Lidar mapping has been around for many years, it will appeal to many metal detectorists as it is now becoming a very important method of unlocking hidden parts of our history, Lidar is an aerial mapping technology in which laser beams are reflected from the earths surface to an overflying aircraft equipped with on-board GPS and IMU sensors. After analysis the acquired data determines the precise elevation and location of terrestrial objects and man-made features.
LiDAR is an accurate and effective method for creating three-dimensional topographical aerial maps and highly accurate surveys
LIDAR systems allow scientists and mapping professionals to examine both natural and manmade environments with pin point precision, and can help make digital elevation models for use in geographical information systems, to assist in emergency response teams, mapping, archaeology and in many other applications.
English Heritage (now Historic England) recognised the potential for lidar to record very slight earthwork remains and contracted the Environment Agency Geomatics Group to fly a survey of Stonehenge
Since then they have worked with a number of lidar providers looking at different areas of the country with extreme levels of success.
Here is the link
Historic England and Lidar mapping
Lidar is going to be the future of metal detecting research
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