The National Polar-orbiting Operational Environmental Satellite System (NPOESS) will produce 54 environmental data products serving military and civil operational users and the science community, supporting the atmospheric, cloud, land, ocean/water, earth radiation budget, and space remote sensing disciplines. Data products that are key to operations included imager, atmospheric temperature and moisture profiling, sea surface temperature and wind speed/direction, and soil moisture. NPOESS exploits advanced sensor and data product development on the Earth Observing System (EOS) and other envirosats, including a predecessor mission, the NPOESS Preparatory Project (NPP). The NPOESS data products will be used in weather forecasting, operational decision making, and climate monitoring. The products are delivered with low latency following data acquisition on-orbit by using downlink to a globally distributed network. Synergistic interconnected processing of data products is used to improve quality and reliability. Because the NPOESS system will serve for many years, planning hgas included consideration of product improvements and long term measurement stability for support to climate monitoring.