Airborne Laser Scanner

Riegl Laser Measurement Systems GmbH

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Riegl Laser Measurement Systems GmbH has launched the LMS-Q780 long-range airborne laser scanner with an operating flight altitude of up to 10,000 ft at a 100-kHz laser pulse repetition rate.

The laser wavelength qualifies the scanner for glacier and snowfield mapping, and its digital waveform processing capabilities qualify it for high-altitude topographic mapping.

Features include automated resolution of range ambiguities, typically occurring at large measurement ranges and high repetition rates. The effect of range ambiguities appearing in airborne laser scanning is known as “multiple time around” or “multiple pulses in the air.” Until now it was necessary to carefully consider the appearance of range ambiguities during flight planning by choosing a flight altitude above ground, assuring that all range measurements stay within a single multiple-time-around zone, which can be difficult, especially in complex terrain like mountainous areas.

The new airborne laser scanner overcomes this limitation by multiple-time-around processing.

The technique allows a maximum measurement range of 2450 m at a pulse repetition rate of 400 kHz and target reflectivity of 20%. Up to nine laser pulses and their corresponding echoes can be on their way between laser scanner and ground targets simultaneously, improving data acquisition efficiency.

Proprietary RiMTA software resolves range ambiguities automatically without any user interaction.

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Published: October 2012