• Title/Summary/Keyword: 식생환경

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Evaluation of vegetation index accuracy based on drone optical sensor (드론 광학센서 기반의 식생지수 정확도 평가)

  • Lee, Geun Sang;Cho, Gi Sung;Hwang, Jee Wook;Kim, Pyoung Kwon
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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    • v.40 no.2
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    • pp.135-144
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    • 2022

  • Since vegetation provides humans with various ecological spaces and is also very important in terms of water resources and climatic environment, many vegetation monitoring studies using vegetation indexes based on near infrared sensors have been conducted. Therefore, if the near infrared sensor is not provided, the vegetation monitoring study has a practical problem. In this study, to improve this problem, the NDVI (Normalized Difference Vegetation Index) was used as a reference to evaluate the accuracy of the vegetation index based on the optical sensor. First, the Kappa coefficient was calculated by overlapping the vegetation survey point surveyed in the field with the NDVI. As a result, the vegetation area with a threshold value of 0.6 or higher, which has the highest Kappa coefficient of 0.930, was evaluated based on optical sensor based vegetation index accuracy. It could be selected as standard data. As a result of selecting NDVI as reference data and comparing with vegetation index based on optical sensor, the Kappa coefficients at the threshold values of 0.04, 0.08, and 0.30 or higher were the highest, 0.713, 0.713, and 0.828, respectively. In particular, in the case of the RGBVI (Red Green Red Vegetation Index), the Kappa coefficient was high at 0.828. Therefore, it was found that the vegetation monitoring study using the optical sensor is possible even in environments where the near infrared sensor is not available.

  • https://doi.org/10.7848/ksgpc.2022.40.2.135 인용 PDF KSCI

Assessment of Riverine Vegetation based on Hydrological Regime (수문학적 조건을 고려한 하천환경 연구)

  • Kwak, Jaewon;Kim, Taehyung;Kim, Keuksoo;Park, Jungsool;Park, Yongwoon
    • Proceedings of the Korea Water Resources Association Conference
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    • 2017.05a
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    • pp.518-518
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    • 2017

  • Since Korea lunched the 4 Major River Restoration Project, the hydrological regime which is one of the major determinants for riverine condition have actually changed. It also important to connect hydrological characteristics and vegetation. The objective of this study is to investigate the influence of hydrological regime on riverine vegetations and its successions. Iunundated exceedance probability concept are suggested to estimate rehabilitated and succession on the Binae island in the Han River. The result shows that the P=0.08 or lower IEPs should have the disturbance for vegetations, or should be changed to a hydrophilic ones. Therefore, agency which is mainly responsible for river and flow may have to be changed and considered flow regulation standard to conserve riverine zone.

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