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75 Figure 3: Triangular greenness index (TGI) as related to leaf greenness and photochemical reflectance index (PRI) as related to leaf nitrogen content (mg g –1 ). Green = soy bean, red = maize, yellow = sunflower and black = buckwheat. References [1] J. B. Campbell, H.W. Randolph, Introduction to remote sensing, CRC Press, 2011. [2] I. Colomina, P. Molina, Unmanned aerial systems for photogrammetry and remote sensing: A review, ISPRS Journal of Photogrammetry and Remote Sensing, Volume 92, June 2014, Pages 79– 97. [3] ETH research station Lindau-Eschikon, https://www.ethz.ch/en/campus/locations/zurich- region/lindau-eschikon.html [4] Gamaya, Accessed 12.12.2014, http://www.gamaya.co/ [5] Pixhawk, Accessed 12.12.2014, https://pixhawk.ethz.ch/ [6] Liebisch F., Küng G., Damm A., Walter A. (2014) Characterization of crop vitality and resource use efficiency by means of combining imaging spectroscopy based plant traits, Workshop on Hy- perspectral Image and Signal Processing: Evolution in Remote Sensing, IEEE International, 24–27 June, Lausanne, Switzerland.