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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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PIT ALIGNMENT *
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A single line, or pair of roughly parallel lines, of pits set at intervals along a common axis or series of axes. The pits are not thought to have held posts.
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LINEAR FEATURE *
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A length of straight, curved or angled earthwork or cropmark of uncertain date or function.
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SEWAGE WORKS *
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A group of buildings in which local sewage is filtered and purified in large rectangular or circular tanks.
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ENCLOSURE *
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An area of land enclosed by a boundary ditch, bank, wall, palisade or other similar barrier. Use specific type where known.
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* Copyright of English Heritage (1999)