ACKNOWLEDGEMENTS xvii LIST OF PARTICIPANTS xix PLENARY SESSIQNS KRIGE D.G., GUARASCIO M. and CAMISANI-CALZOLARI F.A. Early South African qeostatistical techniques in today's perspective . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 MATHERON G. The internal consistency of models in qeostatistics............ 21 MONESTIEZ P., HABIB R. and AUDERGON J.M. Estimation de la covariance et du varioqramme pour une fonction aleatoire a support arborescent : application a l'etude des arbres fruitiers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 CHILES J.P. Modelisation qeostatistique de reseaux de fractures............ 57 BRUNO R. and RASPA G. Geostatistical characterization of fractal models of surfaces 17 RIVOIRARD J. Models with orthoqonal indicator residuals..................... 91 OMRE H., HALVORSEN K.B. and BERTEIG V. A Bayesian approach to kriqinq ................................. 109 THEQRY I SWITZER P. Non-stationary spatial covariances estimated from monitorinq data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127 CHAUVET P. Quelques aspects de l'analyse structurale des FAI-k a 1 dimension.................................................... 139 vi TABLE OF CONTENTS DOWD P.A. Generalised cross-covariances ................................... 151 CRESSIE N. The many faces of spatial prediction .. ...... ...... . . .. . 163 OBLED C. & BRAUD I. Analogies entre geostatistique et analyse en composantes principales de processus ou analyse EOFs...................... 177 THEORY II JEULIN D. Sequential random functions models............................ 189 CHAUTRU J.M. The use of Boolean random functions in geostatistics . . .... 201 SOARES A.O. Use of a mathematical morphology tool in characterizing covariance& of indicator data.................................. 213 ALLISON H.J. Regularization in geostatistics and in ill-posed inversed problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225 DONG A.