Methodology and error budget for evaluating the MODIS-VIIRS land surface reflectance fundamental climate data record

摘要

The land surface reflectance is a fundamental climate data record at the basis of the derivation of other climate data records (Albedo, LAI/Fpar, Vegetation indices) and has been recognized as a key parameter in the understanding of the land-surface-climate processes. In this presentation, we present the validation of the Land surface reflectance used for MODIS and VIIRS data. This methodology uses the 6SV Code and data from the AERONET network. The overall accuracy clearly reaches the MODIS and VIIRS specifications. To understand how to improve the validation, we developed an exhaustive error budget. Results show an impact of the absorption of aerosol and of the fine mode volume concentration. At the end, we discuss about the interest of the indirect and direct method for validation.