aerial archaeology

Aerial archaeology is the study of archaeological remains by examining them from altitude. The advantages of gaining a good aerial view of the ground had been long appreciated by archaeologists as a high viewpoint permits a better appreciation of fine details and their relationships within the wider site context. Early investigators attempted to gain birdseye views of sites using hot air balloons, scaffolds or cameras attached to kites. Following the invention of the aeroplane and the military importance placed on aerial photography during the First and Second World Wars, archaeologists were able to more effectively use the technique to discover and record archaeological sites. Normally the photographs are taken vertically that is, from directly overhead, or obliquely, meaning that they are taken at an angle. In order to provide a three-dimensional effect, an additional, slightly offset, photo may be taken to provide two images with can be viewed stereoscopically. The advantages of an aerial photographs to archaeologists are manifold. Large sites could for the first time be viewed accurately, in their entirety and within their landscape. This aided the production of drawn plans and also inspired archaeologists to look beyond the discrete monument and to appreciate a site's role within its setting. Photos are taken vertically for the purposes of planning and spatial analysis and obliquely to emphasise certain features or give perspective. Through the process of photogrammetry, vertical photos can be converted into scaled plans. Archaeological features may also be more visible from the air than on the ground. Tiny differences in ground conditions caused by buried features can be emphasised by a number of factors and then viewed from the air:

Slight differences in ground levels will cast shadows when the sun is low and these can be seen best from an aeroplane. These are referred to as shadow marks.
Buried ditches will hold more water and buried walls will hold less water than undisturbed ground, this phenomenon, amongst others, causes crops to grow better or worse, taller or shorter, over each kind of ground and therefore define buried features and cast shadows. Such effects are called cropmarks.
Frost can also appear in winter on ploughed fields where water has naturally accumulated along the lines of buried features. These are known as frostmarks.
Slight differences in soil colour between natural deposits and archaeological ones can also often show in ploughed fields as soilmarks
Differences in levels and buried features will also affect the way surface water behaves across a site and can produce a striking effect after heavy rain.

Pioneers of aerial archaeology include Roger Agache in Northern France, Antoine Poidebard in Syria and O. G. S. Crawford in England.

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