Sampling for validating digital soil maps

D.J. Brus, B. Kempen

Research output: Chapter in Book/Report/Conference proceedingAbstract

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.
Original languageEnglish
Title of host publicationPedometrics 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
Place of PublicationBeijing, China
PublisherChina Agricultural University
Pages31
Publication statusPublished - 2009
EventPedometrics 2009 - Beijing, China
Duration: 26 Aug 200928 Aug 2009

Conference

ConferencePedometrics 2009
Country/TerritoryChina
CityBeijing
Period26/08/0928/08/09

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