Surrey council uses laser mapping for flood alleviation
Surrey Heath Borough Council has turned to airborne laser mapping to help flood alleviation works on Chobham Common, one of the largest National Nature Reserves in the South-east. The LiDAR data from Bluesky has been captured using aircraft-mounted sensors to provide centimetre accurate land elevation data.
Using the Bluesky data Surrey Heath has identified the potential to reinstate some medieval ponds and hopes to attenuate flood water coming off the common into nearby villages in this area of the London green belt.
James Rutter, GIS manager at Surrey Heath Borough Council, said: “I’ve not actually used LiDAR data before but am extremely impressed with the quality, density, coverage and accuracy of the height data. I have also been impressed with the service and support from Bluesky.
“Using the data we have been able to run a watershed analysis on this hugely important and sensitive site.”
The Surrey Heath data was captured using Bluesky’s state of the art airborne mapping system. The LiDAR (Light Imaging Detection and Ranging) system uses aircraft mounted lasers to accurately determine the distance between the sensor and the ground or other targets such as buildings and vegetation.
Bluesky uses an Optech Orion M300, the highest specification instrument being operated from a UK base. This allows for the capture of LiDAR data at a higher point density and at a better accuracy than other systems due to an increased pulse repetition rate. The system also includes the latest available technology in global positioning and inertial measurement for improved accuracy sensor positioning.
The Bluesky system is also fully integrated with a photogrammetric survey camera (the CS-10000) and a thermal infra-red imaging system (the CS-LW640), to allow the simultaneous capture of truly co-registered data where required.
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