模糊聚类的DEM确定耕地坡度方法

针对实际应用的坡度计算中没有考虑DEM高程精度影响这一状况,提出采用模糊聚类法进行坡度分级,给出了具体的精度评定方法,并采用我国南方某地区一个镇的第二次土地调查耕地成果数据进行了分析,与传统的直接计算方法进行了比较。结果表明,两种方法得到的图斑坡度级别基本相同;从总体分类精度与Kappa系数计算来看,两者基本接近,模糊聚类法略微优于直接计算法,而且由于其顾及了DEM高程精度的影响,得到的分级结果可靠性更高。

Method for Calculating Farmland Parcel's Average Slope by Using Fuzzy Statistical

For the mostly using of calculating slops, the DEM elevation accuracy doesn＇t be taken into account. Fuzzy statistical method and its precision evaluation are been used in the article for farmland parcel＇s average slope calculation the effect of DEM elevation accuracy. Then some town farmland parcel data is been used to test the method and comparing with the usual direct calculating result. The result shows that the result of the two methods is in substance consistent and the fuzzy statistical method is little better than the direct method.