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accuracy adjustment aerial survey altimeter altitude axis azimuth base boat camera celestial sphere circle Coast and Geodetic computed contour control points coordinates Corr correction curve datum determined direction distance Ephemeris equation feet flight lines float flow focal length formula gage Geodetic Survey Geodimeter Greenwich ground control height horizontal hour angle inches instrument intersection interval invar latitude lens located longitude mean velocity measured meridian meters method Metrogon micrometer miles Nautical Almanac observed obtained parallax parallel Photogrammetry picture plane plotted Polaris position principal point projection radial reading recorded refraction right ascension scale sextant shore shown in Fig side sidereal sight signal soundings spherical excess star station stereoscopic stream taken tape tapelengths telescope templet theodolite tilt tion topographic traverse triangulation triangulation stations U. S. Coast U. S. Geological Survey usually vernal equinox vertical weir