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accuracy acres adjustment adverse possession altitude approximately axis azimuth backsight base line boundary bubble center line central angle chains chord circular curve closed traverse Compute contour coordinates correct cross-hair deflection angles Determine difference dumpy level East elevation error feet given grade ground Gunter's chain highway horizontal distance inches instrument intersection land surveyor latitude latitudes and departures length lens line of sight longitude magnetic bearing magnetic declination measured meridian metes and bounds method miles monuments objective lens observation offset Outline parallax parallel parcel perpendicular photographs plane table plat plotting Polaris polyconic projection projection radius recorded scale screws section corner shown side sketch slope stake spiral stadia station steel tape subdivision superelevation surface tangent telescope tellurometer thence theodolite township tract transit triangulation true vernier vertical angle vertical curve West