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DOI | 10.1029/2018JD029937 |
Direct Comparison and Triple Collocation: Which Is More Reliable in the Validation of Coarse-Scale Satellite Surface Albedo Products | |
Wu, Xiaodan1,2; Xiao, Qing2,3; Wen, Jianguang2,3,4; You, Dongqin2,3 | |
2019-05-27 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
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ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2019 |
卷号 | 124期号:10页码:5198-5213 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China |
英文摘要 | A rigorous and reliable validation is the prerequisite and basis to properly understand the accuracy of satellite surface albedo products. However, the representativeness error of point scale in situ measurements, which mainly results from the spatial mismatch between in situ and satellite measurements as well as the surface heterogeneities, generally hinders an effective validation of satellite surface albedo products based on the conventional direct comparison method. Triple collocation technique has been recognized as a powerful tool to estimate the errors of satellite products without requiring the truth. Here, we evaluated the effectiveness of both the direct comparison and extended triple collocation (ETC) methods in tackling with the representativeness error of in situ measurements and characterizing the performances of satellite surface albedo products (MCD43A3 [V006], GLASS, and NPP VIIRS albedos) given whether the in situ-based pixel-scale albedo was available or not. The ETC method is shown to be advantageous over the direct comparison based on single point in situ measurements, because it is less affected by representativeness errors. However, it shall not substitute for the direct comparison method based on in situ-based pixel-scale albedo measurements, because its effectiveness in solving representativeness errors and estimating product errors is very limited and dependent on the choice of the data in the triplets. Furthermore, the ETC technique cannot be used to estimate the true physical errors of satellite surface albedo products. |
英文关键词 | Validation albedo heterogeneity representativeness errors spatial scale ETC |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000471237200004 |
WOS关键词 | SOIL-MOISTURE ; IN-SITU ; MODIS ; ERRORS ; REFLECTANCE ; RETRIEVALS ; ALGORITHM ; BRDF |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/183337 |
专题 | 气候变化 |
作者单位 | 1.Lanzhou Univ, Coll Earth & Environm Sci, Lanzhou, Gansu, Peoples R China; 2.Chinese Acad Sci, Inst Remote Sensing & Digital Earth, State Key Lab Remote Sensing Sci, Beijing, Peoples R China; 3.Univ Chinese Acad Sci, Beijing, Peoples R China; 4.JCGCS, Beijing, Peoples R China |
推荐引用方式 GB/T 7714 | Wu, Xiaodan,Xiao, Qing,Wen, Jianguang,et al. Direct Comparison and Triple Collocation: Which Is More Reliable in the Validation of Coarse-Scale Satellite Surface Albedo Products[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2019,124(10):5198-5213. |
APA | Wu, Xiaodan,Xiao, Qing,Wen, Jianguang,&You, Dongqin.(2019).Direct Comparison and Triple Collocation: Which Is More Reliable in the Validation of Coarse-Scale Satellite Surface Albedo Products.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,124(10),5198-5213. |
MLA | Wu, Xiaodan,et al."Direct Comparison and Triple Collocation: Which Is More Reliable in the Validation of Coarse-Scale Satellite Surface Albedo Products".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 124.10(2019):5198-5213. |
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