ERT electrical resistivity tomography is non-intrusive surface method used to map subsurface resistivity and define geological features. 

ERT data are collected with automated multi-electrode resistivity meters. The chief advantage of ERT method is great accuracy of measurements as well as high immunity to electrical interferences. Depending on applied electrode array ERT survey allows to choose 1D, 2D or 3D imaging. Interpretation of ERT data provides information on the mineral deposit and its depth, presence of aquifers or on the source and extent of groundwater and soil pollution.

Geoelectrical resistivity methods are one of the most popular survey techniques of applied geophysics. Interpretation of data allows for separation of zones with different resistivity values; subsurface resistivity distribution reflects soil thickness and geologic variability as well as  natural and anthropogenic features in the shallow subsurface.