The instrument Geophilus Electricus (Lück & Rühlmann, 2013) measures continuously (i.e. with the blue wheel electrodes while driving) an equatorial dipole-dipole array with five different spacings from 0.6 to 3.0m. The shown sensitivity distribution (Guillemoteau et al., 2017) demonstrates how the  subsurface resistivities contribute to the measured values. The task of the LIAG is the reconstruction of electrical conductivity from the measured data. Aim is to develop a robust (for routine field application) software that will eventually generate soil texture maps while using other sensors as gamma activities. These maps are then the basis for the field management. The project TONIA joins farmers, agronomists, soil scientists, geophysicists and software developers to address socially relevant problems in practical application.

• Lück, E.; Rühlmann, J. (2013): Resistivity mapping with GEOPHILUS ELECTRICUS – Information about lateral and vertical soil heterogeneity. Geoderma 199, 2-11. http://dx.doi.org/10.1016/j.geoderma.2012.11.009
• Guillemoteau, J., Lück, E. & Tronicke, J. (2017): 1D inversion of direct current data acquired with a rolling electrode system. Journal of Applied Geophysics 146, 167-176. https://doi.org/10.1016/j.jappgeo.2017.09.010