I figured lidar was overhyped for finding sites until a guy showed me the same hill in Guatemala before and after

Sean Gibson · 2026-10-07T14:10:04.61531+00:00

I used to think lidar was just a fancy way for universities to burn grant money and make pretty 3D maps. Then last month a friend who does survey work showed me two images of the same patch of jungle in Peten, Guatemala, and I just sat there staring. The first was the satellite view everyone has seen for years, just green canopy, nothing to see, and that spot had been written off as empty for decades. The second was the same hill after they stripped away the trees with lidar, and there were something like 60,000 house platforms, causeways, and defensive walls hiding under all that green. What got me was the timeline, because the flyover happened in 2016 and it took a few years before the ground crews actually walked in and matched the shapes to real stone. The part that really flipped me was how the walls lined up with the roads in a way that no one had guessed from digging alone, it was all sitting right there the whole time. I still think lidar gets oversold for small stuff like spotting a single farmstead, but for whole landscapes it is not even close. Has anyone here worked with lidar data directly, and how bad is the false positive problem when you try to pick out smaller features?

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I figured lidar was overhyped for finding sites until a guy showed me the same hill in Guatemala before and after | Archaeology Discoveries - Topic Shares