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基于淮河流域、黄河源区、东江流域三类不同地形区的DEM,利用简单差分、二阶差分、Frame差分、三阶不带权差分、三阶反距离平方权差分、三阶反距离权差分六种算法计算了坡度、坡向值,引入面积累积曲线来判断六种坡度、坡向计算方法在三类不同地形区的适用性。结果表明,三阶差分系列算法在三个地区适用性较好;简单差分、二阶差分的适用性较差;Frame差分在黄河源区、东江流域的坡度、坡向计算中结果较好。
Based on the three types of DEMs in the three different types of terrain areas, such as the Huaihe River Basin, the Yellow River source region and the Dongjiang River basin, the differential equations Six kinds of algorithms calculate the slope, aspect value, the introduction of the cumulative curve of the area to determine the six slope, slope calculation method in three different types of topography applicability. The results show that the third-order difference series algorithm has good applicability in three regions; the simple difference and the second-order difference have poor applicability; the frame difference is better in the calculation of slope and aspect in the source region of the Yellow River and the Dongjiang River.