Mathematical Geosciences

, Volume 41, Issue 5, pp 509–533

Application of FFT-based Algorithms for Large-Scale Universal Kriging Problems

Article

Abstract

Looking at kriging problems with huge numbers of estimation points and measurements, computational power and storage capacities often pose heavy limitations to the maximum manageable problem size. In the past, a list of FFT-based algorithms for matrix operations have been developed. They allow extremely fast convolution, superposition and inversion of covariance matrices under certain conditions. If adequately used in kriging problems, these algorithms lead to drastic speedup and reductions in storage requirements without changing the kriging estimator. However, they require second-order stationary covariance functions, estimation on regular grids, and the measurements must also form a regular grid. In this study, we show how to alleviate these rather heavy and many times unrealistic restrictions. Stationarity can be generalized to intrinsicity and beyond, if decomposing kriging problems into the sum of a stationary problem and a formally decoupled regression task. We use universal kriging, because it covers arbitrary forms of unknown drift and all cases of generalized covariance functions. Even more general, we use an extension to uncertain rather than unknown drift coefficients. The sampling locations may now be irregular, but must form a subset of the estimation grid. Finally, we present asymptotically exact but fast approximations to the estimation variance and point out application to conditional simulation, cokriging and sequential kriging. The drastic gain in computational and storage efficiency is demonstrated in test cases. Especially high-resolution and data-rich fields such as rainfall interpolation from radar measurements or seismic or other geophysical inversion can benefit from these improvements.

Keywords

Fast Fourier transform Efficient geostatistical estimation Spectral methods Superfast Toeplitz solver 

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Copyright information

© International Association for Mathematical Geosciences 2009

Authors and Affiliations

  1. 1.Institute of Hydraulic Engineering, Department of Hydromechanics and Modeling of HydrosystemsUniversität StuttgartStuttgartGermany
  2. 2.Institute for Fluid MechanicsLeibniz Universität HannoverHannoverGermany
  3. 3.Civil and Environmental EngineeringUniversity of CaliforniaBerkeleyUSA

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