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GENERAL CHARACTERISTICS OF AIR PHOTOGRAPHS
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accuracy adjusted air coordinates air photographs air station altimeter altitude applied approximately Article auxiliary points axes axis azimuth Barr and Stroud base direction base inclination base length base line camera celluloid coincidence collimating marks Column compilation computed considered contours corre correct cosec depth difference equal Equation error exposure floating marks fused gonio goniometer graphs grid ground control points high obliques horizon trace horizontal intersection lateral level left-hand lens machine means method micrometer millimetre minor control plot minor control points mosaic movements necessary object observations obtained overlap pair parallax parallel perpendicular perspective centre photographs exposed plane plotted position plumb point polar bearings polar distances position circle principal distance principal line principal point base purpose radial readings rectified reduced relative result right-hand rotation scale screen simple stereoscope spot heights square mile Stereoplotter strip sufficient survey theodolite tion topographic triangle usually vertical photographs