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Amélie Marie Beucher

Development of hierarchical terron workflow based on gridded data – A case study in Denmark

Publikation: KonferencebidragKonferenceabstrakt til konferenceFormidling

Defining homogeneous zones by soil, climate, and landscape is a first step in creating terroir units. Terrons are defined as areas similar in soil and landscape. While applications in delineating homogeneous zones are commonly interested in all land management types (urban, forest, agriculture, etc.) or vegetation specific, terron mapping is one method for creating non-vegetation specific homogeneous zones specifically for agricultural management and environmental assessment. In this study, a workflow was developed that automates the necessary steps in generating terron classes. The workflow is flexible by allowing the user to define different input variables, method of modeling, output resolution, and hierarchical terrons. As a case study, terron classes are modeled and mapped in Denmark: 1) using fuzzy c-means with various soil and climate grid data to identify national regions, and 2) using k-means to develop regional terrons based on soil and landscape grid data. The elbow method was applied to determine the optimal number of national terron classes, dividing Denmark into three national regions. Each national region was further divided into nine regional terrons (this number being selected because of the nine soil classes in Denmark). The resulting regional terron map is comprised of 27 terrons. National and regional terrons are defined at 304 m and 30.4 m resolutions, respectively. They are both summarized using 25th to 75th percentile values for each variable. A dendrogram produced from regional terron centroids was used to generalize terrons into groups of three to five terrons. From the generalization, seven groups are used to determine terrons that are most promising for crop production or prone to environmental risk, such as erosion. The regional terron map constitutes a useful tool enabling future land-use management decisions and the development of terroirs for Danish crops.
OriginalsprogEngelsk
Udgivelsesår2019
StatusUdgivet - 2019
BegivenhedJoint Workshop for Digital Soil Mapping and GlobalSoilMap - University of Chile, Santiago, Chile
Varighed: 13 mar. 2019 → …

Konference

KonferenceJoint Workshop for Digital Soil Mapping and GlobalSoilMap
LokationUniversity of Chile
LandChile
BySantiago
Periode13/03/2019 → …

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