Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography (한국측량학회지)

Korean Society of Surveying, Geodesy, Photogrammetry and Cartography (한국측량학회)
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Studies on Derivation of Appropriate Geodetic System Transformation Schemes for Spatial Data

공간정보의 측지기준체계 변환 기법 도출에 관한 연구

  • Yun, Seonghyeon (Department of Eco-Friendly Offshore Plant FEED Engineering, Graduate School of Changwon National University) ;
  • Lee, Hungkyu (School of Civil, Environmental and Chemical Engineering, Changwon National University) ;
  • Song, Jinhun (Department of Civil Engineering, Graduate School of Changwon National University)
  • Received : 2020.11.13
  • Accepted : 2020.12.14
  • Published : 2020.12.31
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Abstract

Seven techniques widely used in the geodetic transformations have been reviewed and compared to figure out their theoretical characteristics. A series of numerical tests were performed about four data sets. This was followed by result analyses in terms of transformation residuals and accuracies together with some hypothesis testings based on the student-t distribution to confirm the statistical significance of the techniques. In the case of the transformation between the geodetic frames implemented in the same system, no statistical significance was revealed in the results of the 3D transformation techniques, even if the testing area becomes large as the Asia-Oceania continent. Among the 2D transformations, it was possible for the NTv2 grid modeling technique to deliver improved transformation accuracy. Finally, it was possible from the results analyzed in this study to propose the Helmert transformation to geodetic control points and the NTv2 technique to the 2D spatial data transformation of the geodetic systems.

본 연구에서는 공간정보의 측지기준체계 변환에 사용하는 3차원 변환기법 Helmert, Molodensky-Badekas, Standard Molodensky 그리고 2차원 변환기법 Abridged Molodensky, Conformal, Affine, NTv2 (National Transformation version 2)의 적용 가능 좌표 형식, 변환계수 등 이론적 특징을 조사·비교하였다. 이들 기법을 4가지 각기 다른 특징을 갖는 공간정보 좌표 집단에 적용하는 변환 실험을 실시해 잔차 분포, 정확도, Student-T 분포에 대한 가설검정 결과를 분석하였다. 동일 측지기준체계를 달리 구현한 측지기준프레임 사이 변환 시 지각변동을 고려한다면, 그 범위가 아시아-오세아니아로 넓어지더라도 3차원 변환기법들의 적용 결과에 통계적 차이가 나타나지 않았다. 반면, 2차원 변환기법 중에서는 NTv2 기법이 지역적으로 불균질한 공통점의 상대정확도를 반영할 수 있어 가장 높은 변환 정확도를 나타냈다. 본 연구에서의 공간정보의 측지기준체계 변환 이론과 실험적 고찰을 통해 향후 신규 측지기준프레임 도입에 따른 통합기준점 등 측량기준점 변환은 Helmert 기법 그리고 수치지형도·지적공부 등 2차원 공간정보 변환에는 NTv2 변환기법을 적용하는 방안을 제안하고자 하였다.

Keywords

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