生物多様性管理と林業ジャーナル

LiDAR Data Analysis with Fusion/LDV for Individual Tree Measurement

Hiromi Shiota, Kazuhiro Tanaka and Keiko Nagashima

Objective:
In recent years, many analyses have been conducted on the vertical structure of the forest using airborne LiDAR data. For analyze LiDAR data, analysis software is developed in Europe and USA. The forest conditions are quite differences between these country and Japan. In this study, we used Fusion/LiDAR Data Viewer (LDV) software that developed in USA, as a tool to analyze LiDAR data. The purpose of this study is to verify the efficacy of Fusion/LDV in Japanese forest management, in terms of function, accuracy, andtype of output obtained using this software.
Methods:
The verification parameters used in this study were tree height, crown base height (CBH), and crown width (CW). We used three data sources –automatically extracted Fusion/LDV data, manually measured Fusion/LDV data, and field survey data. In order to compare the obtained data, we used scatter diagram analysis, root-mean-square error (RMSE), and differences from three different types of field survey data.
Results:
The study findings confirmed relatively high precision of both the automatic and manual measurements by Fusion/LDV in estimating tree height. The inclination of linear regression was over 0.9 in two survey areas. The results of R square were over 0.7. But while neither the measurement of CBH nor that of CW had such precision. The inclination of linear regression was near zero or minus values.
Conclusion:
For individual tree height measurement, Fusion/LDV was very useful when a tree have a clear peak, it was available enough in Japanese forest environment.