最适宜坡度提取算法选择的研究——以福建省为例

The Choice of the Suitable Algorithms for Deriving Slopes----Taking the Research in Fujian Province as an Example

在福建省选取代表不同地貌类型的样区11个。采用6种算法从各样区对应的DEM中提取坡度。运用方差分析等方法,通过比较不同算法所提取坡度的分级面积数据,坡度的中误差,认为在本区域提取坡度选用三阶反距离平方权差分算法和三阶反距离权差分较为合理。根据实际生产部门需要,提出并实现了对坡度信息进行评价时必须分级别讨论的思路。研究可望为在本区域基于DEM提取准确的坡度信息时选择算法提供参考。

11 sample areas representing different types of physiognomy were selected.6 algorithms were employed to derive slopes from the DEM corresponding to each sample area.Employing the variance analysis,the researcher compares the slopes derived by different algorithms in such aspects as the mean square error and the area data of the graded slopes.It is concluded that the reasonable algorithms are those of three-order inverse distance square weight difference and three-order inverse distance weight difference.According to the actual requirement of production,the concept that the slope should be studied by dividing it into different grades is proposed.The sutdy can provide references for choosing suitable algorithms to derive accurate slope information in this region.