Social cartography and satellite-derived building coverage for post-census population estimates in difficult-to-access regions of Colombia by Sanchez-Cespedes, LM, Leasure, DR, Tejedor-Garavito, N, Amaya Cruz, GH, Garcia Velez, GA, Mendoza, AE, Marín Salazar, YA, Esch, T, Tatem, AJ, Ospina Bohórquez, M