Journal of Korean Society for Geospatial Information Science (대한공간정보학회지)

Korea Spatial Information Society (대한공간정보학회)
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Improving the Slope Calculation Method for Evaluating the Feasibility of the Land Development

토지 개발 적정성 평가를 위한 경사도 계산 방법 개선

  • 이병길 (경기대학교 공과대학 토목공학과)
  • Received : 2016.08.19
  • Accepted : 2016.09.19
  • Published : 2016.09.30
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Abstract

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.

토지 개발 인허가 기준에는 중요 요소로서 경사도가 포함되어 있다. 토지 적성 평가 지침, 산지전용허가기준 등에는 수치지형도상 평가대상 토지의 평균경사도를 측정하여 경사도로 사용하며, GIS를 적용할 수 있다고 규정되어 있다. 입력 자료로는 국토지리정보원의 1/5,000 수치지형도 외에 한국토지정보시스템 전산자료를 활용 가능한 자료로 예시하고 있다. 경사도 계산에는 수치지형도의 등고선을 이용한 방법, 이를 DEM으로 변환하여 이용하는 방법 등 다양한 방법이 제시되고 있으나 표준화된 경사도 계산 방법은 제시되지 못하고 있어 실무에서 혼란이 발생하고 있다. 이러한 혼란을 감소시키기 위하여 본 연구에서는 표준화된 경사도 계산 방법과 적정 해상도를 결정할 수 있는 방안을 제안하고자 하였다. 경사도 계산에 사용되는 여러 방법을 분석한 결과, 지형의 복잡성을 고려하여 결정된 해상도를 가진 DEM을 만들어 유한차분법을 이용하여 평균경사도를 계산하는 개선된 방안을 제시하였다.

Keywords

References

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