토지 개발 적정성 평가를 위한 경사도 계산 방법 개선

토지 개발 적정성 평가에 쓰이는 경사도 계산 방법을 개선했다.

Slope is one of the most important factor in land development permission standards. In guideline of 『Land Suitability Assessment』 or 『Forest Land Conversion Standard』, average slope can be measured using digital map and GIS for target area. Inputs in slope calculation are 1/5,000 digital map of NGII(National Geographic Information Institute) or digital information of Korea Land Information System. Many confusions occur in the field, as there is no standard for slope calculation and are lots of slope calculation methods using contour lines or DEM derived from them.

Avoiding these confusions, this study was intended to propose a standardized method for slope calculation and a selection method for a suitable resolution. In this study, using DEM of optimum grid size according to the complexity of topography with finite difference method is suggested as improved slope calculation method, after comparing several representative slope calculation methods.