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Archaeologists are finding more ancient cities and lost human settlements than ever before. And it's all thanks to new imaging technologies commonly used in surveillance. With highly-accurate measurements from satellites, drones, LiDAR, and more, archaeologists are making discoveries that were once impossible.

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InAmerica's space agency is going to send a laser into the galaxies to assess the world's trees. It won't be the first time NASA dabbles in lidar technology—shooting lasers onto things and recording what comes back—but it will be the first time the agency sends a laser specifically designed to measure the intricate structure of forests. The goal of the mission, fittingly named GEDI, an acronym for Global Ecosystem Dynamics Investigation lidar, is to map forests trunk to canopy—or, to put it another way, to measure the volume of the world's forests and visualize them in 3-D.

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Walking along the scrubby countryside of central Turkey, Compton Tucker — bandana draped over his head and under his straw hat — looks like he's hauling a pushmower back to a tool shed. But the boxy equipment that he's dragging isn't cutting down weeds, it's actually a kind of radar that can see underground. Like a beachcomber with a metal detector, Tucker and colleagues walk up to 10 miles 16 kilometers a day, seven days a week, across sweltering ancient Turkish archaeological grounds in search of bone fragments, pottery and tombs.

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Ground-penetrating radar GPR is a geophysical method that uses radar pulses to image the subsurface. GPR can have applications in a variety of media, including rock, soil, ice, fresh water, pavements and structures. In the right conditions, practitioners can use GPR to detect subsurface objects, changes in material properties, and voids and cracks.

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Many professional archaeologists claim that the greatest advancement in archaeology since the pick and shovel is Ground Penetrating Radar GPRotherwise known as remote sensing. GPR equips the specialist excavator with a tool that permits an ability to 'observe' the archaeological record without disturbing or excavating it. This type of data gathering can occur either from the air or the ground.

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California is running on groundwater right now. As the state has cut down on surface water deliveries from rivers and reservoirs, farmers and municipal water suppliers have reacted by sucking more and more out of Madre Earth. The state's land, in response, is sinking lower and lower, day by day, year by year.

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An open-source data platform recently launched by the European Space Agency ESA is enabling scientists to lift the lid on clouds, allowing for faster and more precise monitoring and mapping of changes to land use in tropical places where clouds are a persistent feature. In the ESA launched Sentinel-1Aa satellite that captures pictures of the Earth with radarusing pulses of microwave energy to penetrate all weather conditions and create images based on the returning signals. A main goal of scientists like Hewson: Understanding land-cover change.

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Not a MyNAP member yet? Register for a free account to start saving and receiving special member only perks. Because of the recognized value of these measurements and because techniques are ever improving, several nations plan further radar missions to observe the land surface. Many more airborne radar remote sensing instruments have been developed to conduct studies on a regional scale, or as platforms for demonstrating future spaceborne techniques.

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In the past decade there has been a quiet revolution in archaeology, virtually allowing archaeologists to see through the ground without digging. Advances in geophysics, soil chemistry and remote sensing are speeding up the discovery of ancient sites and helping archaeologists understand them on a global scale. Below is our list of the top six of these techniques.

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By Hazel Morris. In a first for radar sensing, researchers have shown the technology can locate and identify buried objects. Their technique could be used in the hunt for archaeological artefacts smothered by sand or networks of underground buildings, or even to peer below the surface of Mars. Many were startled when images from a shuttle mission in the s revealed what appeared to be ancient river drainage patterns below the eastern Sahara desert.

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