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Validity Assessment of Viewpoints Using the Reverse-viewshed Frequency Analysis

역방향 가시빈도 분석에 의한 조망점의 유효성 평가

  • Park, Jong Chan (Institute for Geomatics Research Engineer, Saehan Aero Survey co., Ltd.) ;
  • Um, Dae Yong (Department of Civil Engineering, Korea National University of Transportation)
  • Received : 2013.05.30
  • Accepted : 2013.10.23
  • Published : 2013.10.31

Abstract

Recently, the landscape change by development has become more important and it's been stipulated that environmental effects evaluation must include LIA which reflects the said issue. Even though the selection of viewpoints which have the biggest impact on LIA result is stipulated in accordance with related rules, the criteria are inconsistent. Therefore, LIA experts' or project developers' subjective opinions have been very influential. In this case, wrong viewpoints which do not meet the selection criteria could be selected based on a discretionary interpretation on them, which could in turn substantially reduce an accuracy and reliability of the LIA results. Therefore, this research suggested the reverse-viewshed frequency technique as method that can be verified accuracy and reliability of viewpoints. And it has comparatively analyzed effective viewpoints using reverse-viewshed frequency analysis on viewpoints which were selected for LIA. As a result, the average validity was just 58% of total viewpoints used in construction sites. And the validity of viewpoints decreased as viewshed frequency increased. Based on results above, it was able to verify that the unreasonable points of a substantial proportion have been used as viewpoints in LIA process.

최근 개발사업의 시행에 따른 경관의 변화에 많은 관심이 모아지고 있으며, 이를 반영하여 환경영향 평가과정에서 경관영향평가를 필하도록 규정하고 있다. 그러나 경관영향평가의 결과에 가장 큰 영향을 미치게 되는 조망점의 선정은 관련지침에 의해 규정되어 있으나 그 기준의 일관성이 결여되어 있어 경관영향평가를 시행하는 전문가 또는 사업시행자의 주관적 판단에 상당수 의존하고 있는 실정이다. 이로 인해 실제 조망점 선정기준의 해석여부에 따라 기준에 부합하지 못하는 조망점이 선정되는 사례가 발생하여 경관영향평가 결과의 정확도 및 신뢰도를 크게 저해할 수 있게 된다. 이에 본 연구에서는 경관분석에 적용한 조망점의 신뢰도를 보다 객관적이며 직관적으로 검증할 수 있는 방안으로 기존의 가시빈도 분석을 변형한 역방향 가시빈도 분석기법을 제안하고, 실제 개발사업의 환경영향평가 과정에서 경관영향평가를 위해 선정된 조망점들에 대하여 역방향 가시빈도 분석기법을 적용하여 유효성을 평가하였다. 연구결과, 연구대상지에서 경관평가를 위해 이용된 조망점들의 유효율은 전체 평균 58%에 불과하였으며, 가시빈도수를 높일수록 조망점의 유효율은 크게 저하됨을 확인할 수 있었다. 이로서 경관영향평가 과정에서 선정된 예비 조망점들 중 상당수는 불합리한 점이었음을 검증할 수 있었으며, 이에 따라 경관분석의 정확도와 신뢰도 역시 저하되었을 것으로 판단된다.

Keywords

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