LIDAR is a tool used on satellites for remote sensing. It is a form of active remote sensing, because in order to obtain the image the LIDAR emits wavelengths of a laser that are absorbed and reflected back to the sensor by the entities on the ground. Much like sonar and radar, it uses reflection time to see distance and can generate an image of the land below in a three-dimensional manner. This is a LIDAR image of Manhattan from September 27, 2001. If you look closely near the center of the photo, you can see the empty crater that is Ground Zero, where the World Trade Center fell just weeks before.
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