Stukey, Jared D. (2009-12). Deriving a Framework for Estimating Individual Tree Measurements with Lidar for Use in the TAMBEETLE Southern Pine Beetle Infestation Growth Model. Master's Thesis. Thesis uri icon

abstract

  • The overall goal of this study was to develop a framework for using airborne lidar to derive inputs for the SPB infestation growth model TAMBEETLE. The specific objectives were (1) to estimate individual tree characteristics of XY location, individual bole height (IBH), diameter at breast height (DBH), length of crown (CrHT), and age for use in TAMBEETLE; (2) to estimate individual tree age using lidar-estimated height and site index provided by the United States Department of Agriculture (USDA) Natural Resources Conservation Service (NRCS) Soil Survey Geographic Database (SSURGO); and (3) to compare TAMBEETLE simulation results using field measurements and lidarderived measurements as inputs. Diameter at breast height, individual bole height, and crown length were estimated using lidar with an error for mean measurements at plot level of 0.16cm, 0.19m, and 1.07m, respectively. These errors were within root mean square error (RMSE) for other studies at the study site. Age was estimated using the site index provided by SSURGO and the site index curves created for the study area with an RMSE of 4.8 years for mean plot age. Underestimation of tree height by lidar and error in the site index curve explained 91% of the error in mean plot age. TAMBEETLE was used to compare spot growth between a lidar-derived forest map and a forest map generated by TAMBEETLE, based on sample plot characteristics. The lidar-derived forest performed comparably to the TAMBEETLE generated forest. Using lidar to map forests can provide the large spatial extents of the TAMBEETLE generated forest while maintaining the spatially explicit forest characteristics, which were previously only available through field measurements.
  • The overall goal of this study was to develop a framework for using airborne
    lidar to derive inputs for the SPB infestation growth model TAMBEETLE. The specific
    objectives were (1) to estimate individual tree characteristics of XY location, individual
    bole height (IBH), diameter at breast height (DBH), length of crown (CrHT), and age for
    use in TAMBEETLE; (2) to estimate individual tree age using lidar-estimated height and
    site index provided by the United States Department of Agriculture (USDA) Natural
    Resources Conservation Service (NRCS) Soil Survey Geographic Database (SSURGO);
    and (3) to compare TAMBEETLE simulation results using field measurements and lidarderived
    measurements as inputs. Diameter at breast height, individual bole height, and
    crown length were estimated using lidar with an error for mean measurements at plot
    level of 0.16cm, 0.19m, and 1.07m, respectively. These errors were within root mean
    square error (RMSE) for other studies at the study site. Age was estimated using the site
    index provided by SSURGO and the site index curves created for the study area with an
    RMSE of 4.8 years for mean plot age. Underestimation of tree height by lidar and error
    in the site index curve explained 91% of the error in mean plot age. TAMBEETLE was used to compare spot growth between a lidar-derived forest map and a forest map
    generated by TAMBEETLE, based on sample plot characteristics. The lidar-derived
    forest performed comparably to the TAMBEETLE generated forest. Using lidar to map
    forests can provide the large spatial extents of the TAMBEETLE generated forest while
    maintaining the spatially explicit forest characteristics, which were previously only
    available through field measurements.

publication date

  • December 2009