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Application of Portable Terrestrial Laser Scanner to a Secondary Broad-Leaved Forest

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Abstract (2. Language): 
In order to conduct further verification of measuring broad-leaved forests using a low-cost portable Terrestrial Laser Scanner (TLS), the present study measured a secondary broad-leaved forest of the Funyu experimental forest, Utsunomiya University, Japan. Then, DBH, height, top end diameter, sweep, and stem volume were analyzed and compared with results of coniferous plantation forests using terrestrial LiDAR. RMSE of DBH was 1.91 cm, which was higher than that of coniferous plantation forests. However, DBH was typically rounded to 2 cm; therefore, RMSEs of DBH were within the allowable range. Furthermore, species did not affect the accuracy of DBH mensuration. The RMSE of height was 2.26 m, which was similar to 2.29 m of the 32-year-old coniferous plantation forest with high stand density. RMSE of height outside the plot was higher than that inside the plot because distances from the portable TLS to trees were too short to measure the heights of trees. The log detection rate was 79.22% in the present study, whereas it was 85.23% in the coniferous plantation forest. RMSE of top end diameter was lower than that of the coniferous plantation forest because the broad-leaved trees were extracted manually in the present study, whereas coniferous trees were extracted automatically. Errors in top end diameters increased with increasing top end heights because the number of points decreased. The RMSE of sweep was much higher than that of coniferous plantation trees. The RMSE of stem volume was 14.3%, which was lower than that of the coniferous plantation forest, despite the low-cost portable TLS, because of lower RMSEs of top end diameters and shorter distances from the portable TLS.
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