摘要
采用基于GIS的非累计流量的坡长直接提取算法(NCSL)和空间分析提取法(SAC)对陕北省安塞县10个样区的坡长进行提取,并计算相应的坡长因子。对不同DEM分辨率下的坡长提取结果对比,结果表明:NCSL对坡长的提取精度明显好于SAC的提取结果,其中DEM在5、10 m分辨率下的提取精度最好,且二者计算的坡长因子值差异不大,因此,可采用10 m分辨率NCSL方法提取坡长。
In this research,non-cumulative slope length（ NCSL） calculation method and spatial analytical calculation（ SAC） method were respectively applied to extract slope length and slope-length factor from 10 sample areas,which were located in Ansai County,north Shaanxi Province. The comparison of computation precision among variable DEM resolutions showed that NCSL was superior to SAC entirely. And the results were best when DEM resolutions was 5 m and 10 m; besides,the result of slope-length factor was nearly the same under the same condition. So DEM of 10 m resolution can be used to extract slope-length.
出处
《安徽农业科学》
CAS
2017年第29期104-108,123,共6页
Journal of Anhui Agricultural Sciences
基金
中国气象局气象软科学重点项目"基于综合风险防范视角的中国及周边国家安全和全球战略研究"(2017[21])
中国气象局气象软科学自主项目"新常态下中国自然灾害风险时空格局和综合防灾减灾工作的现状
趋势
挑战及战略对策范式研究"(2017[36])
中国气象局气象软科学自主项目"中国气象灾害防御能力评估及政策建议"(2017[35])
关键词
DEM
分辨率
坡长
精度差异
土壤侵蚀模型
DEM
Resolution
Slope length
Precision differentiation
Soil erosion model
