ASO? th HORIZONTAL CONTROL - ENIWETOK ATOLL M.I. 1957 EXPANSION R A network of horizontal control stations was established in 1949-5C to cover the eastern portion of the Atoll. It consisted of a primary net of second order triangulation stations, supplemental with third order stations at locations of lesser importance. Standard procedures of the U.S. Coast and Geodetic Survey were carefully followed in executing the survey. Expansion surveys were completed in 1951, 1952, 1955 and in 1957 to establish additional stations and replace stations destroyed by test operations. The network now encompasses the Atoll and includes sixteen stations to second order specifications and eleven to third order accuracy. scheme. a A third order survey had been completed in 1944 by the USS Bowditch to control hydrographic mapping of the Atoll. This was followed in 1947-48 by a second order scheme of limited area Pacific Southwest Region Reproduced fromtheholdings of th e National Archives:* ~ > Some features of two previous surveys were utilized in the by the U.S. Coast and Geodetic Survey. As the distribution of the existing stations of these surveys did not meet project requirements, and one end station of the base line had been destroyed, a substantially new and stronger scheme was necessary which could be expanded as required. A base line for the net extended from station RUNIT on site YVONNE to a new station NORTH BASE #2 at the north end of the island. Station RUNIT was common to both the USS Bowditch and the USC & GS surveys. NATIONAL ARCHIVES The base line was established to standard REPOSITORY 24ciFic sevTHNEIT KEGION COLLECTION £6326 ATOMIC ENERGY Commission BOX No. £24674 (#1084) A429 EMWETOK 199-7 FOLDER HkiZQwTAg Con TROL 326 -6SAG/ 70 Ham) & NARVER IS W2S (1)