Principles and methods for the validation of quantitative remote sensing products

We first discuss the relativity of “true value and homogeneity” for quantitative remote sensing products (QRSPs), and then propose the definitions of “eigenaccuracy” and “eigenhomogeneity” under practical conditions. The eigenaccuracy and eigenhomogeneity for land surface crucial parameters such as...

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Bibliographic Details
Published in:Science China. Earth sciences 2010-05, Vol.53 (5), p.741-751
Main Authors: Zhang, RenHua, Tian, Jing, Li, ZhaoLiang, Su, HongBo, Chen, ShaoHui, Tang, XinZhai
Format: Article
Language:English
Subjects:
Albedo
Algorithms
Earth and Environmental Science
Earth Sciences
Fractal analysis
Fractals
Homogeneity
Land
Mathematical models
Pixels
Remote sensing
Remote sensing systems
Research Paper
Retrieval
Surface temperature
Validation studies
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Summary:We first discuss the relativity of “true value and homogeneity” for quantitative remote sensing products (QRSPs), and then propose the definitions of “eigenaccuracy” and “eigenhomogeneity” under practical conditions. The eigenaccuracy and eigenhomogeneity for land surface crucial parameters such as albedo, leaf area index (LAI), and surface temperature are analyzed based on a series of experiments. Secondly, we point out the differences and similarities between the scale-free phenomena of the QRSPs and the measurements of the coastline length (1-dimensional) and the curved surface area (2-dimensional). An information fractal algorithm for the QRSPs is presented. In a case study for the LAI, when the fractal dimension is 2.16, the ratio of the LAI retrieval values obtained respectively from remote sensing data of 30 m and 6 km pixel resolution can actually reach as high as 2.86 for the same 6 km pixel using the same retrieval model. Finally, we propose an operational validation method “one test and two matches” and multipoint observation when the real situation does not allow carrying out scanning measurement without gap and overlap on the ground surface.
ISSN:1674-7313
1869-1897
DOI:10.1007/s11430-010-0021-3