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) 
30 kHz (at  4.7 km height) 
60 kHz (at  2.0 km height) 
100 kHz (at  1.0 km height) 
150 kHz (at  0.5 km height)

Scanning frequency

Up to 90 Hz 
at a 10° scanning angle

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 m 
0.14 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
(average deviation, m)

After post-processing, depending on slant range for scanning angle 45°:

0.11 at Н=500 m 
0.12 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:

Example of points density for set survey parameters:

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