Riegl Laser Measurement Systems launched the long-range airborne laser scanner LMS-Q780, used in applications of up to 10,000 feet at 100 kHz laser pulse repetition rate.
The laser wavelength qualifies the scanner for glacier and snowfield mapping, and its digital waveform processing capabilities for high-altitude topographic mapping.
Features of the instrument include the automated resolution of range ambiguities, typically occurring at large measurement ranges and high repetition rates.
Peter Rieger, product manager of airborne laser scanning said: “The effect of range ambiguities appearing in airborne laser scanning is known as ‘multiple-time-around’ or ‘multiple-pulses-in-the-air.’ Up to 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 MTA zone – which may be a really difficult task especially in complex terrain like mountainous areas. Riegl’s new generation of airborne laser scanners overcome this limitation by multiple-time-around (MTA) processing.”
For the LMS-Q780 this technique allows a maximum measurement range of 2450 meters at a PRR of 400 kHz and a target reflectivity of 20 percent. Up to 9 laser pulses and their corresponding echoes can be on their way between laser scanner and ground targets simultaneously.