지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
이용수
초록· 키워드
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Shuttle Radar Topography Mission Digital Elevation Model (SRTM DEM) offers opportunities to make advances in many researchareas including hydrology by providing near-global scale elevation measurements at a uniform resolution. Its wide coverage andcomplimentary online access especially benefits researchers requiring topographic information of hard-to-access areas. However, SRTMDEM also contains inherent errors, which are subject to propagation with its manipulation into analysis outputs. Sensitivity of hydrologicanalysis to the errors has not been fully understood yet. This study investigated their impact on estimation of hydrologic derivativessuch as slope, stream network, and watershed boundary using Monte Carlo simulation and spatial moving average techniques. Differentamount of the errors and their spatial auto-correlation structure were considered in the study. Two sub-watersheds of Geum and DeadongRiver areas located in South and North Korea, respectively, were selected as the study areas. The results demonstrated that the spatialpresentations of stream networks and watershed boundaries and their length and area estimations could be greatly affected by the SRTMDEM errors, in particular relatively flat areas. In the Deadong River area, artifacts of the SRTM DEM created sinks even after thefilling process and then closed drainage basin and short stream lines, which are not the case in the reality. These findings providedan evidence that SRTM DEM alone may not enough to accurately figure out the hydrologic feature of a watershed, suggesting needof local knowledge and complementary data.
목차
등록된 정보가 없습니다.
참고문헌 (25)
참고문헌 신청
Aerts, J. C. J. / 2003 / Accounting for spatial uncertainty in optimization with spatial decision support systems / Transactions in GIS 7 (2) : 211 ~ 230
Albani, M. / 2004 / The choice of window size in approximating topographic surfaces from Digital Elevation Models / International Journal of Geographic Information Science 18
Beven, K. J. / 1979 / A physically based, variable contributing area model of basin hydrology / Hydrological Science Bulletin 24 : 43 ~ 69
Bolstad, P. V. / 1994 / An evaluation of DEM accuracy : elevation, slope, and aspect / Photogrammetric Engineering & Remote Sensing 60 (11) : 1327 ~ 1332
Carlisle, B. H. / 2005 / Modelling the spatial distribution of DEM error / Transactions in GIS 9 (4) : 521 ~ 540
Albani, M. / 2004 / The choice of window size in approximating topographic surfaces from Digital Elevation Models / International Journal of Geographic Information Science 18
Beven, K. J. / 1979 / A physically based, variable contributing area model of basin hydrology / Hydrological Science Bulletin 24 : 43 ~ 69
Bolstad, P. V. / 1994 / An evaluation of DEM accuracy : elevation, slope, and aspect / Photogrammetric Engineering & Remote Sensing 60 (11) : 1327 ~ 1332
Carlisle, B. H. / 2005 / Modelling the spatial distribution of DEM error / Transactions in GIS 9 (4) : 521 ~ 540
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