Croplands are considered to have large CO2 offset capacity. However, it is highly uncertain how much CO2 stabilization can be achieved through land management strategies. This project focuses on developing a monitoring system by integrating satellite-derived crop specific characterization of vegetation and management, commercial-off-the-shelf (COTS) ancillary spatial databases and the RS-EPIC model to estimate seasonal and annual carbon cycle components including net primary production (NPP), net ecosystem productivity (NEP), and net ecosystem carbon balance (NECB). These estimates will be produced for corn, soybean, wheat, cotton, and rice crops grown in the conterminous US at a spatial resolution of 500 m for 2015-2016.