Direct validation of MODIS spectral Abledo product with field measurement

Abstract

Land surface albedo is a key input parameter required in the current general circulation models (GCMs). The accurate validation of albedo products is very important for use in various applications by the scientific community. The most common validation methods compare motely sensed albedo products directly with ground-based observed broadband albedo values without considering the band width inconsistency and the narrow-to-broad band transformation error of these products. Unlike previous validation approaches, we propose a spectral albedo direct validation method. By applying the novel instrument of multi-band albedometer, it is possible to obtain MODIS visible and near-infrared bands albedo measurements. The in-field measured data combined with a 16-day interval is compared directly with MODIS narrow band albedo products. The results indicate that the multi-band albedometer measurement and the MODIS narrow band white and black sky albedo has a good consistency. It is an efficient way to get rid of the errors induced by the band conversion and is a labor-saving technique of making possible time series measurements.