Definition: Geophysical Survey
Geophysical survey refers to the collection of information associated with subsurface features, such as burials on land or shipwrecks underwater. Archeologists often use the information they collect to detect and map subsurface features without having to do any destructive or unproductive excavating. The tools used to collect subsurface information are sensors. There are many types of sensors for use by ground, air, and water, and two types commonly used by archeologists are ground penetrating radar and magnetometers.