Boundary Line Extraction of Forest Land for Cadastral Resurvey Using UAV and GIS

Objectives: The purpose of this study is to propose a way to extract the boundary lines of forest land using a UAV and GIS for small forest area including the cadastral resurvey project zone, and then show its feasibility for the project by analysis of its accuracy. Methods/Statistical analysis: High-resolution orthophotos of the selected test area were obtained through UAV photography. These images were used to extract the boundary line of the forest land, and the result was compared with the boundary setting results of existing cadastral resurveys for analysis. Findings: For the accuracy of the UAV orthophotos produced, the RMSE of connection errors of X and Y coordinates was calculated as ± 0.0668 m, which appeared applicable to the boundary setting of the forest area. The produced images and GIS data were used to extract the boundary lines of the forest area, which was compared with the boundary determination results of existing cadastral resurveys, and most of them were highly coincident. Improvements/Applications: In some areas, the boundary lines were not coincident, due to characteristics of the boundary setting of existing cadastral resurveys. It was expected that it was possible to make these coincident if additional adjustments were applied.