How ground-penetrating radar is used to find unmarked graves at residential schools

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OTTAWA — Ground\u002Dpenetrating radar is the technology behind the discoveries of what are believed to be unmarked burial sites on the grounds of former…

But it is not well understood, and is being used to fuel misinformation about the findings.Sign up to receive daily headline news from the Calgary Herald, a division of Postmedia Network Inc.By clicking on the sign up button you consent to receive the above newsletter from Postmedia Network Inc. You may unsubscribe any time by clicking on the unsubscribe link at the bottom of our emails or any newsletter. Postmedia Network Inc.

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.”Article contentSupernant 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.”Article content

 

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