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Aerial Photograph
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Aerial photographs are taken during an aerial survey, which involves looking at the ground from above. It is usually easier to see cropmarks and earthworks when they are viewed from above. Aerial photographs help archaeologists to record what they see and to identify new sites. There are two kinds of aerial photographs; oblique and vertical.
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DITCH *
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A long and narrow hollow or trench dug in the ground, often used to carry water though it may be dry for much of the year.
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* Copyright of English Heritage (1999)