The image shown above is an example of a sonar image. Sonar images are taken the same way radar and lidar images are, but instead uses sound waves to capture images. They are ideal for submariners and boats, as they are good for underwater imaging. The image above depicts a boat that is using sonar to see the nearby underwater terrain, both its elevation and topography. The map uses color to distinguish higher and lower depths. The blue is lower depth and the red is higher depths, which are the ones the boater will probably more concerned with.
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