Lidar (also written LIDAR or LiDAR) is a remote sensing technology that measures distance by illuminating a target with a laser and analyzing the reflected light. Although thought by some to be an acronym of Light Detection And Ranging, the term lidar was actually created as a portmanteau of "light" and "radar." (http://en.wikipedia.org/wiki/Lidar)
Lidar is popularly used as a technology to make high-resolution maps, with applications in geomatics,archaeology, geography, geology, geomorphology, seismology, forestry, remote sensing, atmospheric physics, airborne laser swath mapping (ALSM), laser altimetry, and contour mapping. (http://en.wikipedia.org/wiki/Lidar)
LiDAR projects and data across the state:
West TN NRCS 2012 LAS
Tipton NRCS 2013 DEMs
Tipton NRCS 2013 LAS
West TN 2015 LAS files (Fayette, Hardeman, McNairy ) Each county zip has zlas files, break lines, tile index and metadata included.