Use of data from airborne laser scanning (ALS) is a well-established practice for enhancing the accuracy of forest inventories in combination with ground-based observations. For regular monitoring of large areas, wall-to-wall ALS data is economically prohibitive. However, when data are acquired in a strip-sampling mode, ALS can support the estimation of forest resources on large areas such as counties, states, and nations. This study investigated the combined use of ALS data acquired along parallel strips and co-located field observations of live and standing dead trees to estimate aboveground biomass (AGB) at regional and sub-regional levels. The study area comprised the Tanana Inventory Unit (TIU) (138,566 km2), located in interior Alaska, and four sub-regions (106–7282 km2) within the TIU. The field data consisted of 1676 ground observations from six independent field campaigns. Ninety-four plots came from the Forest Inventory and Analysis (FIA) program of the USDA Forest Service. The FIA plots, each consisting of four 1/60 ha subplots, were acquired using a probabilistic sampling design. The remaining ground observations were collected during field inventories across TIU, and consisted of 335 independent field plots and 257 clusters containing up to four plots each. The estimation procedure followed a two-phase sampling design grounded within a hybrid inferential framework, which combines design-based estimation for the first phase and model-based inference in the second phase. Post-stratified estimation by land-cover class indicated that the hybrid estimation obtained 11–55% better precision compared to direct (design-based) estimation based solely on field observations. When the field sample sizes were reduced to 25%, the standard errors for the hybrid estimation increased by 3 to 5 pp. Direct and hybrid estimates were compared for two sub-regions, and the hybrid estimated AGBs were 6.4% and 13.3% larger than the direct estimates. On both these study sub-regions, the 95% confidence interval of the hybrid estimated mean AGB included the direct estimate of the mean and vice versa.
Bibliographical noteFunding Information:
This research is a part of the project “A Joint USFS-NASA Pilot Project to Estimate Forest Carbon Stocks in Interior Alaska by Integrating Field, Airborne and Satellite Data” and is funded by the National Aeronautics and Space Administration (NASA) Carbon Monitoring System (CMS) ( NNX13AQ51G ). The study was carried out as part of the collaboration contract “Estimating Forest and Shrub Aboveground Dry Biomass in the Tanana Valley, Alaska, using Ground Plots and Airborne Lidar Data” (NNG15HA31P) between NASA and the Norwegian University of Life Sciences. We would like to thank Carl Roland, NPS field ecologist with Denali National Park, and the US. Department of Defense and their field forester, Dan Rees, for freely sharing their Denali and DOD field plot measurements with the authors.
- Airborne laser scanning
- Hybrid estimation