2LiDAR = Light Detection and Ranging Airborne laser scanning – rapid high-density survey of Earth’s surface Accurate and reliable surveys, faster and with higher density than conventional surveys& gulfsci.usgs.gov
3How does LiDAR work? Simultaneously Consequently Measure trajectory of aircraft in three dimensionsMeasure orientation of laser scanner about three rotations axesTransmit and receive laser pulses, measure the time-of-flight (i.e. range to reflecting surface)ConsequentlyKnow the coordinates of 150,000 points surveyed per secondMap the surface of the Earth in high density
5CK Aerial Surveys – Specifications Point density – 15 to 60 points per m2 Vertical accuracy – 7 to 10 cm Horizontal accuracy – 5 to 7 cm in both the along- and across-track components Imagery scale – 1:10,000 Pixel ground separation distance – 5 to 7 cm Result formats – CAD designs, GIS shape files, GeoTIFF images
14Executive SummaryAerial laser scanning is rapidly becoming the preferred surveying technique. Its high-resolution and rapid results, which are accurate enough for the most construction and mining applications, make aerial laser scanning (or LiDAR) the surveying technology of choice for a changing environment. Combined with geo-referenced high-resolution imagery, the spatial dataset becomes even more intuitive to decision makers and engineers alike.