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accuracy ACSM adjustment aerial agencies alignment angle arc segments azimuth base baseline cartographic COGO color contour contour line control surveys County curve Dept determined distance measuring equation equipment error established feet field Figure Forest frequency Geodesy geodetic control geographic coordinates Geological Survey grid heat island Highway horizontal ILLIMAP instrument land survey Land Surveyor laser laser beam line segments ment meters metes and bounds methods monuments National observations obtained Ocean oceanographic offshore operations original output paper photogrammetry photographs plane coordinate system plat plot points of intersection position printed problems procedure records refractive index rhumb line scale screen scribed section corners standard deviation stations surface Surveying and Mapping tape temperature terrain theodolite tion topographic traverse trees triangulation trilateration units urban urban heat island values vertical Washington