Land Air Water
Chapter 2: Flying high, measuring low
Flying high, measuring low
To create the common dataset for the most efficient deliverable, the various survey methods had to be linked, which required technical solutions and the pilot’s expertise to generate reliable data. To obtain this, the firm devised an exact flight plan using Aibotix’s AiProFlight software. Using an overview map, a waypoint flight plan facilitated precise planning of the autonomously conducted aerial survey.
“The open interfaces of the Aibotix workflow deriving from Aibotix AiProFlight and Agisoft PhotoScan Professional provide us with top quality data with virtually no loss,” said Schwall. “We could then easily combine the aerial and hydrography data seamlessly for one valuable deliverable.”
The aerial survey was conducted after determining highly visible and suitable ground points for the georeferencing of the data. With the ability to immediately review the generated data (pictures taken with a high-resolution compact camera) after each flight, the survey quality was quickly validated. The camera, fixed to the free-floating gimbal of the Aibot X6 multi-sensor platform, enables the pilot and others to review the photographic material as soon as the UAV is on the ground. The images are added automatically during the waypoint flight and tagged with GPS coordinates that are generated by the Aibotix AiGeoBox mounted on the camera.
Calculations showed the project would need five flights each lasting six minutes to cover the 55 hectare area. The flight altitude for this kind of topography was established at 90 metres. Due to the wind conditions of the area on the day of the survey, the pilot decided to carry out a total of seven individual flights. As a responsible UAV owner, IngenieurTeam GEO flies the Aibot X6 in conditions of a maximum wind speed of 6 m/s to ensure safety.
Combined with the results from the hydrography survey, IngenieurTeam GEO was able to provide a complete overview of the site and the current situation that Knobel-Bau used to further its business.
"The combination of survey data from the air, from the ground and from the surveying boat has led to an excellent result. The orthophoto, the exact volume calculation and the 3D model of the gravel pit permit prosepctive planning and accurate assessment of the actual situation," said Bertram Knobel, managing director of Knobel-Bau. “The economic implementation of large-scale projects and the associated results of IngenieurTeam GEO is a decisive advantage in comparison to all conventional and traditional methods.”
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