EOS Algorithm Theoretical Basis Documents (ATBDs)
Algorithm Theoretical Basis Documents (ATBDs) were developed for all EOS (Earth Observing System)-era instrument products, although some ATBDs address more than one product, and some products are addressed by more than one ATBD. ATBDs typically provide the theoretical basis, both the physical theory and the mathematical procedures and possible assumptions being applied, for the calculations that have to be made to convert the radiances received by the instruments to geophysical quantities. The geophysical quantities are then available to the scientific community for studies of the various characteristics of the Earth system.
All ATBDs are now archived along with their respective data products on the NASA Earthdata website.
