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Record nummer 104115
Titel Numerical classification of soils and its application in survey
toon extra info.
J.J. de Gruijter
Auteur(s) Gruijter, J.J. de
Uitgever Wageningen : Pudoc
Jaar van uitgave 1977
Pagina's 117 p + 5 losse bijl
Annotatie(s) Proefschrift Wageningen
Ook verschenen als handelsuitgave
Ook verschenen als handelsuitgave
ISBN 9022006085
Tutor(s) Bennema, Prof. Dr. Ir. J. ; Corsten, Prof. Dr. Ir. L.C.A.
Promotiedatum 1977-03-11
Proefschrift nr. 677
Samenvatting door auteur toon abstract

Numerical classification of soils was studied with emphasis on methodology and feasibility in survey. A procedure was designed for construction of classes sufficiently homogeneous in terms of relevant properties and handlable by the surveyor. In the procedure 'central' depth-profiles are calculated separately for each property (e.g. clay content), from a sample of depth-profiles, with a relocation method minimizing within-class variances. Any soil profile can thus be identified in the field by allocating its constituent depth-profiles to the central depth-profile that is most similar for the respective properties. Resulting strings of class labels serve for interim data recording. If too many combinations of central depth-profiles arise to map all individually, they are fused into larger classes and within-class variances are again minimized. This procedure was applied to survey data from a marine clay area in the Netherlands: field estimates for 6 properties in 2212 profiles divided into 20 depth intervals. A new method was used to map classes automatically. Tests showed that: samples of several hundred profiles were needed; order of profiles and initial solution for relocation had little effect on results; only extreme weighting significantly affected homogeneity for different variables. Choice of weights and number of classes should be related and supported by sensitivity analysis.

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Trefwoorden (cab) classificatie / horizonten / landevaluatie / bodemclassificatie / bodemkunde / bodemgeschiktheid / bodemkarteringen / bodemtaxonomie / bodemtypen / cartografie
Rubrieken Bodemclassificatie
Publicatie type Proefschrift
Taal Engels
Toelichting Stiboka onderzoek
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