A. J. Mathews, A. E. Frazier, S. V. Nghiem, G. Neumann, and Y. Zhao, Satellite scatterometer estimation of urban built-up volume: Validation with airborne lidar data, Int. J. Appl. Earth Obs. Geoinformation, 77, 100-107, doi:10.1016/j.jag.2019.01.004, January 2019