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해안사구 변화 모니터링을 위한 시계열 UAV DEM 표고보정
최석근(Choi, Seok-Keun),이승기(Lee, Soung-Ki),최도연(Choi, Do-Yeon),임희창(Lim, Heechang) 한국측량학회 2023 한국측량학회지 Vol.41 No.6
Due to climate change and coastal development, significant transformations in coastal dunes have increased the demand for continuous monitoring. The usage of UAV (Unmanned Aerial Vehicles) for this purpose has escalated. However, early UAV monitoring methods encountered limitations in the continuous installation and field measurement of GCP (Ground Control Points), necessitating the use of a reference DEM (Digital Elevation Model) for elevation correction. Notably, as the study area includes coastal dunes on islands, which differ from the mainland, long-term monitoring involves substantial costs and manpower for GCP surveying. This research introduces an elevation correction method for monitoring changes in coastal dunes, building upon previous studies. UNET was used to distinguish classes in invariant areas and to extract characteristic values from these areas. These values were normalized using the Z-score to eliminate outliers, and a linear regression formula was applied to adjust the DEM values. Over eight years, 13 sets of orthoimages and DEMs were created, both with and without GCPs. The proposed technique was evaluated by comparing DEMs with GCPs to those corrected using the proposed method without GCPs. Additionally, transects were selected to assess the effectiveness of the proposed monitoring method. This study confirms the feasibility of using the corrected DEM without ground control point data for coastal dune monitoring.
최석근(Choi Seok Keun),이승기(Lee Soung Ki),조의환(Jo Ui Hwan),박상전(Park Sang Jeon) 대한공간정보학회 2009 대한공간정보학회지 Vol.17 No.3
현재 제작되고 있는 수치지도 지리조사 기준은 수치지도작성작업내규를 기준으로 각종 작업지침서에 의해 이루어지고 있다. 그러나 수치지도작성작업내규는 과거 종이지도 제작에 사용된 규정을 수정하여 사용하고 있어 현재의 수치지도 품질상에 여러 가지 문제점들이 나타나고 있다. 그러므로, 고품질 수지지도를 제작하기 위해서는 지리조사에 관련된 전반적인 기준들이 재검토되어야 하고, 이를 기준으로 정확한 수치지도를 제작하는 것이 매우 중요하다. 따라서, 본 연구에서는 기존 수치지도 지리조사에 관련된 문제점들을 분석하여 보다 합리적인 지리조사 기준을 정립하므로써 정확한 수치지도를 제작하고자 한다. 이를 위하여 수치지도 작성에 관련된 작업규정들을 분석하고, 기구축된 수치지도 속성자료와 지리조사자료 등을 비교 분석하였으며, 분석된 결과를 지리조사자들과 관련 전문가의 의견을 수렴하여 합리적인 수치지도 지리조사기준을 제시하였다. Field surveys for the digital map being constructed is being conducted using various work guide books based on the digital mapping internal rule. However, a modification of a rule used for paper map construction is being used for the digital mapping rule, which is causing many problems with the quality of the digital map. Therefore, to construct a high-quality digital map, general standards related to conducting field surveys need to be reviewed, and it's extremely important to construct an accurate digital map based on this. Accordingly, in this study, problems related to conducting field surveys for the construction of the digital map are analyzed in order to establish more suitable field survey standards for constructing an accurate digital map. To this end, work regulations related to construction of a digital map were analyzed, and attribute and field survey data were compared to those of a previously-constructed digital map for analysis. By reflecting opinions of field surveyors and related experts to the results of the analysis, more suitable field survey standards for constructing the digital map were presented.