Aerial photography is a powerful archaeological tool that helps reveal traces of ancient human activity often invisible at ground level. One of the most important features captured in aerial surveys is the appearance of cropmarks—subtle variations in crop growth that occur when buried features such as ditches, walls, roads, or pits affect the moisture and nutrients in the soil above them. These patterns become especially visible during dry summers, when crops over a filled-in ditch may grow taller and greener, while those over a buried stone wall may appear stunted or yellowed.
Cropmarks often betray the outlines of Roman villas, prehistoric enclosures, Iron Age field systems, or even Saxon burial sites. Aerial images taken over decades allow researchers to piece together layers of land use, showing how the countryside evolved—from early farming practices to medieval field arrangements and beyond. For those studying local history or mapping ancestral landscapes, aerial photography helps explain why fields are shaped the way they are, why certain paths persist, and where significant human activity once took place. When used with LiDAR and historic OS maps, aerial imagery completes a multi-dimensional picture of Britain’s richly layered past.