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


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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Correspondence to Jae-Hwa Choi.

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Choi, JH. Evaluation of the accuracy of the new Primary Precise Geodetic Network in Korea. Earth Planet Sp 50, 629–634 (1998).

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  • Korean Peninsula
  • Secondary Network
  • Geographical Survey Institute
  • Free Network
  • National Geography Institute