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Vertical aerial photograph
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Vertical aerial photographs are taken from immediately overhead using a camera fixed to the underside of an aeroplane. The camera points directly downwards at 90 degrees to the ground. Vertical photographs are particularly useful for identifying sites that survive as cropmarks. See also oblique aerial photographs.
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Cropmark
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Cropmarks appear as light and dark marks in growing and ripening crops. These marks relate to differences in the soil below. For example, parched lines of grass may indicate stone walls. Crops that grow over stone features often ripen more quickly and are shorter than the surrounding crop. This is because there is less moisture in the soil where the wall lies.
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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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SITE *
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Unclassifiable site with minimal information. Specify site type wherever possible.
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RIDGE AND FURROW *
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A series of long, raised ridges separated by ditches used to prepare the ground for arable cultivation. This was a technique, characteristic of the medieval period.
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CRICKET GROUND *
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The entire playing area and associated buildings upon which the game of cricket is played.
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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)
