Abstract
Electrical resistivity tomography (ERT) is, nowadays, the most used geoelectrical method. A development of measurement devices and computer data processing make geophysical measurements available not only to a geophysical groups, but to a wide range of geoscience disciplines, including civil engineering and archaeology.
However, it brought not only an expansion in using of geophysical methods but also problems with final interpretation of ERT results. Non-specialist geophysicists are not aware of complexity of parameters hidden behind the final picture given by interpretative program for ERT.
They take the final output of the computer processing as the only possible solution and they completely neglect boundary conditions of the solution and, in fact, of whole processing. Within this paper, we would like to point out on some aspect of this problem.