关键词: 防界线, 微观地形因子, 断面剖分, 坡度突变

Abstract: Defensive boundary as a basic linear terrain feature, it has broad application outlook in military field and civil field. However in the published literature extraction of defensive boundary only considers its visible range characteristic. Besides, because the accuracy is poor, defensive boundary extracted by existing methods cannot support the practical application. In this paper, a new defensive boundary extraction method focusing on the micro physical characteristic of the local defensive boundary is proposed. It analyzes the slope changes of mountain surface by using sliding window, and then screens out the feature points whose slope changes sharp, and finally combines with other constrains forming the defensive boundary. The results of the experiment show that the extracted feature lines accord with requirements of fortification.

Key words: defensive boundary, micro terrain factors, section subdivision, slope mutation