a building underneath a field. In such a case, the only way to decide if an excavation is worth the cost is to carefully analyze the evidence to determine which part to trust. On the one hand, the geophysics might just show an old and forgotten water-pipe, but it might also show the wall of just the building the archaeologists were looking for. The analysis therefore includes careful examination of all the evidence collected. A method often used to determine its value is to compare it to sites of the same period. As the number of well-documented surveys grow, this becomes a slightly easier task, as it is sometimes easier to compare two survey results than to compare a survey result with an excavated site. However, it remains difficult to compare datasets produced by different research teams. See also Systematic survey References External links The Kythera Island Project: Intensive archaeological survey of the Aegean island of Kythera. Archaeological Survey in Sphakia, Crete Archaeological Surveys Group Archaeological Field Work Organization Archaeological Field Workers Job Source : South Cad-bury Environs Project. Archaeological survey of the landscape of a prehistoric Hillfort in south west Britain. Notable for its large-scale application of archaeological geophysics and the geophysical survey in conjunction with expansive test pits. Exploration geophysics Methods in archaeology Field research