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Accurately locating features from air photographs has its difficulties.

Here is an example of a site where archaeologists conducting an evaluation concluded that they could not find a barrow ditch and reported that the local archaeological society was wrong and that it did not exist.

Fortunately we were able to locate both the barrow and the evaluation trench to reveal why the barrow had not been detected by the evaluation.

magnetometry survey of barrow ditch

Magnetometry survey showing barrow ditch and archaeological evaluation trench.

Although the barrow ditch is visible on Google Earth the magnetometry survey enabled its exact location to be determined.