Evaluation of the accuracy of the new Primary Precise Geodetic Network in Korea

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  • Choi Jae-Hwa
    Department of Civil Engineering, Sungkyunkwan University

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  • Evaluation of the accuracy of the new P

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Accuracy of the Primary Precise Geodetic Network (PPGN) established during the period of 1975-1994 in Korea is investigated through an analysis of residual from free network adjustment. The PPGN, composed of 1155 points with mean side-length of 11 km, was surveyed by EDM trilateration to revise old triangulation network established in 1910 s. A-posteriori standard deviation of unit weight is 3.8 × 10-6 of the observed length. Most of the estimated error ellipses of horizontal coordinates are nearly circular with a radius <5 cm except those in the marginal part of the network. Mean error of the adjusted coordinates was ±4.5 cm, a value good enough for a geodetic control network of current standard, and as the reference for future crustal deformation studies.

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