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Simple Optimal Sampling Algorithm to Strengthen Digital Soil Mapping Using the Spatial Distribution of Machine Learning Predictive Uncertainty: A Case Study for Field Capacity Prediction

Author

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  • Hyunje Yang

    (Forest Environment and Conservation Department, National Institute of Forest Science, Seoul 02455, Republic of Korea)

  • Honggeun Lim

    (Forest Environment and Conservation Department, National Institute of Forest Science, Seoul 02455, Republic of Korea)

  • Haewon Moon

    (Forest Environment and Conservation Department, National Institute of Forest Science, Seoul 02455, Republic of Korea)

  • Qiwen Li

    (Forest Environment and Conservation Department, National Institute of Forest Science, Seoul 02455, Republic of Korea)

  • Sooyoun Nam

    (Forest Environment and Conservation Department, National Institute of Forest Science, Seoul 02455, Republic of Korea)

  • Jaehoon Kim

    (Forest Environment and Conservation Department, National Institute of Forest Science, Seoul 02455, Republic of Korea)

  • Hyung Tae Choi

    (Forest Environment and Conservation Department, National Institute of Forest Science, Seoul 02455, Republic of Korea)

Abstract

Machine learning models are now capable of delivering coveted digital soil mapping (DSM) benefits (e.g., field capacity (FC) prediction); therefore, determining the optimal sample sites and sample size is essential to maximize the training efficacy. We solve this with a novel optimal sampling algorithm that allows the authentic augmentation of insufficient soil features using machine learning predictive uncertainty. Nine hundred and fifty-three forest soil samples and geographically referenced forest information were used to develop predictive models, and FCs in South Korea were estimated with six predictor set hierarchies. Random forest and gradient boosting models were used for estimation since tree-based models had better predictive performance than other machine learning algorithms. There was a significant relationship between model predictive uncertainties and training data distribution, where higher uncertainties were distributed in the data scarcity area. Further, we confirmed that the predictive uncertainties decreased when additional sample sites were added to the training data. Environmental covariate information of each grid cell in South Korea was then used to select the sampling sites. Optimal sites were coordinated at the cell having the highest predictive uncertainty, and the sample size was determined using the predictable rate. This intuitive method can be generalized to improve global DSM.

Suggested Citation

  • Hyunje Yang & Honggeun Lim & Haewon Moon & Qiwen Li & Sooyoun Nam & Jaehoon Kim & Hyung Tae Choi, 2022. "Simple Optimal Sampling Algorithm to Strengthen Digital Soil Mapping Using the Spatial Distribution of Machine Learning Predictive Uncertainty: A Case Study for Field Capacity Prediction," Land, MDPI, vol. 11(11), pages 1-18, November.
  • Handle: RePEc:gam:jlands:v:11:y:2022:i:11:p:2098-:d:979647
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    References listed on IDEAS

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    1. Vân Anh Huynh-Thu & Alexandre Irrthum & Louis Wehenkel & Pierre Geurts, 2010. "Inferring Regulatory Networks from Expression Data Using Tree-Based Methods," PLOS ONE, Public Library of Science, vol. 5(9), pages 1-10, September.
    2. Hyunje Yang & Hyeonju Yoo & Honggeun Lim & Jaehoon Kim & Hyung Tae Choi, 2021. "Impacts of Soil Properties, Topography, and Environmental Features on Soil Water Holding Capacities (SWHCs) and Their Interrelationships," Land, MDPI, vol. 10(12), pages 1-15, November.
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