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• W2887281737 abstract "Forest-related statistics, including forest biomass, carbon sink, and the prevention of forest fires, can be obtained by estimating stand density. In this study, a dataset with the laser pulse density of 225.5 pulses/m2 was obtained using airborne laser scanning in a tropical broadleaf forest. Three digital surface models (DSMs) were generated using first-echo, last-echo, and highest first-echo data. Three canopy height models (CHMs) were obtained by deducting the digital elevation model from the three DSMs. The cell sizes (Csizes) of the CHMs were 1, 0.5, and 0.2 m. In addition, stand density was estimated using CHM data and following the local maximum method. The stand density of 35 sample regions was acquired via in-situ measurement. The results indicated that the root-mean-square error (RMSE) ranged between 1.68 and 2.43; the RMSE difference was only 0.78, indicating that stand density was effectively estimated in both cases. Furthermore, regression models were used to correct the error in stand density estimations; the RMSE after correction was called RMSE′. A comparison of the RMSE and RMSE′ showed that the average value decreased from 12.35 to 2.66, meaning that the regression model could effectively reduce the error. Finally, a comparison of the effects of different laser pulse densities on the RMSE value showed that, in order to obtain the minimum RMSE for stand density, the laser pulse density must be greater than 10, 30, and 125 pulses/m2 at Csizes of 1, 0.5, and 0.2 m, respectively." @default.
• W2887281737 created "2018-08-22" @default.
• W2887281737 creator A5042006556 @default.
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• W2887281737 date "2018-08-04" @default.
• W2887281737 modified "2023-10-14" @default.
• W2887281737 title "Estimating Stand Density in a Tropical Broadleaf Forest Using Airborne LiDAR Data" @default.
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• W2887281737 doi "https://doi.org/10.3390/f9080475" @default.
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