摘要
为了减小DEM分辨率下降所引起的地形坡度变缓效应,对直方图匹配算法在空间域上的精度进行验证,以山东丘陵北岩子口沟小流域为研究区,将研究区低分辨率坡度数据和高分辨率坡度数据进行直方图匹配,并对匹配后数据多项频率域和空间域指标进行评价。结果表明:直方图匹配算法可以很好地还原整幅图像坡度的最大值和平均值,地形粗糙程度得到了很好地恢复,但处理后的坡度相对于基准数据的中误差和误差标准差分别为23.5°和49.85°,与未处理的数据相差无几,说明算法只对地形统计特征的改善有效,对于实际地形的还原能力还有待改进。
In order to reduce the effect of slope reduction which was caused by the reduction of DEM resolution and to validate the accuracy of the histogram matching in spatial domain,a small watershed called Beiyanzikou was selected in the hilly areas of Shandong.The histogram matching methed was used to match the two images and evaluate the accuracy in both spatial and frequency domains in this area.The results showed that the algorithm can significantly recover the maximum and average value of the slope,but the mean square error and relative standard error were 23.5°and 49.85°,respectively;It is almost the same as the unchanged image,so the method just changed the statistical feature of the image.The topography recovery ability of the method needed to be further improved.
出处
《水土保持研究》
CSCD
北大核心
2013年第6期97-101,共5页
Research of Soil and Water Conservation
基金
国家自然科学基金(41171222)
中国科学院西部行动计划项目(KZCX2-XB3-09)
国家科技支撑计划课题(2011BAD31B03)
关键词
坡度变换
精度评价
直方图匹配
DEM
correction slope
accuracy assessment
histogram matching
DEM
