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Requirements for Triangulation
Measuring Angles in Triangulation
Base Lines for Triangulation Nets
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adjusted aerial photographs algebraic sum axis azimuth backsight base line bench marks bubble camera central meridian Coast and Geodetic coefficient column headed compilation computed condition equation control plot correction datum plane determined difference in elevation direction error of closure feet flight formula Geodetic Survey graph ground ground-survey control points horizontal inches instrument intersection intervals invar latitude length lens located logarithmic longitude map sheet means meters method micrometer millimeters monuments mosaic multiplying negative normal equation observed obtained overlap parallel perpendicular plane coordinates polyconic projection polygon side position principal distance principal point procedure projection projection lines quadrilateral radial lines relief displacement right ascension scale scale-line terminals shown in Fig sight spherical coordinates spherical excess star stereoscopic surface Table tape telescope templet theodolite thread tilt tion transverse Mercator projection triangulation stations U. S. Coast usually value in column values in line vertical