1. LiDAR Introduction

2. 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
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3. How does LiDAR work? Simultaneously Consequently
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

4. CK Aerial Surveys – Infrastructure
AS350 ‘Squirrel’ Leica LiDAR & Camera
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5. CK 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

6. CK Aerial Surveys – Products
Laser point cloud

7. CK Aerial Surveys – Products
Contours

8. CK Aerial Surveys – Products
High-resolution aerial photography

9. CK Aerial Surveys – Products
Power line mapping

10. CK Aerial Surveys – Products
Flood plain mapping

11. CK Aerial Surveys – Products
Volumetric calculations for mining applications
Repeat surface survey – compare surfaces – accurately calculate volume of removed ore

12. Survey Comparison Technique Traditional CK Aerial Surveys Fixed Wing
Horizontal accuracy
2 cm
5 – 7 cm
10+ cm
Vertical accuracy
3 cm
7 – 10 cm
Point density
1 every 10 – 20 m2
15 – 60 per m2
1 – 5 per m2
Conditions
Weather permitting
Clear
Imagery scale
N/A
1:10,000
Pixel size
5 – 7 cm GSD
Site access
Required
Not required
Rapid deployment
Yes No

13. www.ckas.co.za info@ckas.co.za +27 11 949 8904

14. Executive Summary
Aerial 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.