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Andreas Tewes

PhD student

Phone: +49 (0) 228 73 7200 (Monday till Wednesday at INRES)
              +49 (0) 228 73 9052 (Thursday, Friday at ZFL)
Office: 2.001 (INRES), 3.052 (ZFL)
Andreas Tewes

Research profile

Measuring plant parameters in the field is time-consuming and expensive, especially when one is interested in larger scales. Remotely sensed data from unmanned aerial vehicles and/or satellites does the trick: The development of plant parameters over the course of time influences the amount of light that is reflected in different wavelengths. This can be measured frequently by sensors installed on UAVs or satellites over larger areas, at low cost. Discrete measurements in the field can then be extrapolated using multispectral images. But what is the cross-sensor variability given that the UAV acquires images at much higher spatial resolution and different spectral sensitivity? How well can in-field heterogenity be captured over time and space and across sensors?
This is what I will investigate upon during the course of my PhD study, supported by my colleague Dr. Olena Dubovyk and my supervisors PD Dr. Jürgen Schellberg at University of Bonn and Prof Barend Erasmus at University of the Witwatersrand, Johannesburg, South Africa.
For collection of field data, I frequently spend time in the maize fields of rural communities located in Limpopo Province, South Africa.

Current projects