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S Introduction 11 Surveying Defined 12 Classes of Surveys 13 Earths
Mistakes 214 Checks 215 Accuracy 216 Summary 217 Role
11 other sections not shown
accuracy adjustment angular axis azimuth backsight benchmark boundary bubble tube calculated centerline computed contour lines corner correction Cosin Sin Cosin Cotan Tan Cotan cross-wire curve datum determined difference in elevation direction dumpy level engineering example eyepiece field fixed follows foot grid ground Hence highway horizontal angles horizontal control horizontal distance instrument intersection intervals land surveys latitude lens line of sight mark measured ment meridian meter method National Geodetic Survey object objective lens observed obtained operations optical transit parallax photograph plane coordinate system plane coordinates plane table plat plumb Polaris position precision procedure radian rear tapeman recorded scale sea level sexagesimal shown in Fig slope distance stadia stake standard station steel tape surface Surveying and Mapping telescope temperature theodolite tion topographic maps tract traverse triangulation tripod U.S. Geological Survey unit usually vernier vertical angle