DEM에서 추출한 하천종단곡선의 평활화 방법 고찰 및 새로운 방법의 제안 = Comparison Analysis of Methods for Smoothing the Stream Profiles Extracted from Digital Elevation Models and Suggestion of a New Smoothing Method

국문 초록 (Abstract)

DEM의 보급과 처리 기술의 발전으로 DEM으로부터 하천종단을 추출하는 것이 과거 어느 때보다 용이해졌다. 하지만 DEM에서 추출된 하천종단은 인위적인 평지 및 계단과 같은 문제점들도 포함하고 있기 때문에, 자연스런 하천종단을 얻어내기 위해서는 평활화 과정을 거쳐야 한다. 그러나 평활화 자체는 원본 하천종단의 변형을 필연적으로 동반하기 마련이다. 지금까지는 평활화로 인한 원자료의 변형에 대해 객관적이고 정량적인 평가가 없었다. 이에 본 연구는 주요 평활화 방법의 특성을 파악하고, 이들의 한계점을 극복하는 새로운 평활화 방법을 제안하며, 이의 유용성을 검증하였다. 본 연구는 보다 정밀한 평활화 방법을 제시할 뿐만 아니라 연구목적에 부합하는 평활화 방법을 선택하는데도 도움이 될 것이다.

다국어 초록 (Multilingual Abstract)

Easy access to DEMs and the development of technology treating DEMs make it easier to extract stream longitudinal profiles from DEMs than previously done. Since such profiles possess many problems such as artificial flats and steps, it should be required for them to be smoothed like natural profiles to estimate gradient values along those sections. However smoothing itself comes with much distortion of raw profile from original DEMs. There has been no research evaluating quantitatively the effects due to smoothing process. Here we attempt to quantify the effects of major smoothing methods on raw and real profiles, suggest a new method to overcome the limitations of them, and evaluate it. This study not only suggests a new smoothing method, but also provides a guideline for choosing a proper smoothing method.

목차 (Table of Contents)

• 요약
• Abstract
• 1. 서론
• 2. 방법론적 배경
• 3. 연구방법
• 4. 연구결과
• 5. 논의: 평활화 방법 선택을 위한 제언
• 6. 결론
• 참고문헌

참고문헌 (Reference)

1 Wobus, C, "Tectonics from topography: Procedures, promise, and pitfalls" 398 : 55-74, 2006

2 Flint, J. J, "Stream gradient as a function of order, magnitude, and discharge" 10 : 969-973, 1974

3 Lindsay, J. B, "Sensitivity of digital landscapes to artifact depressions in remotelysensed DEMs" 71 : 1029-1036, 2005

4 Gilbert, G, "Report on the Geology of the Henry Mountains" Goverment Printing Office 1877

5 Lindsay, J. B, "Removal of artifact depressions from digital elevation models: towards a minimum impact approach" 19 : 3113-3126, 2005

6 Goldrick, G, "Regional analysis of bedrock stream long profiles: Evaluation of Hack’s SL form, and formulation and assessment of an alternative (the DS form)" 32 : 649-671, 2007

7 Whipple, K, "New tools for quantitative geomorphology:Extraction and interpretation of stream profiles from digital topographic data"

8 Snyder, N. P, "Landscape response to tectonic forcing:digital elevation model analysis of stream profiles in the Mendocino triple junction region, northern California" 112 : 1250-1263, 2000

9 Jenson, S. K, "Extracting topographic structure from digital elevation data for geographic information system analysis" 54 : 1593-1600, 1988

10 Goudie, A.S, "Encyclopedia of Geomorphology" Routledge 2004

11 Kirby, E, "Distribution of active rock uplift along the eastern margin of the Tibetan Plateau: Inferences from bedrock channel longitudinal profiles" 108 : ETG 16-1-ETG 16-4, 2003

12 Mackin, H, "Concept of the graded river" 59 : 463-512, 1948

13 Harbor, D, "Capturing variable knickpoint retrea in the Central Appalachians, USA" 28 : 23-36, 2005

14 Willgoose, G, "A physical explanation for an obser ved area-slope-elevation relationship for catchments with declining relief" 30 : 151-159, 1994

15 Peckham, S, "A new algorithm for creating DEMs with smooth elevation profiles" 34-37, 2009