A series of small- to intermediate-sized spacecraft that is the centerpiece of NASA's Earth Science Enterprise (ESE). Planned for launch beginning in 1999, each of the EOS spacecraft will carry a suite of instruments designed to study global climate change. ESE will use space-, aircraft-, and ground-based measurements to study our environment as an integrated system. Designing and implementing the ESE is, of necessity, an international effort. The ESE program involves the cooperation of the U.S., the European Space Agency (ESA), and the Japanese National Space Development Agency (NASDA). The ESE program is part of the U.S. interagency effort, the Global Change Research Program.

NASA's Earth Observing System Data and Information System (EOSDIS) is a key core capability in the Earth Science Data Systems (ESDS) Program. It provides end-to-end capabilities for managing NASA Earth science data from various sources—satellites, aircraft, field measurements, and various other programs. For the EOS satellite missions, EOSDIS provides capabilities for command and control, scheduling, data capture and initial (level 0) processing. These capabilities, constituting the EOSDIS Mission Operations, are managed by NASA's Earth Science Mission Operations (ESMO) Project. 

The remaining capabilities of EOSDIS constitute the EOSDIS Science Operations, which are managed by NASA's Earth Science Data and Information System (ESDIS) Project. These capabilities include: generation of higher level (levels 1-4) science data products for EOS missions; and archiving and distribution of data products from EOS and other satellite missions, as well as aircraft and field measurement campaigns. The EOSDIS science operations are performed within a distributed system which includes Science Investigator-led Processing Systems (SIPS) and distributed, discipline-specific, Earth science Distributed Active Archive Centers (DAACs). 

NASA's Earth Science Data and Information System (ESDIS) Project is a part of NASA's Earth Science Projects Division under the Flight Projects Directorate at NASA's Goddard Space Flight Center. ESDIS manages the science systems of NASA's Earth Observing System Data and Information System (EOSDIS). 

See Earth Observing System Data and Information System (EOSDIS)

Each type of science data collected by an instrument aboard a satellite supported by the ECS is given a data type name to be stored or archived in the ECS inventory (e.g., MISR001.) ESDTs also define the Services which can be applied to the data and the metadata associated with the data. In addition, ESDTs are defined for all data referenced in the ECS inventory and this includes some non-satellite data, and some non-instrument data (e.g., science software archive packages, algorithm packages, pge tar files, and delivered algorithm packages).

NASA's Earth Science Mission Operations (ESMO) Project is responsible for spacecraft maintenance and operations for Earth Science missions conducted by NASA's Earth Science Projects Division at NASA's Goddard Space Flight Center. ESMO plays a significant role during the mission life cycle; from the formulation and approval phases through the implementation and evaluation phases, and eventual deactivation. 

The Project's role is to ensure the health and safety of the missions it manages by fulfilling the primary operational requirements for each mission, and providing the scientific community with high-quality data products in a timely manner. It also serves as a focal point for the mission on-orbit operations and the definition of support services required.

Data which describe the physical condition and operation of the platform and instruments on the platform. Parameters might include temperatures at specific points, filter(s) in use, switch settings, memory data, etc.

The infrastructure which provides NASA's Earth Observing System (EOS) and other U.S. and international scientists a broad range of desktop services from NASA's discipline-specific Distributed Active Archive Centers (DAACs). The ECS infrastructure also supports exchange of data and research results within the science community, across multiple agencies and internationally. ECS is the evolutionary base for accelerating the pace of Earth science research.