Search Results - "Kershaw, John A."

Hierarchical Bayesian models for small area estimation of forest variables using LiDAR by Ver Planck, Neil R., Finley, Andrew O., Kershaw, John A., Weiskittel, Aaron R., Kress, Megan C.

“…Light detection and ranging (LiDAR) data have become almost ubiquitous as a remote sensing tool in forestry estimation and mapping applications. Such…”
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Synthesizing Disparate LiDAR and Satellite Datasets through Deep Learning to Generate Wall-to-Wall Regional Inventories for the Complex, Mixed-Species Forests of the Eastern United States by Ayrey, Elias, Hayes, Daniel J, Kilbride, John B, Fraver, Shawn, John A Kershaw, Jr, Cook, Bruce D, Weiskittel, Aaron R

“…Light detection and ranging (LiDAR) has become a commonly-used tool for generating remotely-sensed forest inventories. However, LiDAR-derived forest…”
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Diameter distribution model development of tropical hybrid Eucalyptus clonal plantations in Sumatera, Indonesia : a comparison of estimation methods by Waldy, Joni

“…Compares different recovery methods for predicting parameters of the 3-parameter Weibull distribution for characterising diameter distributions of Eucalyptus…”
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Fine-root dynamics change during stand development and in response to thinning in balsam fir (Abies balsamea L. Mill.) forests by Olesinski, Jakub, Lavigne, Michael B., Kershaw, John A., Krasowski, Marek J.

“…► We studied age-related changes in fine root dynamics and responses to thinning. ► Fine root NPP did not decline with stand age after increasing in early…”
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Comparing strategies for modeling individual-tree height and height-to-crown base increment in mixed-species Acadian forests of northeastern North America by Russell, Matthew B, Weiskittel, Aaron R, Kershaw, John A., Jr

“…Various methods for predicting annual tree height increment (∆ht) and height-to-crown base increment (∆hcb) were developed and evaluated using remeasured data…”
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Application of big BAF sampling for estimating carbon on small woodlots by Chen, Yingbing, Yang, Ting-Ru, Hsu, Yung-Han, Kershaw, John A., Prest, Dale

“…Background To accurately and efficiently quantify forest carbon stocks, a good forest inventory using appropriate sampling that minimizes costs and human…”
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Species differences in total and vertical distribution of branch- and tree-level leaf area for the five primary conifer species in Maine, USA by Weiskittel, Aaron R., Kershaw, John A., Hofmeyer, Philip V., Seymour, Robert S.

“…Vertical distribution of leaf area largely governs both tree structure and function. Models of this important tree attribute have been constructed for several…”
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An imputation/copula-based stochastic individual tree growth model for mixed species Acadian forests: a case study using the Nova Scotia permanent sample plot network by Kershaw, John A., Weiskittel, Aaron R., Lavigne, Michael B., McGarrigle, Elizabeth

“…Background A novel approach to modelling individual tree growth dynamics is proposed. The approach combines multiple imputation and copula sampling to produce…”
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Evaluating annual spruce budworm defoliation using change detection of vegetation indices calculated from satellite hyperspectral imagery by Donovan, Shawn D., MacLean, David A., Zhang, Yun, Lavigne, Michael B., Kershaw, John A.

“…During spruce budworm (SBW; Choristoneura fumiferana (Clem.)) outbreaks, defoliation causes severe tree damage and mortality to spruce-balsam fir (Picea…”
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Layer Stacking: A Novel Algorithm for Individual Forest Tree Segmentation from LiDAR Point Clouds by Elias Ayrey, Shawn Fraver, John A. Kershaw, Laura S. Kenefic, Daniel Hayes, Aaron R. Weiskittel, Brian E. Roth

“…As light detection and ranging (LiDAR) technology advances, it has become common for datasets to be acquired at a point density high enough to capture…”
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Post-gall induction performance of Adelges Abietis (L.) (Homoptera: Adelgidae) is influenced by clone, shoot length, and density of colonising gallicolae by FLAHERTY, LEAH, QUIRING, DAN, KERSHAW, JOHN A. Jr

“…1. We evaluated the effect of clone (one susceptible and one resistant clone), shoot length, crown level, and gallicola density on post-gall induction…”
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Evaluating the potential of red spruce (Picea rubens Sarg.) to persist under climate change using historic provenance trials in eastern Canada by Li, Wushuang, Kershaw, John A., Costanza, Kara K.L., Taylor, Anthony R.

“…•No deleterious effects of warming were observed for the northern populations.•Warmer-adapted provenances moved to colder conditions resulted in smaller…”
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Spatial Tree Mapping Using Photography by Dick, Adam R, Kershaw, John A, MacLean, David A

“…Stem maps describing the spatial location of trees sampled in a forest inventory are used increasingly to model relationships between neighboring trees in…”
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Approaches for modeling vertical distribution of maximum knot size in black spruce: a comparison of fixed- and mixed-effects nonlinear models by Kershaw, John A. Jr, Benjamin, Jeff G, Weiskittel, Aaron R

“…Both linear and nonlinear hierarchical mixed-effects models have been used in recent years to analyze nested data sets. These types of models are effective for…”
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The development of allometric systems of equations for compatible area-based LiDAR-assisted estimation by Yang, Ting-Ru, Kershaw, John A, Ducey, Mark J

“…Abstract Light detection and ranging (LiDAR) is used to estimate tree, stand and forest characteristics across large geographic areas. In most analyses,…”
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Needle longevity of balsam fir is increased by defoliation by spruce budworm by Doran, Olivia, MacLean, David A., Kershaw, John A.

“…Key message Retention of 10–16-year-old balsam fir needles increased significantly with cumulative spruce budworm defoliation. Mean needle longevity on…”
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Influence of sample selection method and estimation technique on sample size requirements for wall-to-wall estimation of volume using airborne LiDAR by Yang, Ting-Ru, Kershaw, John A, Weiskittel, Aaron R, Lam, Tzeng Yih, McGarrigle, Elizabeth

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Ecologically-Based Metrics for Assessing Structure in Developing Area-Based, Enhanced Forest Inventories from LiDAR by Elias Ayrey, Daniel J. Hayes, Shawn Fraver, John A. Kershaw, Aaron R. Weiskittel

“…The authors developed a series of ecological metrics (EM) based on mechanistic principles for quantifying light detection and ranging (LiDAR) to develop forest…”
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Alternative expressions for stand diameter in complex forests by Ducey, Mark J., Kershaw, John A.

“…Quadratic mean diameter is the most frequently reported descriptor of the diameter distribution of forests. As such, it is often used as an indicator of forest…”
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What diameter? What height? Influence of measures of average tree size on area-based allometric volume relationships by Wang, Yilin, Kershaw, John A., Ducey, Mark J., Sun, Yuan, McCarter, James B.

“…Volume is an important attribute used in many forest management decisions. Data from 83 fixed-area plots located in central New Brunswick, Canada, are used to…”
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