lidar introduction. lidar = light detection and ranging airborne laser scanning – rapid...
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LiDAR Introduction
LiDAR = 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
How does LiDAR work?Simultaneously
• Measure trajectory of aircraft in three dimensions• Measure orientation of laser scanner
about three rotations axes• Transmit and receive laser pulses,
measure the time-of-flight (i.e. range to reflecting surface)
Consequently• Know the coordinates of 150,000 points
surveyed per second• Map the surface of the Earth in high
density
CK Aerial Surveys – InfrastructureAS350 ‘Squirrel’
Leica LiDAR & Camera
CK Aerial Surveys – Specifications
Point density – 15 to 60 points per m2
Vertical accuracy – 7 to 10 cmHorizontal accuracy – 5 to 7 cm in both the
along- and across-track componentsImagery scale – 1:10,000Pixel ground separation distance – 5 to 7 cmResult formats – CAD designs, GIS shape files,
GeoTIFF images
CK Aerial Surveys – Products
Laser point cloud
CK Aerial Surveys – Products
Contours
CK Aerial Surveys – Products
High-resolution aerial photography
CK Aerial Surveys – Products
Power line mapping
CK Aerial Surveys – Products
Flood plain mapping
CK Aerial Surveys – Products
Volumetric calculations for mining applicationsRepeat surface survey – compare surfaces –
accurately calculate volume of removed ore
Survey ComparisonTechnique Traditional CK Aerial Surveys Fixed Wing
Horizontal accuracy 2 cm 5 – 7 cm 10+ cm
Vertical accuracy 3 cm 7 – 10 cm 10+ cm
Point density 1 every 10 – 20 m2 15 – 60 per m2 1 – 5 per m2
Conditions Weather permitting Weather permitting Clear
Imagery scale N/A 1:10,000 1:10,000
Pixel size N/A 5 – 7 cm GSD 5 – 7 cm GSD
Site access Required Not required Not required
Rapid deployment Yes Yes No
[email protected]+27 11 949 8904
Executive 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.