0309 GMT February 20, 2018
But the latest discovery — one archeologists are calling a ‘game changer’ — didn't even require a can of bug spray, washingtonpost.com wrote.
Scientists using high-tech, airplane-based lidar mapping tools have discovered tens of thousands of structures constructed by the Maya: Defense works, houses, buildings, industrial-size agricultural fields, even new pyramids. The findings, are already reshaping long-held views about the size and scope of the Maya civilization.
“This world, which was lost to this jungle, is all of a sudden revealed in the data,” said Albert Yu-Min Lin, an engineer and National Geographic explorer who worked on a television special about the new find.
“And what you thought was this massively understood, studied civilization is all of a sudden brand new again,” he told the New York Times
Thomas Garrison, an archeologist at Ithaca College who led the project, called it monumental: “This is a game changer,” he told NPR. It changes “the base level at which we do Maya archaeology.”
The findings were announced by Guatemala's Mayan Heritage and Nature Foundation, which has been working with the lidar system alongside a group of European and US archeologists.
The lidar system fires rapid laser pulses at surfaces — sometimes as many as 150,000 pulses per second — and measures how long it takes that light to return to sophisticated measuring equipment.
Doing that over and over again lets scientists create a topographical map of sorts. Months of computer modeling allowed the researchers to virtually strip away half a million acres of jungle that has grown over the ruins. What's left is a surprisingly clear picture of how a 10th-century Maya would see the landscape.
Scientists used similar scans to unearth a network of ancient cities in Angkor, the heart of the Khmer empire in Cambodia that includes the famed Angkor Wat, according to the Times. Lidar has the potential to unearth civilizations even in the densest jungles of Brazil.
And Garrison said the lidar data can be used in other fields.
“We don't use about 92 percent of the lidar data. We just throw it out to make our maps," he told The Washington Post.
"But there is incredibly valuable information in that forestry data. You’re just seeing the archeology part because that's what we focused on, but that data can be used to determine how jungles recover from forest fires, what's the carbon footprint."
Still, that eight percent of data was as astonishing as it was humbling, he said.
The planes that shot lidar pulses at pieces of the Guatemalan jungle did so in a matter of days, Garrison said. It unearthed Maya structures researchers had literally walked over before, including a temple they thought was a hill.
“There was this fortress in our area,” Garrison told The Washington Post.
“In 2010, I was within 150 feet of this thing, which would have been a massive discovery in 2010."
Using the data, researchers have been able to refine their thoughts about Maya civilization.
According to the Associated Press, researchers now believe that as many as 10 million people may have lived in the area known as the Maya Lowlands — two or three times as many as scientists had thought. And because all those people needed to eat, in some areas, 95 percent of available land was drained — including areas that have not been farmed since the Maya fell.
“Their agriculture is much more intensive and therefore sustainable than we thought, and they were cultivating every inch of the land,” Francisco Estrada-Belli, a research assistant professor at Tulane University, told the AP.
During the Maya classic period, which stretched from A.D. 250 to 900, the civilization covered an area twice the size of medieval England, according to National Geographic, and was much more densely populated.
“Most people had been comfortable with population estimates of around five million,” said Estrada-Belli, who directs a multidisciplinary archaeological project at Holmul, Guatemala.
“With this new data, it’s no longer unreasonable to think that there were 10 to 15 million people there — including many living in low-lying, swampy areas that many of us had thought uninhabitable.”
Lidar revealed a previously undetected structure that Garrison said “can’t be called anything other than a Maya fortress.”
That and other newly discovered fortresses indicate that the Maya may have been involved in more conflict — even outright warfare — than previously believed, and at earlier points in history.