GPS World, January 2016
WATCH MARKET MAPPING 2 Capturing lidar data Lasers from the survey aircraft are transmitted to the ground The time taken for the beam to be bounced back to aircraft mounted receivers is recorded Using the known position of the aircraft the time taken for the return of the laser beam and the known value of the speed of light the distance between the aircraft and ground is calculated Readings can also be taken to determine the height of vegetation and other surface structures Survey Lasers in on Iron Age Archaeology H igh tech aerial laser survey i n g i s b e i n g employed to reveal the hidden archaeology of an Iron Age hill settlement in Lancashire England Visually the archaeological features are difficult to see but a Bluesky laser survey commissioned by the Morecambe Bay Partnership is expected to reveal previously undiscovered details of a settlement at Warton Crag Identified as an important Heritage at Risk site the site has already been subject to low level archaeological investigations which have identified remains from a small well defended hill fort It is imperative that we get a better definition of the archaeological remains that are currently hidden by the dense vegetation cover said Louise Martin H2H cultural heritage officer at the Morecambe Bay Partnership This will enable us to develop conservation strategies for the site and work towards reducing the risk to the archaeological remains The site is currently on Historic Englands at risk register so this work is crucial in developing partnerships and strategies to protect the monument for future generations The Bluesky lidar system uses lasers to accurately measure the 50 GPS WORLD WWW GPSWORLD COM JANUARY 2016 earths terrain and record features on the ground in 3D A dedicated survey plane is equipped with aerial photography equipment and will fly over the site during the winter months when the tree and canopy cover is at its minimum Bluesky will process the millions of individual laser measurements to create detailed 3D computer models of the Earths relief a Digital Terrain Model DTM and ground surface including buildings and vegetation a Digital Surface Model DSM This will allow the Morecambe Bay Partnership to model scenarios and strategies and share information with project partners
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