UAV based hyperspectral imaging

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The UHD 185 can be applied to many different applications. The system is compact and designed for the operation on small moving platforms. In May 2013  we evaluated the first UAV based hyperspectral full frame imager in collaboration with Prof. Bareth and his workgroup from the University Cologne.  For this purpose an UHD 185 was fixed under an octocopter (small helicopter).

In this research project the UAV based hyperspectral imaging is evaluated for the use in precision farming.  For this application the UHD 185 is particularly suited because it takes full frame hyperspectral images as well as videos. This means very easy data acquisition and no need for the extensive image correction which is necessary with the push broom scanning technology. With its low weight of 470 g it is perfectly suited for small flying platforms. The UHD 185 can even take images in cloudy conditions unlike a satellite for example. In this way a daily mapping is feasible. In sunny conditions the integration time of one image is lower than 1ms, which enables us to capture images even with higher movement speeds of the UAV.

Octocopter´s setup for hyperspectral imaging

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The octocopter captures agricultural test fields from the air. The UHD 185 records one image per second until the whole area was captured. The octocopter flies in an altitude of 30 – 100 m with a speed of 5 -20 km/h. After flight the hyperspectral image data is evaluated in the wavelength range from 450 – 950 nm. The results are compared with plant parameters, such as biomass, nitrogen content or chlorophyll content.

Contact

We want to thank the workgroup of Prof. Bareth for the good work and the nice collaboration. For more information on the research project, please visit the homepage of the Geographisches Institut, Universität zu Köln.

 

Beispieldaten Bareth 2

Sample data in CIR view. Two testplotts are compared spectraly. In the infrared region big differences can be seen. (Quelle Aasen, H. und Bendig, J.)