<P> Lidar uses ultraviolet, visible, or near infrared light to image objects . It can target a wide range of materials, including non-metallic objects, rocks, rain, chemical compounds, aerosols, clouds and even single molecules . A narrow laser beam can map physical features with very high resolutions; for example, an aircraft can map terrain at 30 - centimetre (12 in) resolution or better . </P> <P> The essential concept of Lidar was originated by EH Synge in 1930, who envisaged the use of powerful searchlights to probe the atmosphere . Indeed, Lidar has since been used extensively for atmospheric research and meteorology . Lidar instruments fitted to aircraft and satellites carry out surveying and mapping--a recent example being the U.S. Geological Survey Experimental Advanced Airborne Research Lidar . NASA has identified lidar as a key technology for enabling autonomous precision safe landing of future robotic and crewed lunar - landing vehicles . </P> <P> Wavelengths vary to suit the target: from about 10 micrometers to the UV (approximately 250 nm). Typically light is reflected via backscattering, as opposed to pure reflection one might find with a mirror . Different types of scattering are used for different lidar applications: most commonly Rayleigh scattering, Mie scattering, Raman scattering, and fluorescence . Suitable combinations of wavelengths can allow for remote mapping of atmospheric contents by identifying wavelength - dependent changes in the intensity of the returned signal . </P> <Table> <Tr> <Td> </Td> <Td> This section needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (April 2017) (Learn how and when to remove this template message) </Td> </Tr> </Table>

What is the most common wavelength user for lidar
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