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Lidar (/ ˈ l aɪ d ɑːr /, also LIDAR, an acronym of "light detection and ranging" [1] or "laser imaging, detection, and ranging" [2]) is a method for determining ranges by targeting an object or a surface with a laser and measuring the time for the reflected light to return to the receiver.
The camera is positioned hundreds of meters away from the (usually vertically-pointed) laser beam. The geometry of the CLidar is shown in the figure. It is important in the analysis that the optics, the wide-angle lens in this case, accurately maps equal angles onto an equal number of pixels throughout the 100 degree field-of-view.
Atmospheric lidar is a class of instruments that uses laser light to study atmospheric properties from the ground up to the top of the atmosphere. Such instruments have been used to study, among other, atmospheric gases, aerosols, clouds, and temperature.
PARASOL (Polarization & Anisotropy of Reflectances for Atmospheric Sciences coupled with Observations from a Lidar) was a French-built Earth observing research satellite. It carried an instrument called POLDER which studied the radiative and microphysical properties of clouds and aerosols .
Time of flight of a light pulse reflecting off a target. A time-of-flight camera (ToF camera), also known as time-of-flight sensor (ToF sensor), is a range imaging camera system for measuring distances between the camera and the subject for each point of the image based on time-of-flight, the round trip time of an artificial light signal, as provided by a laser or an LED.
Pages in category "Lidar" The following 26 pages are in this category, out of 26 total. This list may not reflect recent changes. ...
The flash lidar flashes a laser and acts like a flash camera permitting the generation of lidar maps and images. [10] The Doppler lidar measures the vehicle's altitude and velocity to precisely land on the surface, and the high-altitude laser altimeter provides data enabling the vehicle to land in the chosen area. [10]
[2] [3] The digital camera is able to operate at exposures as short as 1/4000 sec, eliminating motion blur for images acquired at typical ground velocities of 110 knots. To gather elevation data, Buckeye uses an Optech ALTM 3100 (Airborne Laser Terrain Mapper) LIDAR sensor system, which emits a laser pulse and records the time it takes for the ...