Case Study
Aerial Mapping with md4-1000

Data-processing with Orbit Strabo software

After loading the images and external orientation  file  from the Microdrone, the project – based on a fully automatic plotting point and matching procedure – was completed in full after just a few hours of computer calculation time.

The results speak for themselves: the error in x and y on object points (and ground reference points) is virtually identical to the pixel resolution (1.5cm) (z = 2x). This is certainly a level of resolution considered to be sufficient for surveying and if required can be refined further by setting a lower flight altitude or by using a different type of camera or lens.

3D visualisation and stereo mapping with Orbit Strabo
However, it is not just the  speed and accuracy of the fully automatic adjustment that springs to mind, but the 3D visualisation and totally automatic DTM (Digital Terrain Model) creation make  other applications achievable in practice. By adding breaklines via stereo mapping to the DTM, proper 3D visualisation and accurate true orthophotos become available, which produce some fine shots.

The accuracy of the stereo recording, – based on a fixed flight plan and made using a professional UAV – means that mapping in stereo images becomes possible. As a result and using anaglyphs, stereographics or Orbit’s optimized Strabox mode, 3D coordinates can be measured accurately. This enables property boundaries on the ground or any other point, line or surface element to be entered; integrating the Orbit Strabo software into the Orbit GIS package also means adding other attributes into the mix.

The next step is to use the photographs taken and the height model produced to make a fully automatic, high- resolution ‘true’ orthophoto. This type of orthophoto is different in that all of the ‘lying down’ buildings are now standing nice and upright.

In addition to supplying the proven, state-of-the-art software and technology to make all this possible, Orbit GT also take the burden off their customers by carrying out complete turnkey projects.

Although the UAV technology presented here is not likely to replace surveyors and their theodolites any time soon, it does demonstrate that the technology can be used increasingly in specific circumstances. The photographic material produced ensures that this technology stands out clearly from traditional  surveying. And it does mean that UAV surveying technology – backed by the results from this pilot project in conjunction with the Dutch Land Registry – can finally be taken seriously.

Corporate Profile
The microdrones are rotary winged VTOL Mini UAS with a maximum take-off mass of less than 25 kg and based on the Quadrocopter principle.

Currently, the privately held microdrones GmbH provides two product lines: The compact microdrone md4-200, which stays in the air up to 30 minutes, carries 200 grams, flies in wind speeds of up to 8 m/s, measures 540 mm from rotor shaft to rotor shaft, and has a maximum take-off weight of 1100 grams. The larger microdrone md4-1000, stays in the air up to 88 minutes, carries 1200 grams, flies in wind speeds of up to 16 m/s, measures 1033 mm from rotor shaft to rotor shaft, and has a maximum take-off mass of 5550 grams. Both microdrone models are equipped with flat core, low rpm and high torque motors for a highly efficient drive system, CFD optimized propellers, and a closed CFRP body for all weather deployment.

Equipped with high-resolution photo, video, thermography, or other sensor systems, microdrones simplify the job of aerial reconnaissance significantly for both, civilian and military operations. Fully automatic GPS waypoint navigation has facilitated aerial mapping, aerial surveillance, aerial inspection services, aerial scientific services or aerial search & rescue jobs worldwide since 2005.

The operating pilots enjoy the benefits of a wide range of security features such as position-hold, auto-homing, virtual cage, safety landing and the powerful flight data recorder. Other features such as an open interface, resistance to rain, snow or dust and an officially passed fire-test of the carbon fibre body and the drives, make microdrones one of the best solutions you can buy.

In the future microdrones will continue to design, engineer and produce RPA solutions made in Germany. Follow microdrones on www.micrdrones.com and learn more about the 3rd Generation of Autopilot and how users can easily program and control their own payload - simply by writing an App.
microdrones GmbH
Gutenbergstrasse 86
57078 Siegen – Germany
+49 (0) 271 77 00 38 – 0

Orbit GeoSpatial Technologies
Industriepark E17, 2021
Scherpeputstraat 14
9160 Lokeren - Belgium
T +32 9 340 5757
F +32 9 340 5450

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