Estimation of Stand Attributes in Cryptomeria japonica and Chamaecyparis obtusa Stands from Single Tree Detection using Small-Footprint Airborne LiDAR Data(<Special Issue>Silvilaser)

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概要

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• Stand attributes such as stand density, stand height, stand volume, are important factors for sustainable forest management. This study aimed to estimate stand attributes in Cryptomeria japonica and Chamaecyparis obtusa stands in Japan from single tree detection using small-footprint airborne LiDAR data. Twenty circular sample plots of 0.04ha were established for this study. Their stand densities were estimated from the number of treetops derived from airborne LiDAR data using the local maximum filtering method. Stand densities derived from the field survey in the sample plots were compared with those obtained from airborne LiDAR data. The coefficient of determination between them was 0.92. Stand densities which were estimated from the airborne LiDAR data, were underestimated in both young and mature stands. Stand heights, which were estimated from the airborne LiDAR data, were slightly overestimated, but they were almost the same as the mean heights of dominant standing trees. Allometric equations between diameter at breast height (DBH) and crown area obtained from airborne LiDAR data were determined for each of two species, i.e., Cryptomeria japonica and Chamaecyparis obtusa, and DBH of individual trees was estimated from the airborne LiDAR data. Stand volumes were estimated from the cumulative individual volumes, which were derived from volume formulas with two variables, i.e., DBH and height, both obtained from airborne LiDAR data. Stand volumes derived from the field survey were compared with those obtained from the airborne LiDAR data. The coefficient of determination was 0.86. Stand volumes which were estimated from the airborne LiDAR data, were underestimated because of the lack of suppressed tree volume; however, the degree of underestimation was relatively low.

• 森林計画学会の論文

著者

• Yamamoto Hirokazu

  Graduate School Of Frontier Sciences The University Of Tokyo

• Hirata Yasumasa

  Shikoku Research Center Forestry And Forest Products Research Institute

• Suzuki Makoto

  University Forest In Chiba Graduate School Of Agricultural And Life Sciences The University Of Tokyo

• Fruya Naoyuki

  Department Of Forest Management Forestry And Forest Products Research Institute

• Yamamoto Hirokazu

  Graduate School Of Agricultural And Life Sciences The University Of Tokyo

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