Ngo, K., Nghiem, S., Lechner, A., & Vu, T. (2021). Building Structure Mapping on Level Terrains and Sea Surfaces in Vietnam. Remote Sensing, 13(13), 2439. https://doi.org/10.3390/rs13132439 : Also see https://esdresearch.nasa.gov/result/building-structure-mapping-level-terrains-and-sea-surfaces-vietnam