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Weed Mapping with Co-Kriging Using Soil Properties [PDF]

Precision Agriculture, 1999
Our aim is to build reliable weed maps to control weeds in patches. Weed sampling is time consuming but there are some shortcuts. If an intensively sampled variable (e.g. soil property) can be used to improve estimation of a sparsely sampled variable (e.g. weed distribution), one can reduce weed sampling. The geostatistical estimation method co-kriging
Heisel, T, Ersbøll, A. K., Andreasen, C.   +2 more
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Co-kriging for stochastic flow models

Transport in Porous Media, 1989
Co-kriging equations for log-transmissivity and heads are derived for a two-dimensional stochastic model. The behavior of the weights as a function of the unknown value of mean hydraulic gradient J are discussed and the procedure is illustrated by studying the ‘screening’ effects of adjacent measurements and added head measurements.
Allan Gutjahr, John Wilson
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Extended Co-Kriging interpolation method based on multi-fidelity data

Applied Mathematics and Computation, 2018
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Manyu Xiao, Guohua Zhang, Piotr Breitkopf, Pierre Villon, Weihong Zhang   +4 more
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Estimation of linear combinations and co-kriging

Journal of the International Association for Mathematical Geology, 1983
Utilizing the matrix formulation of co-kriging developed previously by the author, the relationship between direct kriging of linear combinations and linear combinations of co-kriged variables is developed. Conditions for equality of the estimators and the kriging variances are examined.
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Co-Kriging Estimation of Nitrate-Nitrogen Loads in an Agricultural River

Water Resources Management, 2016
Daily nitrate-nitrogen (NO3-N) loads in the Raccoon River, Iowa, were estimated using Ordinary kriging (OK), Cokriging (CK), and a standard rating curve method (LOADEST) based on a dataset of 3451 measurements of NO3-N concentration collected over 19 years.
Xiuyu Liang, Keith Schilling, You-Kuan Zhang, Christopher Jones   +3 more
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Co-Kriging — New Developments

1984
Co-Kriging or Joint Estimation utilizes data from correlated variables to improve the estimation of all variables or to compensate for missing data on some variables. The general formulation of Co-Kriging in matrix form was given by the author. The matrix form emphasizes the analogy with Kriging of one variable utilizing only spatial dependence ...
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Co-Kriging strategy for structural health monitoring of bridges

Structural Health Monitoring
Computational models are crucial in applied science and engineering, offering valuable insights on the behavior of strutures and mechanical systems. However, their effectiveness is often hindered by complexity and substantial time required for execution.
Henrique Cordeiro Novais, Samuel da Silva, Eloi Figueiredo   +2 more
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RECURSIVE CO-KRIGING MODEL FOR DESIGN OF COMPUTER EXPERIMENTS WITH MULTIPLE LEVELS OF FIDELITY

International Journal for Uncertainty Quantification, 2014
We consider in this paper the problem of building a fast-running approximation—also called surrogate model—of a complex computer code. The co-kriging based surrogate model is a promising tool to build such an approximation when the complex computer code can be run at different levels of accuracy.
Le Gratiet, Loic, Garnier, Josselin
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Combustor Design Optimisation Using Co-Kriging of Steady and Unsteady Turbulent Combustion

Volume 2: Combustion, Fuels and Emissions, Parts A and B, 2011
In the gas turbine industry, computational fluid dynamics (CFD) simulations are often used to predict and visualize the complex reacting flow dynamics, combustion environment and emissions performance of a combustor at the design stage. Given the complexity involved in obtaining accurate flow predictions and due to the expensive nature of simulations ...
Wankhese, Moresh J., Bressloff, Neil W., Keane, Andy J.   +2 more
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A new form of the cokriging equations

Mathematical Geology, 1997
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Long, Andrew E., Myers, Donald E.
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