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Resurrection of Soil Surveys: A case study of the acid sulphate soils of The Gambia. II. Added value from spatial statistics
Author(s) -
Ahmed F. B.,
Dent D. L.
Publication year - 1997
Publication title -
soil use and management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.709
H-Index - 81
eISSN - 1475-2743
pISSN - 0266-0032
DOI - 10.1111/j.1475-2743.1997.tb00557.x
Subject(s) - spurious relationship , kriging , soil water , spatial variability , range (aeronautics) , soil survey , statistics , environmental science , spatial analysis , geostatistics , soil map , hydrology (agriculture) , floodplain , soil science , mathematics , geography , geology , cartography , materials science , geotechnical engineering , composite material
. Kriging is used to provide detailed quantitative information for a range of soil characteristics across the floodplain of the River Gambia. Application of spatial statistics to a large area with a coarse grid of data points produces spurious patterns unless the area is first partitioned into soil‐geomorphic mapping units, each of which has a unique pattern of spatial variation. Even combining classical soil survey method with spatial statistics, the large short‐range variability of acid sulphate soils means that single factor maps conceal a large element of uncertainty. A more robust procedure is to map the probability of occurrence of critical values of key characteristics.