Using the high-resolution airborne LiDAR data, archaeologists have found extensive systems of sophisticated irrigation and terracing in and outside the ancient settlements of three Classic-period Maya kingdoms — Piedras Negras, La Mar, and Lacanja Tzeltal — in the Upper Usumacinta River basin of Mexico and Guatemala. Regional map showing extent of LiDAR survey and location of Classic period Maya capitals. Image credit: Golden et al., doi:...
