What LiDAR sees
Airborne laser pulses sample the ground through gaps in vegetation. Filtering creates terrain models that expose mounds, channels, banks, roads and depressions. LiDAR identifies shape; it does not date features or identify their builders by itself.
A city beyond the temples
The 2012 survey mapped a formally planned landscape integrated with major temples. Angkor Wat and Angkor Thom belonged to a wider system of neighbourhoods, fields, roads and waterworks.
Water at two scales
Beyond giant reservoirs and canals, LiDAR exposed thousands of local ponds and channels. Semi-automated analysis mapped more than 3,000 cisterns in central Angkor.
How large was it?
Integrated mapping documented a low-density settlement landscape exceeding 1,000 square kilometres within a study region approaching 3,000 square kilometres. It was spatially enormous, not densely built like a modern city.
Decline and limits
The maps support a systems view in which infrastructure, land use, maintenance and climate variability interacted. They do not prove that one drought or one hydraulic failure caused a sudden collapse.
Research record
Evans et al. (2013), Angkor LiDARHanus & Evans (2016), pond mappingEvans et al. (2007), Greater Angkor mapEvans & Fletcher (2015), Angkor Wat landscapeAn urban system, not a fantasy city
Direct answer: LiDAR revealed planned neighbourhoods, roads, embankments, canals, reservoirs, ponds and extensive landscape modification. Angkor was a dispersed low-density city on an enormous scale—not one sealed stone city hidden intact beneath jungle.
The breakthrough was scale and connection: temples, residences, agriculture and water infrastructure formed one modified landscape. Remote sensing finds patterns; archaeology explains them.