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。
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 re- lief 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.
出处
《地理科学》
CSCD
北大核心
2012年第1期101-104,共4页
Scientia Geographica Sinica
基金
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
关键词
变点分析法
地势起伏度
青藏高原
change point method
relief amplitude
Tibetan Plateau
