Journal of Conservation Science (보존과학회지)

The Korean Society Of Conservation Science For Cultural Heritage (한국문화재보존과학회)
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Analysis of Changes in Vegetation Index Through Long-term Monitoring of Petroglyphs of Cheonjeon-ri, Ulju

울주 천전리 각석의 장기 모니터링을 통한 식생지수 변화 분석

  • Ahn, Yu Bin (Conservation Science Division, National Research Institute of Cultural Heritage) ;
  • Yoo, Ji Hyun (Conservation Science Division, National Research Institute of Cultural Heritage) ;
  • Chun, Yu Gun (International Cooperation Team, Korea Cultural Heritage Foundation) ;
  • Lee, Myeong Seong (Conservation Science Division, National Research Institute of Cultural Heritage)
  • 안유빈 (국립문화재연구소 보존과학연구실) ;
  • 유지현 (국립문화재연구소 보존과학연구실) ;
  • 전유근 (한국문화재재단 국제교류팀) ;
  • 이명성 (국립문화재연구소 보존과학연구실)
  • Received : 2021.09.27
  • Accepted : 2021.11.02
  • Published : 2021.12.20
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Abstract

In this study, vegetation index, the vegetation index calculated based on hyperspectral images was used to monitor Petroglyphs of Cheonjeon-ri, Ulju from 2014 to 2020. To select suitable the vegetation index for monitoring, indoor analysis was performed, and considering the sensitivity to biocontamination, Normalized Difference Vegetation Index (NDVI) and Triangular Vegetation Index (TVI) were selected. As a result of monitoring using the selected vegetation index, NDVI increased from 2014 to 2018 and then decreased in 2020, after preservation treatment. On the other hand, TVI was difficult to confirm the tendency during the monitoring. This difference was due to the variation in spectral reflectance according to the photographing conditions by year. Therefore NDVI is less sensitive to spectral reflectance deviation than TVI, so it can be used for monitoring. In order for TVI to be used, however, in-depth study is needed.

이 연구에서는 초분광 영상을 기반으로 산출된 식생지수를 활용하여 2014년부터 2020년까지 울주 천전리 각석에 대한 모니터링을 수행하였다. 모니터링에 적합한 식생지수 선정을 위해 실내분석을 수행하였고, 생물오염에 대한 민감도를 고려하여 NDVI와 TVI를 선정하였다. 선정된 식생지수를 활용하여 모니터링을 수행한 결과, NDVI는 2014년부터 2018년까지 증가하는 경향을 보이고 보존처리 이후인 2020년 감소하였으나, TVI는 모니터링 시점에 따른 경향성을 확인하기 어려웠다. 이러한 경향은 연도별 촬영조건에 따른 분광반사율 편차에서 기인하는 것을 확인하였다. 이때 NDVI는 TVI보다 분광반사율 편차에 대한 민감도가 낮아 모니터링에 활용할 수 있을 것으로 판단되며, TVI의 활용을 위해서는 심화연구가 필요하다.

Keywords

Acknowledgement

이 연구는 문화재청 국립문화재연구소 "문화유산 융복합연구(R&D)"의 지원을 받아 수행된 연구임을 명기하며, 기관의 지원에 감사드립니다.

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