Electrical Resistivity Tomography (ERT) is a non-invasive geophysical method used to map subsurface structures by injecting electrical current and measuring ground resistance. The evolution from 2D to 3D and 4D imaging allows scientists to view underground layers in flat slices, full volume blocks and over changing time periods.

Dataset/2D
Dataset/3D
Image in .JPEG
data in ASCII format

Nondestructive (no permanent damage or alteration)
Noninvasive (no physical alteration)

IRIS Instruments

Syscal Pro Switch

hundreds of square metres, depends on time and resolution