Mapping optimization based on sampling size in earth related and environmental phenomena |
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Authors: | K Modis G Papantonopoulos K Komnitsas K Papaodysseus |
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Institution: | (1) School of Mining and Metallurgical Engineering, National Technical University of Athens, Athens, Greece;(2) Department of Mineral Resources Engineering, Technical University of Crete, Crete, Greece;(3) School of Electrical and Computer Engineering, National Technical University of Athens, Athens, Greece |
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Abstract: | A critical sampling grid can be defined for an earth related natural variable distributed in space, according to established
theoretical results and under certain mathematical conditions. Sampling above this critical limit does not substantially improve
mapping results, while based on this limit the ideal process of reproducing the original phenomenon is theoretically defined.
The aim of the present paper is, by using an innovative approach; to investigate the validity of commonly used interpolation
algorithms, both stochastic and deterministic, below and above this critical sampling limit. When sampling is dense, application
to a simulated spatial random field shows that the results are equally accurate with those derived with more sophisticated
stochastic methods. On the other hand, when the sampling grid is sparse, deterministic methods produce less accurate results,
therefore stochastic algorithms with minimum estimation error are a much better option. To further demonstrate these points,
the interpolation algorithms were applied in three different sampling grid densities in a contaminated waste disposal site
in Russia. |
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Keywords: | Mapping Geostatistics Sampling size Interpolation Environment |
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