||Estimating Soil Water Content Using Cokriging.
Yates, S. R. ;
Warrick, A. W. ;
||Robert S. Kerr Environmental Research Lab., Ada, OK. ;Arizona Agricultural Experiment Station, Tucson.
Soil water ;
Random functions ;
Surface temperature ;
Moisture content ;
GMC(Gravimetric Moisture Content)
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||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.)
||Pub. in Soil Science Society of America Jnl., v51 n1 p23-30 Jan/Feb 87. Prepared in cooperation with Arizona Agricultural Experiment Station, Tucson.
|NTIS Title Notes
||Reprint: Estimating Soil Water Content Using Cokriging.
|PUB Date Free Form
||PC A02/MF A01