Recently, associate professor Xiaodan Wu from the College of Earth and Environmental Sciences, Lanzhou University, published an important article titled " Advances in quantitative remote sensing product validation: overview and current status " in the journalEarth-Science Reviews (IF=9.53), a top international journal of Earth Science. Associate professor Wu is the first author of the article and the College of Earth and Environmental Sciences is the primary institution. This article is a systematic summary of the previous research results on the validation of the quantitative remote sensing product and discusses how to validate remote sensing products.

Firstly, in this paper, a series of the theories and approaches of the validation were systematically analyzed, including ground temporospatial optimized sampling, upscaling methods, verification method and evaluation method. Then, she pointed out the current problems of validation, including the bottleneck of principles and approaches, the treatment of ground heterogeneity, the difficulty of truth-value estimation in the pixel scale, the validation for mountain remote sensing products, and the uncertainty analysis in the validation process. Finally, the development trend of quantitative remote sensing product validation was forecasted, including the improvement of validation methodology, the expression of validation results, the collection of ground test data, and the establishment of web-based remote sensing product validation system.

The validation of remote sensing products is the driving force to promote the development of remote sensing science, and a critical process to promote the application of remote sensing products. The research results are helpful to the knowledge of the validation.