Geophysical survey
From Wikinfo
Geophysical survey is a form of archaeological survey. It makes use of non-invasive techniques such as a ground-penetrating radar, magnetometry, or measurements of electrical conductivity to detect buried features invisible from the surface.
References
- Adapted from the Wikipedia article, "Geophysical_survey" http://en.wikipedia.org/wiki/Geophysical_survey, used under the GNU Free Documentation License
