Acta Geodaetica et Cartographica Sinica ›› 2023, Vol. 52 ›› Issue (8): 1364-1374.doi: 10.11947/j.AGCS.2023.20210573

• Cartography and Geoinformation • Previous Articles     Next Articles

Relationship between scale change and median Hausdorff distance of river elements

ZHANG Xingang1,2, YAN Haowen2   

  1. 1. School of Geography and Ocean Science, Nanjing University, Nanjing 210023, China;
    2. Faculty of Geomatics, Lanzhou Jiaotong University, Lanzhou 730070, China
  • Received:2021-10-14 Revised:2022-04-12 Published:2023-09-07
  • Supported by:
    The National Natural Science Foundation of China (No. 41930101); 2021 Central-Guided Local Science and Technology Development Fund of Gansu Province (No. YDZX20216200001803)

Abstract: Map generalization is essentially a similar transformation process, and the quantitative analysis of this particular process is of great practical significance. In this paper, the universal functional relationship between scale change and median Hausdorff distance of river elements is obtained via large sample statistics. Firstly, randomly selecting river samples from a 1∶10 000 vector river database, and a multi-scale river element dataset is constructed via manual simplification. The median Hausdorff distance is used to measure the multi-scale similarity of river elements, and a quantitative functional relationship between scale change and median Hausdorff distance is presented via curve fitting. Subsequently, a preliminary applicative exploration of applying the functional relationship to the control of the map generalization process is presented, and the automatic determination of thresholds for BS (bend-simplify) algorithm, DP (Douglas-Peucker) algorithm, and WA (weighted-area) algorithm is achieved. Experimental results show the strong useability of the proposed functional relationship, which contribute to the full automation of the existing semi-automatic map generalization algorithms.

Key words: river element, median Hausdorff distance, scale, similarity, map generalization

CLC Number: