Air Reconnaissance in Britain, 1965–68
The results of the air reconnaissance here summarized continue from earlier surveys already described in this Journal. The weather was not particularly favourable for archaeological reconnaissance during any of these four summers, while the period May to October 1968 was, over much of England, one of the wettest of this century. In Scotland, however, the summer of 1968 was comparatively dry with correspondingly favourable development of crop marks.Most of the new information has been gained in the military districts of Wales and the north. Roman military remains tend to be standardized and to form part of a system. Thus both temporary and permanent works may often be identified from a minimum of evidence without the necessity of the whole site being visible, while the geographical distribution, so far as it is known, often suggests where further reconnaissance may profitably be made. Descriptions of military sites and their full significance in the system to which they belong, call for continual reference to local geography, so that the text is best considered in conjunction with appropriate maps such as the 1 inch to a mile series of the Ordnance Survey. Nearly all the features described have been examined on the ground: except when noted otherwise, no remains are ordinarily to be seen on the surface. The records and photographs on which this account is based are housed in the offices of the Committee for Aerial Photography of the University of Cambridge.