基于ASTER GDEM的江苏省地貌类型分类

Classification of Geomorphologic Types in Jiangsu Province based on ASTER GDEM

江苏省地处长江下游地区,人口密集、经济发达,全面地、科学地分析江苏省的地貌形态特征,对江苏省的城市发展、农业规划、自然灾害防治具有重大的决策支持意义。以江苏省为研究区,在ArcGIS 10.5软件平台上,基于ASTER GDEM V3数据集,通过均值变点分析法,确定21像元×21像元为提取地形起伏度的最佳分析窗口;依据海拔高度和地形起伏度,探索制定江苏省地貌类型分类体系,将江苏省分为低海拔平原、低海拔台地、低海拔丘陵、小起伏山地4种地貌类型。结果表明:江苏省地形以低海拔平原和低海拔台地为主,面积占比之和超过95%;低海拔丘陵和小起伏山地面积占比之和仅2.09%;低海拔丘陵和小起伏山地主要分布于东北部的连云港、西南部的南京、镇江、盱眙以及南部的太湖附近。

Jiangsu Province,where located in the lower reaches of the Yangtze River,is densely populated and economically developed.It is greatly meaningful for urban development,agricultural planning and natural disaster prevention to comprehensively and scientifically analyzes geomorphologic type in Jiangsu Province.We take Jiangsu Province as the study area,determines 21 pixels×21 pixels is the best analysis window for extracting relief amplitude through the mean point analysis method based on ASTER GDEM V3 dataset.We attempt to formulate the classification system of geomorphologic types in Jiangsu Province according to altitude and relief amplitude.Jiangsu Province is divided into four geomorphologic types:plain,platform,hill and low mountain with small relief.The results show that:the two major geomorphologic types are plain and platform,occupying more than 90%of the total area of Jiangsu Province.Hill and low mountain with small relief occupying just 2.09%of the total area.Hill and low mountain with small relief are mainly distributed in the northern,western and southern borders of Jiangsu Province.