The most commonly used sampling strategy was the use of LIDAR. Light Detection and Ranging, or LIDAR, is a remote sensing method that uses light in the form of a pulsed laser to measure ranges to the Earth.
The excavation team took daily helicopter flights for almost two weeks over a 370-square-kilometer area around the temple. The LIDAR device fired a million laser beams every four seconds through the jungle canopy, recording minute variations in ground surface topography. With the findings, researchers could d draw a picture of city blocks, residential areas, dried-out pounds, and other archaeological remains.
Tree ring samples were also taken to record sudden fluctuations between extreme dry and wet conditions- and they were also used to reveal catastrophic flood damage to the city’s vital water network.