How ground-penetrating radar works, what its limitations are and what you need to know about the technology.
She says the unit itself looks like a box, roughly the size of a toaster oven, which is usually attached to a cart that someone pushes along the ground.
Supernant says there are methods for figuring out what an anomaly might be. And certain objects, like rocks or metal, have distant signatures.“When you dig a grave, you disturb the soil ⦠and ground-penetrating radar can sometimes detect that change in the soil from the digging of the grave itself.”Supernant says her team is also guided by elder testimony and community knowledge to help identify where to search, as the areas where graves may be no longer have markers.
In terms of physical evidence, Supernant says there can sometimes be impressions left on the land itself, but in order to confirm the existence of remains, “you need to do something below the surface.” Supernant says there are two main misconceptions about the technology and its role in searches: “On the one hand there’s an overstatement, and then on the other hand, there’s an undermining.”
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