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Aerial laser scanners
For performance of aerial laser scanning the “Meridian+” Enterprise possesses a modern aerial laser scanning system ALS 50-II (Leica Geosystems, Switzerland), which provides high-density point cloud with high spatial coordinates accuracy (10 – 13 cm). Capability of lidar survey at low (200 m) and high (6000 m) altitudes provides for a wide range of the equipment’s application.
Main technical characteristics of the ALS-50-II aerial laser scanner
Pulse rate |
20 kHz (at 6.0 km height) |
Scanning frequency |
Up to 90 Hz |
Scanning angle |
10° - 75° |
Minimum and maximum slant range, minimum height for scanning angle 45 °, m |
200 – 6000, 5500 |
Planned coordinates determination accuracy (average deviation, m) |
After post-processing, depending on slant range for scanning angle 45°: 0.12 at Н=500 m0.14 at Н=1000 m 0.18 at Н=1500 m 0.22 at Н=2000 m 0.30 at Н=3000 m 0.60 at Н=6000 m |
Points height determination accuracy |
After post-processing, depending on slant range for scanning angle 45°: 0.11 at Н=500 m0.12 at Н=1000 m 0.13 at Н=1500 m 0.14 at Н=2000 m 0.17 at Н=3000 m 0.25 at Н=6000 m |
Registered reflections number |
4 (first, second, third and the last) |
Advantages of the ALS-50-II aerial laser scanner:
- Wide range of possible scanning angles;
- High-altitude survey capability;
- High planned accuracy of determination of laser reflection points’ allocation;
- High accuracy of determination of laser reflection points allocation at high survey altitudes;
- MPiA regime (Multiple Pulses in Air), which provides high-density of laser reflection points even at relatively high survey altitudes.
Example of points density for set survey parameters:
- Scanning angles - 25°
- Flight altitude - 1560 m
- Aircraft speed – 300 km per hour
- Average points density – 2.5 points per m2