JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE) ›› 2016, Vol. 46 ›› Issue (6): 31-39.doi: 10.6040/j.issn.1672-3961.0.2015.430

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A vector data matching algorithm based on slope difference and azimuth

LU Yuefeng1, ZHANG Kui1, LIU Shuo1, WU Yue1, ZHAO Shuo1, LI Qiang2, FENG Chen1   

  1. 1.School of Civil and Architectural Engineering, Shandong University of Technology, Zibo 255049, Shandong, China;
    2. Institute of Geospatial Information, Information Engineering University, Zhengzhou 450001, Henan, China
  • Received:2015-12-25 Online:2016-12-20 Published:2015-12-25

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Abstract: Vector spatial data with the correspondence feature point searching and the correspondence feature point matching is the key technology for multi-temporal and multi-scale geographic entity element to detect change. The research proposed a correspondence geographic entity element feature point searching and matching algorithm based on the coordinate characteristic and azimuth of vector spatial data. Firstly, the algorithm adopted the idea of taking point step by step: extracted extreme point from the X, Y direction of curve as initial feature points respectively; used the absolute value of the slope difference of each extreme point as constraint condition to remove the redundant extreme point; in the above extraction result, there might be a large deformation between the two adjacent feature points. Secondly, utilized coordinate azimuth and distance of the feature point synthetically to match the similarity of the correspondence feature point. Finally, the experimental verification was carried out by using the line entity and the surface entity. The result showed that the algorithm could be applied to the extraction and matching of the feature point of the line entity and the surface entity, and it had good accuracy and feasibility.

Key words: feature point searching, slope difference, azimuth, vector data, correspondence feature point, feature point matching

CLC Number: 

  • TP391
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