Ground-penetrating radar is being used by Indigenous communities to pinpoint unmarked graves near former residential school sites. Here’s everything you need to know about the technology behind these discoveries. | CBC News

Ground Penetrating Radar (GPR) explained (and its limits) GPR 101: reflections, not x-ray. Clay is the enemy. 📡🧱 Tom breaks down GPR: it sends a radio pulse; you read time-based reflections. In dry sand it sings; in wet clay (hello, Melbourne) signals dissipate. You don’t “see a pipe,” you read a strong arc/reflection and interpret. Today’s pass = no convincing reflections in the rear strip—another clue the “easement” is inactive. Developer Tip (get reliable GPR reads): • Combine GPR EM locati