Shazrul Azwan Johari (2017) Estimation of forest structure and above ground biomass of different forest reserve using airborne Lidar Data. Masters thesis, Universiti Malaysia Sabah.
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Abstract
Estimating the forest structures and above ground biomass (AGB) in tropical rainforest can be crucial because of the complex and dense forests structure. Light Detection and Ranging (LiDAR) measure the vertical structure of the forests and thus hold great potential for characterizing forest structure and quantifying the AGB on tropical forest. Main goal of this study is to identify the relationships for the metrics derived from airborne LiDAR data with the field observed forest structure and AGB within different forest types (alluvial, sandstone hill and heath) in Sepilok Forest Reserve (SFR). 30 sample plots were established in different forest types with the field-measurement of DBH, height as well as tree species. Using the field-measured data, the basal area (BA), Lorey’s height (LH) and AGB within each plot were calculated. From the LiDAR data, height metrics (HTM) and laser penetration rates (LP) of different height from the ground were derived and stepwise multiple regressions were performed to select variables to establish the estimation models. Best model with the single variable of LP at 20 m height was used to estimate AGB (R2 adj=0.58, RMSE=30.15 %). Single variable also was used for best height model of LP at 16 m height (R2 adj=0.55, RMSE=5.67 %) and LP at 18 m height for BA model (R2 adj=0.76, RMSE=22.15%). Multiple variables of LP at 24 m height and LP at 1 m height worked best for DBH estimation model (R2 adj=0.56, RMSE=8.31%), while HT70th and LP at 1 m height were selected for the LH estimation model (R2 adj=0.88, RMSE=8.64%). The results confirmed the capability of LiDAR data for estimating AGB and forest structure of SFR.
| Item Type: | Thesis (Masters) |
|---|---|
| Keyword: | LiDAR, Above-ground biomass, Forest structure, Tropical rainforest, Sepilok Forest Reserve, LiDAR height metrics |
| Subjects: | S Agriculture > SD Forestry > SD1-669.5 Forestry > SD131-247.5 History of forestry. Forest conditions |
| Department: | FACULTY > Faculty of Science and Natural Resources |
| Depositing User: | DG MASNIAH AHMAD - |
| Date Deposited: | 17 Mar 2025 11:03 |
| Last Modified: | 17 Mar 2025 11:03 |
| URI: | https://eprints.ums.edu.my/id/eprint/43200 |
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