LIDAR

Light Detection and Ranging is similar to doppler, but utizes laser pulses vs. the microwaves of doppler. THis use of light provides increased speed and accuracy, as well as using much shorter wavelength light, therefore is less prone to distortion as it passes through the atmosphere. LIDAR provides such ultra accurate precision that is widely used in military application as a replacement for doppler.





Found - http://vulcan.wr.usgs.gov/Volcanoes/MSH/Eruption04/LIDAR/Images/LIDAR_msh_new_dome_area_09-03.jpg