| Title: | Regional Applicability of Forest Height and Aboveground Biomass Models for the Geoscience Laser Altimeter System. |
| Authors: | Pflugmacher, Dirk
Cohen, Warren
Kennedy, Robert
Lefsky, Michael
USDA, FS |
| Source: | Forest science. 2008 Dec., v. 54, no. 6, p. 647-657. |
| NALT Subjects: | forests
measurement
forest trees
biomass
height
remote sensing
lidar
lasers
estimation
models
carbon sequestration
geographical variation
ecoregions
forest types
algorithms
United States |
| Other Subjects: | regional applicability
laser scanning |
| Issue Date: | Dec-2008 |
| Abstract: | Accurate estimates of forest aboveground biomass are needed to reduce uncertainties in global and regional terrestrial carbon fluxes. In this study we investigated the utility of the Geoscience Laser Altimeter System (GLAS) onboard the Ice, Cloud and land Elevation Satellite for large-scale biomass inventories. GLAS is the first spaceborne lidar sensor that will provide global estimates of forest height. We compared accuracy and regional variability of GLAS height estimates with data from the US Forest Service Inventory and Analysis (FIA) program and found that current GLAS algorithms provided generally accurate estimates of height. GLAS heights were on average 2-3 m lower than FIA estimates. To translate GLAS-estimated heights into forest biomass will require general allometric equations. Analysis of the regional variability of forest height-biomass relationships using FIA field data indicates that general nonspecies specific equations are applicable without a significant loss of prediction accuracy. We developed biomass models from FIA data and applied them to the GLAS-estimated heights. Regional estimates of forest biomass from GLAS differed between 39.7 and 58.2 Mg ha-1 compared with FIA. |
| URI: | http://hdl.handle.net/10113/27150 |
| Appears in Collections: | USDA Research and Information
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