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https://hdl.handle.net/2440/36892
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dc.contributor.author | Pardo-Iguzquiza, E. | - |
dc.contributor.author | Dowd, P. | - |
dc.date.issued | 2003 | - |
dc.identifier.citation | Computers and Geosciences, 2003; 29(8):1013-1020 | - |
dc.identifier.issn | 0098-3004 | - |
dc.identifier.uri | http://hdl.handle.net/2440/36892 | - |
dc.description | Copyright © 2003 Elsevier Ltd. All rights reserved. | - |
dc.description.abstract | The authors describe the structure and implementation of SPECSIM2, an ANSI Fortran-77 program for simulating anisotropic two-dimensional random fields via a spectral approach. This new program overcomes the limitation of the previously published version (Pardo-Igúzquiza and Chica-Olmo, Comput. Geosci. 20 (4) (1994) 597), which was confined to the direct generation of isotropic fields with any anisotropy imposed by a subsequent co-ordinate transformation. The diagonal symmetry of the two-dimensional covariance function with respect to the origin, i.e. C(x,y)=C(−x,−y) and C(x,−y)=C(−x,y), implies that its Fourier transform (i.e. the spectral density) is real (the imaginary part vanishes). This observation leads to a straightforward direct simulation of anisotropic fields by the spectral method. Examples are given to demonstrate the performance of the method using semi-variograms with or without nugget effects and with simple or nested structures, as well random fields with several structures that have different anisotropy angles. | - |
dc.description.uri | http://www.sciencedirect.com/science/journal/00983004 | - |
dc.language.iso | en | - |
dc.publisher | Pergamon-Elsevier Science Ltd | - |
dc.source.uri | http://dx.doi.org/10.1016/s0098-3004(03)00102-x | - |
dc.subject | Geostatistics | - |
dc.subject | Spectral simulation | - |
dc.subject | Semi-variogram | - |
dc.subject | Spectral density | - |
dc.subject | Amplitude spectrum | - |
dc.subject | Fast Fourier transform | - |
dc.title | SPECSIM2: a program for spectral simulation of anisotropic two-dimensional random fields | - |
dc.type | Journal article | - |
dc.identifier.doi | 10.1016/S0098-3004(03)00102-X | - |
pubs.publication-status | Published | - |
dc.identifier.orcid | Dowd, P. [0000-0002-6743-5119] | - |
Appears in Collections: | Aurora harvest 6 Civil and Environmental Engineering publications |
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