基于栅格DEM的微观地形分类技术

Micro-landform classification technique and experiment based on grid DEM

认为微观地貌形态的划分是宏观地貌形态划分的延续,基于栅格数字高程模型(DEM)和数字地形分析(DTA)技术实现微观地貌形态分类的关键在于提取地形地貌因子和制定合理的分类决策方案.以土壤侵蚀研究中的临界坡度值为参考,改进了Dragut提出的山体部位划分的分类决策方案.采用黄土高原的局部DEM进行了山体部位分类的试验研究,实现了微观地形地貌的自动分类,试验结果揭示了微观地形地貌分布与土壤侵蚀之间的关系.

It is considered that micro-landform classification originated from macro-landform classification. The techniques of micro-landform classification based on DEM and DTA are investigated. To extract landform factors and to make classification decisions are the most critical techniques of micro-landform classification. The slope threshold in soil erosion re- search is referenced to improve Dragut＇s hill classification decision. The experiment based on improved hill classification decision is carried out using local grid DEM of Loess Plateau. Automated classification of micro-landform is realized. And relationship between the distributing of micro-landform and soil erosion is revealed.