The photography is at a variety of scales and has provided complete coverage of the country since the 1950's. These are all vertical aerial phtographs taken from aircraft. Photography is continuously reflown to provide new photography for ongoing map revision and for sale to users. Unlike a generalised line map, almost all detail is visible on an aerial photograph. The user, although unable to make accurate measurements on the photograph, is able to perform his or her own interpretation of what exists on the ground.
Aerial photographs are also an historic record of what existed at the time the photograph was taken.
Modern aerial photographs are a standard contact size of 23 x 23cm. Enlargements of up to three times a photograph area are available. Overlapping stereopairs may be purchased for stereo viewing, providing the user with a 3-dimensional image. Colour photography is also available in selected areas.