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Forest Type Differentiation Using GLAD Phenology Metrics, Land Surface Parameters, and Machine Learning

Author

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  • Faith M. Hartley

    (Department of Geology and Geography, West Virginia University, Morgantown, WV 26505, USA
    These authors contributed equally to this work.)

  • Aaron E. Maxwell

    (Department of Geology and Geography, West Virginia University, Morgantown, WV 26505, USA
    These authors contributed equally to this work.)

  • Rick E. Landenberger

    (Department of Geology and Geography, West Virginia University, Morgantown, WV 26505, USA)

  • Zachary J. Bortolot

    (Geography Program, James Madison University, Harrisonburg, VA 22807, USA)

Abstract

This study investigates the mapping of forest community types for the entire state of West Virginia, United States, using Global Land Analysis and Discovery (GLAD) Phenology Metrics, Analysis Ready Data (ARD) derived from Landsat time series data, and digital terrain variables derived from a digital terrain model (DTM). Both classifications and probabilistic predictions were made using random forest (RF) machine learning (ML) and training data derived from ground plots provided by the West Virginia Natural Heritage Program (WVNHP). The primary goal of this study was to explore the use of globally consistent ARD for operational forest type mapping over a large spatial extent. Mean overall accuracy calculated from 50 model replicates for differentiating seven forest community types using only variables selected from the 188 GLAD Phenology Metrics used in the study resulted in an overall accuracy (OA) of 54.3% (map-level image classification efficacy (MICE) = 0.433). Accuracy increased to a mean OA of 64.8% (MICE = 0.496) when the Oak/Hickory and Oak/Pine classes were combined into an Oak Dominant class. Once selected terrain variables were added to the model, the mean OA for differentiating the seven forest types increased to 65.3% (MICE = 0.570), while the accuracy for differentiating six classes increased to 76.2% (MICE = 0.660). Our results highlight the benefits of combining spectral data and terrain variables and also the enhancement of the product’s usefulness when probabilistic predictions are provided alongside a hard classification. The GLAD Phenology Metrics did not provide an accuracy comparable to those obtained using harmonic regression coefficients; however, they generally outperformed models trained using only summer or fall seasonal medians and performed comparably to those trained using spring medians. We suggest further exploration of the GLAD Phenology Metrics as input for other spatial predictive mapping and modeling tasks.

Suggested Citation

  • Faith M. Hartley & Aaron E. Maxwell & Rick E. Landenberger & Zachary J. Bortolot, 2022. "Forest Type Differentiation Using GLAD Phenology Metrics, Land Surface Parameters, and Machine Learning," Geographies, MDPI, vol. 2(3), pages 1-25, August.
    • Handle: RePEc:gam:jgeogr:v:2:y:2022:i:3:p:30-515:d:888486
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    References listed on IDEAS

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    2. Nicolas Gruber & James N. Galloway, 2008. "An Earth-system perspective of the global nitrogen cycle," Nature, Nature, vol. 451(7176), pages 293-296, January.
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