Help! Quadrat Sampling

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Megan Fahey
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Help! Quadrat Sampling

I am a new user of ImageJ and I'm having trouble figuring out how to place a quadrat on a photo to sample hermit crab populations on the ocean floor. The pictures were taken on a GoPro camera, looking out at a sandy-bottom area instead of directly down at the area. Is there a way to overlay a quadrat so that it "goes into" the photo (2D?) if I have a point of reference inside the photo to set the scale.