地理科学 ›› 2012, Vol. 32 ›› Issue (1): 101-104.doi: 10.13249/j.cnki.sgs.2012.01.101

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基于变点分析法提取地势起伏度——以青藏高原为例

韩海辉(), 高婷, 易欢, 杨敏, 阎晓娟, 任广利, 杨军录   

  1. 中国地质调查局西安地质调查中心, 陕西 西安 710054
  • 收稿日期:2010-11-04 修回日期:2011-03-08 出版日期:2012-01-20 发布日期:2012-01-20
  • 作者简介:

    作者简介:韩海辉(1983-),男,青海西宁人,助理工程师,研究方向为遥感与GIS应用。E-mail:hanhh06@hotmail.com

  • 基金资助:
    中国地质调查局项目“西昆仑成矿带矿产资源遥感综合调查(西安地调中心)(基[2010]矿评03-04-02)”资助

Extraction of Relief Amplitude Based on Change Point Method: A Case Study on the Tibetan Plateau

Hai-hui HAN(), Ting GAO, Huan YI, Min YANG, Xiao-juan YAN, Guang-li REN, Jun-lu YANG   

  1. Xi′an Center of China Geological Survey, Xi′an, Shaanxi 710054, China
  • Received:2010-11-04 Revised:2011-03-08 Online:2012-01-20 Published:2012-01-20

摘要:

以青藏高原区域大尺度SRTM3-DEM为数据源,运用GIS的窗口递增分析法依次计算2×2、3×3、4×4、5×5、…、32×32窗口下的地势起伏度,然后采用均值变点法科学的分析平均地势起伏度的最佳统计面积并进行分级分析,得出实验区最佳分析窗口面积为1.17 km2,地势起伏度可分出八级,其中小起伏山地分布最广。高原边缘的地势起伏度普遍较大主要是由于构造运动与河流朔源侵蚀作用强烈;而高原内部地势较为平缓,冰川、冻土作用下的侵蚀搬运可能对地势起伏的影响更大。

关键词: 变点分析法, 地势起伏度, 青藏高原

Abstract:

Choosing scientific method to extract and express relief amplitude has become the critical factor to improve the effectiveness and practicality in relief research. Based on SRTM3-DEM, the relief amplitude with increasing grid window method in the Tibetan Plateau was extracted, and then the best window area by the mean change point method was calculated. The result shows that 1.17km2 could be the best window area, the relief amplitude can be divided into eight classes, and the most widely distributed class is low rolling mountain. The relief amplitude is generally more violent at the edge of the plateau. It is mainly due to the intensive tectonic movement and river headward erosion. While the terrain is relatively flat in hinterland of the plateau, the erosion and removal caused by glaciation and unfreezing may be the greater impact on the relief amplitude.

Key words: change point method, relief amplitude, Tibetan Plateau

中图分类号: 

  • P931