Quantification of soil textural fractions of Bas-Zaïre using soil map polygons and/or point observations

摘要: Abstract Reconnaissance soil surveys typically produce qualitative choropleth maps and descriptions of sampled profiles. These can be converted to quantitative information directly. Alternatively predictors made by interpolating between the point observations, or two combined. Three methods predict sand clay content Bas-Zaire using a reconnaissance map 151 profiles are compared. A cross-validation showed that combination method produced most precise predictions with an acceptably small bias. This result was obtained only after verifying correcting surveyor's estimations prediction variances stratifying area acquire relative pooled within-stratum variogram.