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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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RECTILINEAR ENCLOSURE *
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A monument consisting of an area of land enclosed by a ditch, bank, wall, palisade or similar barrier, where the barrier consists of several straight or near straight sections.
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DITCHED ENCLOSURE *
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An area of land enclosed by one or several boundary ditches. Double index with a term to indicate the shape of the enclosure where known.
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FIELD BOUNDARY *
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The limit line of a field.
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* Copyright of English Heritage (1999)