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the engineers transit 6 36 Horizontal angles with the repeating theodolite
Map projections and state plane coordinates 430
Photogrammetric surveying and mapping
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accuracy adjustment alidade angular azimuth bench marks calculated catch point center line circle reading clamp closure compass computed contour contour lines control points correction cross hair cross sections curve decimetre deflection angle described in Art determined difference in elevation dumpy level electronic engineer's transit equipment established example field geodetic graduated head tapeman horizontal and vertical horizontal angles horizontal axis horizontal circle horizontal distance instrument laser least count level bubble level tube leveling screws line of sight magnetic meridian method metres notes observed offset operations photogrammetric photographs plane table plotted plumb position procedure projection recorded relative precision rod reading rotated scale shown in Fig slope distance spirit level stadia interval standard deviation surface surveyor surveys systematic errors tacheometer tacheometry taken target telescope terrain theodolite traverse station triangle tripod usually vertical angle vertical axis vertical circle zenith angle zero