Methane emissions have major impacts on atmospheric composition and radiative forcing of climate change. The MethaneSAT satellite, and its companion aircraft instrument, MethaneAIR, are new imaging spectrometers intended to contribute in a major way to solving this important problem. MethaneSAT will provide measurements on regional scales (~200 x 200 km) with high spatial resolution (~130 m x 450 m) and precision, while MethaneAIR has a swath width of 4.5 km and pixel size of 5 x 25m. The missio