Wildfire driven forest vegetation height change comparison
発表者／presenter’s name：〇Seunghyeon Lee 1,2，Youngkeun Song 1,2,3
所属／Affiliation：1 Interdisciplinary Program in Landscape Architecture, Seoul National University, Seoul, Republic of Korea
2 Transdisciplinary Program in Smart City Global Convergence, Seoul National University, Seoul, Republic of Korea
3 Department of Environmental Design, Graduate School of Environmental Studies, Seoul National University, Seoul, Republic of Korea

要旨／Abstract
Wildfires are one of the largest anthropogenic disturbances, and their occurrence has a major impact on ecosystem functions through the changes in forest habitat structure. Remote sensing methods are most commonly used to study wildfire areas, and they are mainly focusing on wildfire-damaged area analysis and vegetation change using spectral satellite data. In addition, aerial LiDAR (Light Detection And Ranging) data can be utilized to identify changes in the vertical structure of vegetation. However, the timing and area of LiDAR data acquisition limit the research extent.
Therefore, in recent years, forest research using spaceborne LiDAR GEDI (Global Ecosystem Dynamics Investigation) has been actively conducted to address these spatio-temporal limitations of airborne LiDAR. The typical forest information derived from GEDI is the canopy relative height, which is widely used for forest height and biomass estimation.
In this study, we used GEDI to analyze changes in vegetation height before and after the wildfire in the forest of Andong, South Korea. The exact wildfire perimeter was identified by calculating the NBR (Normalized Burn Ratio) index from Landsat8 imagery. The canopy relative height value of the GEDI was averaged by 10 intervals of canopy relative height and utilized to compare pre-and post-fire vegetation height. The results showed that the post-fire canopy height was lower in all relative height intervals, and the difference became larger as the canopy relative height increased. In addition, the maximum difference between the pre-and post-fire canopy heights was more than 5 meters in the case of a canopy relative height of 50 or more. Therefore, this study confirms that GEDI can provide meaningful results in identifying changes in vegetation height before and after wildfires. These results are differentiated from previous studies that focused only on analyzing fire-induced horizontal changes in vegetation, as they also identified vertical height changes.

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