Classification, standards of accuracy, and general specifications of geodetic control surveys
National Ocean Survey. Federal Geodetic Control Committee, United States. Federal Geodetic Control Committee
U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, 1974 - Science - 12 pages
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1".0 per station 2".0 per station arcs area surveys seldom Automatic or tilting basic framework bench mark Class I Class Class I leveling Class I Principal classifications and standards curacy distance in kilometers earth's crust Federal Geodetic Control FGCC Detailed Specifications First-Order leveling form closed circuits forward and backward Geodetic Control Committee Geodetic Control Surveys geopotential gravity High Precision Traverses invar scale rods km As needed km Class km double-run km in length measurement Standard error metropolitan area control Metropolitan area surveys micrometers national datum National Network national vertical needed As needed nights Standard error number of observations Principal stations sel Principal stations seldom Recommended spacing Rejection limit satellite triangulation second of arc Second-Order Class Secondary Network seldom to exceed spacing of principal spread between observations Standards of Accuracy stations seldom less surveying and mapping Third-Order Class tilting levels tional Network topographic mapping Trilateration tween Vertical angle observations Vertical Network