Algorithm Theoretical Basis Documents (ATBDs) have been developed for EOS 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.
NOTE: All ATBDs accessible through these links are subject to revision. These are the latest versions currently available.
| Active Cavity Radiometer for Irradiance Monitoring |
| Atmospheric Infrared Sounder |
| Advanced Microwave Scanning Radiometer |
| Advanced Spaceborne Thermal Emission and Reflection Radiometer |
| Clouds and Earth's Radiant Energy System |
| Geoscience Laser Altimeter System |
| High-Resolution Dynamics Limb Sounder |
| Light Imaging Sensor |
| Multi-angle Imaging Spectroradiometer |
| Microwave Limb Sounder |
| Moderate-Resolution Imaging Spectroradiometer |
| Measurements of Pollution in the Troposphere |
| Ozone Monitoring Instrument |
| Stratospheric Aerosol and Gas Experiment |
| Microwave Radar Instrument |
| Solar Radiation and Climate Experiment |
| Tropospheric Emission Spectrometer |
| Data Assimilation Office |
| Advanced Microwave Sounding Unit-A |
| Humidity Sounder for Brazil |
| Global Positioning System Receiver |
| High-Accuracy Inter-satelitte Ranging System |
| Star Camera Assembly |
| SuperStar Accelerometer |
| Ultra Stable Oscillator |
| Jason Microwave Radiometer |
| TurboRogue Space Receiver |
| Laser Retroreflector Array |
| Doppler Orbitography and Radiopositining Integrated by Satellite |
| Enhanced Thematic Mapper Plus |
| Global Imager |
| Improved Limb Atmospheric Spectrometer 2 |
| Polarization and Directionality of the Earth's Reflectance |
| Advanced Land Imager |
| Sea-viewing Wide Field-of-view Sensor |
| Total Ozone Mapping Spectrometer |
| Total Irradiance Monitor |
| Spectral Irradiance Monitor |
| Solar StellarIrradiance Comparison Experiment |
| XUV Photometer System |
| Visible Infrared Scanner |
| TRMM Microwave Imager |
| Precipitation Radar |
| L-Band Radiometer |
| L-Band Scatterometer |
| Cloud Aerosol Lidar with Orthoginal Polarization |
| IR Imager |
| Wide Field Camera |
| Cloud Profiling Radar |
| Advanced Technology Microwave Sounder |
| Orbiting Carbon Observatory |
| Aerosol Polarimetry Sensor |
| Dual frequency Precipitation Radar |
| GPM Microwave Imager |
| Cross-Track Infrared Sounder |
| Ozone Mapping and Profiler Suite |
| Visible/Infrared Imager/Radiometer Suite |
| Active Cavity Radiometer Irradiance Monitor |
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| Operational Line Imager |
