cff-version: 1.2.0
abstract: "<p>This dataset contains digital soil maps (.tiff) of predicted soil contents of oxalate-extractable iron and aluminium at a&nbsp;25 m spatial resolution across six depth layers (0-5 cm, 5-10 cm, 10-25 cm, 25-60 cm, 60-100 cm and 100-200 cm) for agricultural fields in the Netherlands. For each of these depth layers, there is a map of mean predictions, the 5th, 50th (median) and 95th quantile predictions, as well as the 90% prediction interval (PI90 = 95th - 5th quantile) and prediction interval ratio (PIR = PI90 / median). PI90 and PIR represent absolute and relative&nbsp;uncertainty predictions, respectively. The maps were created using Quantile Regression Forest models, which were calibrated using geo-referenced wet-chemical measurements (n = 12,110) and near-infrared (NIR) estimates (n = 102,393) of oxalate-extractable iron and aluminium and over 150 spatial covariates (spatially explicit environmental variables of soil forming factors). See publication for details, including the assessment of map quality using design-based statistical inference.</p><p><br></p>"
authors:
  - family-names: van Doorn
    given-names: Maarten
    orcid: "https://orcid.org/0000-0001-9197-5687"
  - family-names: Helfenstein
    given-names: Anatol
    orcid: "https://orcid.org/0000-0003-2432-2672"
  - family-names: Ros
    given-names: Gerard H.
    orcid: "https://orcid.org/0000-0002-6062-9770"
  - family-names: Heuvelink
    given-names: Gerard B.M.
    orcid: "https://orcid.org/0000-0003-0959-9358"
  - family-names: van Rotterdam-Los
    given-names: Debby
    orcid: "https://orcid.org/0000-0002-0582-6261"
  - family-names: Verweij
    given-names: Sven E.
    orcid: "https://orcid.org/0000-0002-5573-3952"
  - family-names: de Vries
    given-names: Wim
    orcid: "https://orcid.org/0000-0001-9974-0612"
title: "Digital Soil Maps underlying the publication &#34;high-resolution digital soil mapping of amorphous iron- and  aluminium-(hydr)oxides to guide sustainable phosphorus and carbon management&#34;"
keywords:
version: 1
identifiers:
  - type: doi
    value: 10.4121/96c54816-4e36-4285-89fd-a63e478f9acd.v1
license: CC BY 4.0
date-released: 2024-02-29