Sudden impact was recent, too
Globe and Mail (Free subscription) | 26/11/2008
... see the entire crater on satellite images, but it was covered with too many aspen trees and shrubs.Duane Froese, an assistant professor in the department of earth and atmospheric sciences, suggested they try LiDAR, a remote-sensing technology that uses laser light bounced from the Earth's surface.Using LiDAR data, they created an image of the area without any vegetation. It revealed...
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