Geo-Info Ltd

Resistivity imaging is a widely used practice for mapping geological structure within the shallow subsurface. This method measures the electrical current dispersion within the ground, through a set of up to 72 steel rods (electrodes) . Each electrode is put into the ground in a specific array to the project, through careful acquisition planning. Electrical current is injected into the ground via two electrodes and created voltage difference is read by two or more potential electrodes. A set of predefined, automated measurements will provide a two-dimensional distribution of the subsurface resistivity. The results of resistivity imaging can be related to the ground composition including the porosity, water saturation and concentration of dissolved minerals in the ground, which link to specific rock or soil types. Resistivity imaging yields the best results in clayey ground, whereas other techniques (eg. GPR) are less effective.

Utility Detection
Our utility detection and mapping surveys at Geo-Info are neither intrusive nor disruptive and can provide accurate underground utility information. We are able to use a range of techniques including GPR and flexi trace to locate buried services including:
Pipes
Cables
Ducts
Culverts
The results from utility detection can be provided on comprehensive colour-coded drawings with digital location photographs included. The drawings will have the position of all utilities, any links between them and the depth from the surface.

Topographical and site surveys are generally used for planning and designing. They result in the production of maps and/or plans through utilisation of a range of modern techniques including Robotic Total Stations, GPS receivers and Laser Scanners.