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accuracy adjustment angle measurements approximately Asterisks indicate problems axis azimuth backsight bench mark bubble calculated Chapter clamp clockwise compass computed contour correction cross hairs deflection angles departures and latitudes determined differential leveling digital theodolites direction distance measurements dumpy level EDM instrument electronic elevation difference ellipsoid equipment errors example field notes foresight geoid graduated Gunter's chain horizontal angles horizontal distance level vial line of sight locations magnetic bearing magnetic declination measured angles meridian method minus sights misclosure mistakes National Geodetic Survey normal distribution observations obtained operator plane coordinate systems plane coordinates plate plumb bob position precise pseudoranging recorded rod readings satellite scale Section setup shown in Figure Similar to Problem slope distance stadia standard deviation surveyors tangent screw tape length tapeperson telescope temperature theodolite topographic total station instruments transit tripod types vernier vertical angles zenith angle