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accuracy accurate adjustment air photographs Air Survey Committee air-base angle approximately Arundel Method automatic pilot Barr and Stroud base-line cent co-ordinates contours correct correspondence cosec determined difference of parallax direction distance E. L. M. Burns engineering epipolar plane error exposure feet fixed floating mark flying height focal length Fourcade goniometer graphs grid ground control points ground height height distortions Hotine inches instrument intersection isocentre large-scale lens lenses measured ment minor control multi-lens Northern Rhodesia oblique photographs obtained optical Ordnance Survey overlap pair of photographs parallel perspective centre Photogrammetry photographs taken plate plotter plotting machines plumb point point of detail position possible principal line principal point produced projection radial rays rectified Royal Air Force scale space square miles statoscope stereoscopic observation strip Survey Camera theodolite tilt tion topographical triangulation ultra wide-angle variations vertical photographs wide-angle lens Zeiss