Abstract
Unmanned Aerial Vehicles (UAV) have been recognized as a tool for geospatial data acquisition due to their flexibility and favourable cost benefit ratio. The practical use of laser scanning devices on-board UAVs is also developing with new experimental and commercial systems. This paper describes a light-weight laser scanning system composed of an IbeoLux scanner, an Inertial Navigation System Span-IGM-S1, from Novatel, a Raspberry PI portable computer, which records data from both systems and an octopter UAV. The performance of this light-weight system was assessed both for accuracy and with respect to point density, using Ground Control Points (GCP) as reference. Two flights were performed with the UAV octopter carrying the equipment. In the first trial, the flight height was 100 m with six strips over a parking area. The second trial was carried out over an urban park with some buildings and artificial targets serving as reference Ground Control Points. In this experiment a flight height of 70 m was chosen to improve target response. Accuracy was assessed based on control points the coordinates of which were measured in the field. Results showed that vertical accuracy with this prototype is around 30 cm, which is acceptable for forest applications but this accuracy can be improved using further refinements in direct georeferencing and in the system calibration.
Highlights
Unmanned Aerial Vehicles (UAV) have become widely accepted as a tool for aerial image acquisition due to their flexibility and favourable cost benefit ratio
Two flights were performed with an UAV octopter carrying the equipment
This paper presents a light-weight laser scanning system
Summary
Unmanned Aerial Vehicles (UAV) have become widely accepted as a tool for aerial image acquisition due to their flexibility and favourable cost benefit ratio. Most UAVs are being developed to carry an RGB camera with the purpose of acquiring images but lack accurate georeferencing. For some applications these UAVs with low cost RGB cameras are suitable but there are other problems demanding more sophisticated sensors. A mobile laser scanning system has certain components: a Global Navigation Satellite System (GNSS) receiver and inertial measurement unit (IMU), providing platform position and attitude; a laser ranging unit, which sends and receives laser pulses and computes distances; the scanning mechanism which. The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume XLI-B1, 2016 XXIII ISPRS Congress, 12–19 July 2016, Prague, Czech Republic redirects laser pulses to known angles; electronic/computer components for control and data recording (Shan and Toth, 2008).
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