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Utilization of UAV Photogrammetry for Actual Condition Survey of Government Owned Lands

국·공유지 실태조사를 위한 UAV 사진측량의 활용성 검토

  • LEE, Si-Wook (Yeongcheon Branch Office, Korea Land and Geospatial Informatix Corporation) ;
  • LEE, Jin-Duk (Dept. of Civil Engineering, Kumoh National Institute of Technology)
  • 이시욱 (LX한국국토정보공사 영천지사) ;
  • 이진덕 (금오공과대학교 토목공학과)
  • Received : 2020.11.25
  • Accepted : 2021.03.05
  • Published : 2021.03.31

Abstract

The purpose of this study is to present the applicability to the effective survey into the actual condition of lands such as analysis of occupied location of government owned lands based on orthoimages created from aerial photographs taken by UAV. The boundary point coordinates and areas of the parcels were observed respectively by VRS-GNSS surveying and orthoimages for each land use of two categories of land, i.e. building site and farmland. As a result of comparing boundary point coordinates and areas extracted from UAV orthoimages with VRS-GNSS surveying data which were used as reference data, the RMS error of the coordinates for the boundary points was ±0.074m for both X and Y in the building site, and ±0.150m and ±0.127m for the X and Y respectively in the farmland. The positional error of the boundary point was 1.7~ 2 times higher in the farmland than in the building site where the boundary points were relatively clear. The RMS error of ±8.964㎡ of areas in the farmland was 4.7 times higher than that of ±1.898㎡ of areas in the building site. The area errors of all 22 parcels measured from the orthoimage were found to be within the allowed error range, indicating that it is feasible to apply the orthoimage generated by UAV to survey of government owned lands in terms of accuracy.

본 연구에서는 UAV에 의해 촬영한 항공사진으로부터 정사영상을 생성하고 이를 바탕으로 국·공유지의 점유위치 분석 등 효율적인 토지실태조사에의 적용성을 제시하는데 연구의 목적을 두었다. 대지와 농경지 두 가지 유형의 토지이용별로 필지 경계의 좌표 및 면적을 VRS-GNSS측량과 정사영상에 의해 각각 관측하였다. VRS-GNSS 측량성과를 기준데이터로 하여 UAV 정사영상에서 추출된 경계점 좌표 및 면적을 비교분석한 결과, 경계점들에 대한 좌표의 RMS오차는 대지에서 X, Y 모두 ±0.074m, 농경지에서 X, Y 각각 ±0.150m, ±0.127m를 보였다. 경계가 비교적 뚜렷하게 나타나는 대지에 비해 농경지에서 경계점의 위치오차가 1.7~2배 정도 크게 나타났다. 토지면적의 RMS오차는 대지에서 ±1.898㎡, 농경지에서 ±8.964㎡로서 대지에 비해 농경지에서 면적오차가 4.7배 정도 높게 나타났다. 정사영상으로부터 측정한 22개 필지의 면적오차가 모두 허용오차 범위 내에 있는 것으로 나타남으로써 정확도 측면에서 UAV 사진측량에 의한 정사영상을 국·공유지 토지이용 실태조사에 적용하는데 타당성이 있음을 보여준다.

Keywords

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