In a somewhat oblique photograph
of the reverse face of the cathedral's clock, graffiti--names, initials, dates, the inevitable heart--are inscribed into its apparently etched glass surface.
For a more pictorial view, you can order an oblique photograph
shot at an angle, rather than a straight overhead.
Despite this, our survey with an archaeological observer produced some 250 aerial oblique photographs
from three flights in early May 2003.
Low altitude (167 m), conventional aerial color digital oblique photographs
were acquired from a Cessna TU206 aircraft, using a Kodak Digital Sciences (model DC120) camera, equipped with a 4 mb picture card and a 38-114 mm auto focus zoom lens.
In this 72-year period Avebury and its environs have been surveyed from the air frequently (there are 416 oblique photographs
of the site in the NMRC alone), but until August 1995 no aerial photograph showed cropmarks or parchmarks within the henge from which an accurate map could be made (although some parchmarks were photographed in 1989 by the National Trust Warden).
A listing of photographs held by RCHME identifies over 60 specialist oblique photographs
within the kilometre square (TF0908) where the features lie.
With the exception of a couple of flights organized by archaeologists and art historians between the two world wars, which resulted in a small collection of oblique photographs
documenting sites (Bohm 1939-40), and a few scarce attempts to do the same during the post-war communist period (1948-89; Sedlacek & Vencl 1975), no conceptual programme in respect to aerial archaeology appeared in Bohemia until after the 1989 revolution.