Journal of the Korean Association of Geographic Information Studies (한국지리정보학회지)

The Korean Association of Geographic Information Studies (한국지리정보학회)
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Assessment on the Applicability of a Handheld LiDAR for Measuring the Geometric Structures of Forest Trees

산림지역 수목의 기하학적 구조 측정을 위한 휴대용 라이다 장비의 활용성 평가

  • 최승운 (국립공원공단 국립공원연구원) ;
  • 김태근 (국립공원공단 국립공원연구원) ;
  • 김종필 (국립공원공단 국립공원연구원) ;
  • 김성재 ((주)신우아이씨티)
  • Received : 2022.02.23
  • Accepted : 2022.04.06
  • Published : 2022.06.30
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Abstract

This study tried to assess the applicability of a hand-held LiDAR for measuring the geometric structures of forest trees including diameters at a breast height(DBH) and tree height(H). A traditional method using tapelines was conducted to analyze the accuracy of the LiDAR instrument in the Taebaeksan national park in South Korea. Four statistical indices which are bias, root mean square error, mean absolute error, and correlation coefficient were employed to compare the measurements by the LiDAR instrument and traditional method. The DBHs from the LiDAR were very similar to those from the traditional method. And it indicated that the LiDAR is sufficient to be a alternative of a traditional method. However, there was a limitation in assessing the accuracy of LiDAR for measuring tree height by comparing the measurements by observer's eyes since they included different error sources. Further study is needed to assess the accuracy of LiDAR instrument for tree height through more reliable measurements.

본 연구에서는 흉고직경, 수고 등 산림지역 수목의 기하학적 구조 측정을 위한 휴대용 라이다 장비의 활용성을 평가하였다. 휴대용 라이다 장비의 정확도를 파악하기 위하여 태백산국립공원 내 대상지역(30m×30m)을 선정하고 매목조사를 통해 흉고직경과 수고를 측정하였다. 또, 라이다 장비의 활용성에 대한 객관적인 평가를 위해 편향, 평균제곱근오차, 절대평균오차, 상관계수 등 4가지 통계지표를 활용하였다. 분석결과, 흉고직경의 경우 매목조사와 휴대용 라이다 장비를 이용한 측정치가 거의 유사한 것으로 나타났으며, 휴대용 라이다 장비는 기존의 조사방식을 대체하기에 충분하였다. 그러나, 매목조사에 의한 수고 측정치는 다양한 오차를 포함하고 있어 라이다의 정확도를 파악하기에는 한계가 있었다. 향후 보다 신뢰성 있는 수고 측정방법을 통해 수집된 자료로부터 라이다 장비의 정확도를 평가하는 연구가 필요할 것으로 생각된다.

Keywords

Acknowledgement

이 논문은 국립공원공단 국립공원연구원의 '라이다 기반의 식생구조 측정방법 도입 연구'의 지원으로 수행되었음.

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