基于GIS、RS的四川省地貌区划

A STUDY OF GEOMORPHOLOGICAL REGIONALIZATION OF SICHUAN USING GIS AND RS

采用数字高程模型(DEM)数据,基于地理信息系统(GIS)空间分析和消融方法、遥感(RS)中主成分变换和非监督分类方法,得到地貌类型矢量边界,建立了四川省地貌分类系统并完成区划。主要结论如下:(1)运用均值变点法,求出适用于四川省地貌要素计算的最佳统计单元为1.82 km2;(2)利用离散分析和相关性分析的定量循环体系,实现四川省地貌要素集的有效选取;(3)根据以上方法,四川省划分出川西北高原区(Ⅰ)、川西山地区(Ⅱ)及四川盆地区(Ⅲ)。结果经验证表明,选取的地貌要素有效体现四川省地貌特征,区划结果细致反映出四川省地貌格局及差异、改进了传统数字地貌区划栅格状、琐碎化的不足。

Using digital elevation model （DEM） data, based on spatial analysis and eliminate method of Geo- graphic Information System （GIS）, based on principal component transformation and unsupervised classification of remote sensing （ RS）, obtaining geomorphic type vector boundary, establishing landscape classification system and completing the geomorphological regionalization of Sichuan Province. The main conclusions are as follows： （ 1 ） using the method of mean value variation, the optimal statistical unit for Sichuan Province geomorphological factor calculation is 1.82 km2 ; （2） using the quantitative circulation system of discrete analysis and correlation a- nalysis, the effective selection of Sichuan geomorphologic factors set can be realized; （3） according to the a- bove method, divided into Northwest Sichuan Plateau （ Ⅰ ）, West Sichuan Mountains （ Ⅱ ） and Sichuan Basin （Ⅲ） . The result of geomorphological regionalization can reflect the geomorphological pattern and difference of Sichuan Province in detail, and the results can improve the traditional digital geomorphology grid pattern and trivi- alization.