Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Estimating Soil Water Content Using Cokriging.
Author Yates, S. R. ; Warrick, A. W. ;
CORP Author Robert S. Kerr Environmental Research Lab., Ada, OK. ;Arizona Agricultural Experiment Station, Tucson.
Year Published 1987
Report Number EPA/600/J-87/060;
Stock Number PB87-212940
Additional Subjects Soil water ; Estimating ; Random functions ; Surface temperature ; Sands ; Geophysics ; Moisture content ; Cokriging ; Kriging ; GMC(Gravimetric Moisture Content)
Library Call Number Additional Info Location Last
NTIS  PB87-212940 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/21/1988
Collation 10p
Using cokriging, estimates and estimation variances of the gravimetric moisture content (GMC) were made using one and two additional random functions: the bare soil surface temperature and the percent sand content. Various measures of the differences and quality of the estimates for kriging and cokriging were calculated and compared on the basis of the sample correlation and whether the auxiliary random functions were over-sampled with respect to the GMC. The average estimation variance for cokriging compared to kriging was reduced for all levels of absolute sample correlation considered (i.e., 0.15-0.83). It was found that the additional complexity of cokriging may be justified when the magnitude of the sample correlation exceeded 0.5 and the auxiliary functions were over-sampled with respect to the GMC. (Copyright (c) Soil Science of America Journal, January-February, 1987.)