摘要
Abstract
The traditional division methods of landform types are mostly based on a single or some fixed terrain factors, which are one-sided and subjective. This paper proposes a new automatic division method that adopts 6 terrain factors, altitude, relief amplitude, rate of slope change, surface roughness, coefficient of elevation varia-tion and cumulative surface curvature. The initial data is SRTM DEM in 30m resolution, then a mean value change-point algorithm is applied to get the optimum statistical unit to calculate relief amplitude of Nanyang city, which is 27 × 27 cells, about 0. 6561 km2 . After this, cluster analysis is performed by Iso cluster tool and maxi-mum likelihood classification tool in ArcGIS 10 . 1 , also isolated patches in cluster outcome data is merged to gen-erate the final 5 landform types.关键词
地貌形态类型/SRTM DEM/地势起伏度/南阳市Key words
landform types/SRTM DEM/relief amplitude/Nanyang city分类
天文与地球科学
