地形图中冲沟与陡崖符号的自动提取方法

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Automatic extraction of gullies and cliffs from topographic map

YANG Yun(1,2);ZHU Chang-qing(2);SUN Qun(2);ZHANG Zi-jing(3)

(1) Xi′an Research Inst. of Surveying and Mapping, Xi′an 710054， China
(2) Inst. of Surveying and Mapping, Information Eng. Univ., Zhengzhou 450052， China
(3) Key Lab. of Radar Signal Processing, Xidian Univ., Xi′an 710071， China

Received:1900-01-01 Revised:1900-01-01 Online:2006-06-20 Published:2006-06-20

Abstract

Abstract: In GIS geospatial data acquisition, there are many map scanning digitizing systems in which automatic tracking method is used for digitizing contour lines. The performance is, however, far from satisfactory because a great deal of editing is involved. In this paper, we analyze two map symbols: the gully and the cliff, which greatly affect the efficiency of automatic digitization, and propose a new method called revolving inner tracking for extracting gullies and cliffs from separated contour images. Experimental results show that the proposed method has greatly improved the efficiency and the accuracy of digitizing the two symbols. The method has been successfully applied to 1∶50000 scale map digitizing production.

Key words: map digitization, gully, cliff, extraction

CLC Number:

TP751

YANG Yun(1;2);ZHU Chang-qing(2);SUN Qun(2);ZHANG Zi-jing(3).

Automatic extraction of gullies and cliffs from topographic map

[J].J4, 2006, 33(3): 504-508.

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Automatic extraction of gullies and cliffs from topographic map

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