based on circular area fitting, this method is realized by the following steps:

[0014] a. Select two adjacent frames;

[0015] b. From each line feature in one of the map frames (such as figure 1 Select a line element from LA11, LA12, LA13) as the baseline element (such as figure 1 LA11 in ), and set a distance threshold; then, a circular buffer zone is generated with the end point of the baseline feature as the center and the distance threshold as the radius; then, from each line feature in another map frame (such as figure 1 In LA21, LA22, LA23) select several line features that intersect with the circular buffer zone, and use each selected line feature as a candidate line feature with the same name (such as figure 1 LA21, LA22 in);

[0016] c. Select baseline elements (such as figure 2 LA11) in LA11) and two nodes close to the boundary line, and according to the selected endpoints and two nodes to generate t...

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Abstract

The invention provides a map sheet joint method, and particularly relates to a geometric matching map sheet joint method based on circular region fitting. The method solves the problems that matching efficiency of a geometric matching method of an existing map sheet joint method is low and matching accuracy is low. The geometric matching map sheet joint method based on circular region fitting includes the following steps that (a) two adjacent map sheets are selected; (b) one line element is selected from multiple line elements in one map sheet to serve as a basic line element, a distance threshold value is set, and a circular buffer region is formed with the end point of the basic lien element as a circle center and the distance threshold value as a radius; (c) the end point of the basic element and two nodes close to a boundary line are selected and a fitting straight line of the basic line element is generated according to the selected end point and the two nodes; (d) slope differences between fitting straight lines of candidate line elements with the same name and the fitting straight line of the basic line element are calculated. The method is suitable for map sheet joint.

Description

technical field [0001] The invention relates to a frame bordering method, in particular to a geometric matching frame bordering method based on circular area fitting. Background technique [0002] In the process of framing or surveying and mapping, due to reasons such as paper expansion and contraction, digitization errors, and manual operation errors, geometric position deviations often occur between geographical elements with the same name that span adjacent map frames, resulting in gaps between adjacent map frames. Continuous seamless splicing cannot be achieved during the interval, which seriously affects the accuracy of the map. Therefore, in order to ensure continuous and seamless splicing between adjacent map frames, it is necessary to match geographical elements with the same name across adjacent map frames. This matching process is called map frame bordering. The existing geometric matching frame border method refers to: select a certain geographic element in a cer...

Claims

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Application Information

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IPC IPC(8): G06T3/40
CPCG06T3/4038
Inventor 高保禄陈俊杰李海芳徐成武董志锋
Owner TAIYUAN UNIV OF TECH
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