Fast and Accurate Retrieval of Methane Concentration From Imaging Spectrometer Data Using Sparsity Prior. - Markus D. Foote; Philip E. Dennison; Andrew K. Thorpe; David R. Thompson 001; Siraput Jongaramrungruang; Christian Frankenberg; Sarang C. Joshi (IEEE Trans. Geosci. Remote. Sens., 2020)