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adjustment alidade alignment azimuth backsight bench mark boundaries calculated catch points clockwise compass bearings contour control points corners correction Cosine Sine Cosine Cotang Tang Cotang counterclockwise course deflection angles degrees departures and latitudes differences in elevation direction earth's equal error of closure field figure foot foresight grade Greenwich hour angle grid ground elevations height highway horizontal angle horizontal distance hubs instrument intersection intervals land length level rod line of sight longitude magnetic declination method observation observer's perpendicular offset plane coordinate system plane coordinates plane surveying plane table plate plotted plumb bob Polaris pole polygon position precision radius rectangular coordinates rod reading rotation scale Sine Cosine Sine slope distance stadia Stadia measurements stakes steel tape surveyor Tang Cotang Tang tangent screw telescope transit line transit stations transverse Mercator projection traverse lines triangle tripod true bearing values vernier vertical angle y-coordinates zero