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地面坡度是最重要的地形定量指标 ,建立科学合理的地面坡度分级体系是对坡度进行科学研究与坡度图制图必不可少的重要环节。总结了近年来在坡度分级研究方面的已有成果 ,将坡度分级方法归并为临界坡度分级、等差坡度分级、模糊坡度分级 3种方法。在说明了各种分类方法特点的基础上 ,探讨了其应用的适用性。以黄土丘陵沟壑区的韭园沟流域为实验样区 ,利用高精度 1∶ 1万比例尺的 DEM数据为信息源 ,建立了栅格数字坡度模型。利用分级统计的结果 ,对各种坡度分类方法所得到的地面坡谱进行了对比和分析
The slope of the ground is the most important quantitative index of the terrain. Establishing a scientific and reasonable grading system of the ground slope is an indispensable important step in carrying out scientific research and grading map. The existing achievements in slope grading research in recent years are summarized, and the gradient grading method is merged into three methods: critical grading, equal grading and fuzzy grading. Based on the characteristics of various classification methods, the applicability of the method is discussed. Taking the Jiuyuangou watershed in the gully region of the Loess Plateau as an example, a digital gradient model of raster was established using DEM data of 1: 10000 scale with high accuracy as the information source. By using the results of grading statistics, the ground slope spectra obtained by various slope classification methods are compared and analyzed