하천유역구분을 위한 DEM 구축기법에 관한 연구 - 대전시 건천 (乾川) 유역을 사례로 - = A Study on Data selection , Interpolation , and Error Correction in DEM ( Digital Elevation Models ) Construction for Delineation Watersheds ; Case study of Guncheon Watershed

다국어 초록 (Multilingual Abstract)

The purpose of this study is to establish a theoretical basis, upon which we can decide data selection, interpolation, and error correction of raster DEM(Digital Elevation Models) according to topographical characteristics of object areas when we delineate watersheds. For this purpose, 1 analyzed how modifications of raster DEM affect the delineation of watersheds in the areas where diverse topographies are in one watershed. The conclusions of this study are summarized as follows: First, to delineate watersheds accurately in high relief areas, we have to establish TIN(Triangulated Irregular Network) using contour data, construct raster DEMs with Linear or Quintic interpolation method, and correct sink errors. Second, in the case of low relief areas, we use both attitude point data and contour lines data, set up raster DEMs using the Quintic interpolation method, and correct flat triangle errors. Therefore, we must establish DEMs based on topographical characteristics to derive topographic information such as watershed delineation in an area where mountains and flatlands coexist in one watershed. We can obtain accurate watershed delineation by utilizing the raster DEM creation method derived from each topographical characteristic.