Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 402530
Title Sampling for validating digital soil maps
Author(s) Brus, D.J.; Kempen, B.
Source In: Pedometrics 2009 Conference. Biennial Meeting of Commission 1.5 Pedometrics - Division 1 of the International Union of Soil Science (IUSS), Beijing, China, 26 - 28 August, 2009. - Beijing, China : China Agricultural University - p. 31 - 31.
Event Beijing, China : China Agricultural University Pedometrics 2009, Beijing, 2009-08-26/2009-08-28
Department(s) SS - Soil Geography
Land Dynamics
Publication type Abstract in scientific journal or proceedings
Publication year 2009
Abstract This paper reviews methods for validation of digital soil maps, and describes how a sampling scheme for validation by additional sampling can be designed. It is argued that validation by selecting additional locations by probability sampling is to be preferred over validation by data-spliiting or by cross-validation. The paper describes the elements of a sampling scheme for collecting an additional sample for validation. This is illustrated by two case studies. The first map validated is a categorical soil map of a province in the Netherlands. User's and producers's accuarcy are estimated by stratified simple random sampling and wih ratio-estimators. The second map depicts topsoil organic matter content for a region in Senegal. As the accessibility to the area is poor, the spatial means of the error and of the squared error are estimated by random transect sampling.
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