水土流失定量监测中的DEM精度评价新方法  

NEW METHOD FOR ACCURACY EVALUATION OF DEM

作　　者：卜兆宏[1] 杨晓勇[2] 王库[1] 杨林章[1] 张祖兴[2] 朱克诚[3] 钱惠康[3] 

机构地区：[1]中国科学院南京土壤研究所,南京210008 [2]水利部海河水利委员会科技咨询中心,天津300170 [3]江苏省水利厅水土保持办公室,南京210029

出　　处：《土壤学报》2004年第5期661-668,共8页Acta Pedologica Sinica

基　　金：国家自然科学基金 (No .40 1710 60 );中国科学院知识创新工程项目 (KZCX2 413 )资助

摘　　要：提出了由像元坡度评价法和数值评价法组成的DEM精度评价新方法 ,介绍了它在两类DEM实验区应用的结果 ,显示了它在DEM精度评价中具有准确可靠、快速直观、评价客观、精度数值符合DEM实际的特点 ,并能醒目突显DEM的局部错误 ,使其能用DEM构建文件改正后建成较高精度的DEM。该评价新方法 ,已在江苏全省和密云水库流域DEM建成中得到充分应用和证明。A new method was proposed to evaluate the accuracy of DEM by combining the pixel slope evaluation method with numerical value evaluation method. Results obtained from two types of DEM experiment sites, the Miyun Reservoir in Beijing and Jiangsu Province showed that the new method for DEM evaluations was characterized by credibility, accuracy, quickness, intuitiveness, and objectivity, and could quickly turn out a precise DEM after correcting a few mistakes in general imaginary of DEM. The accurate values are true to the reality. Since the method can make errors standing out in DEM and hence easy to correct, it is very useful to work out a precise, intuitionistic and actual DEM. The new method has been fully proved in establishing DEM of Jiangsu Province and the upstream region of the Miyun Reservoir in the Haihe watershed.

关 键 词：水土流失 定量监测 DEM精度 评价方法 

分 类 号：S157.1[农业科学—土壤学]