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The first two maps show the original data sources. The 3 arc-second data is noticeably coarser. The following sequence shows a series of realizations. Each of these was generated by adding a random field with mean and variance and spatial autocorrelation matching that of the sampled 7.5" elevation data.
The perturbations have added "texture" to the 3 arc-second data. This texture fails to completely resolve the north-south running canyons, since, aside from incorporating knowledge about the genereal decay of correlation with distance, the random fields do not account for specific terrain variation due to geomorphic processes. The expectation is that these random fluctuations will resolve, given a sufficient number of simulation runs, into distributions that reflect the terrain as depicted by the 7.5" data.
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Page created by Ashton Shortridge
Last modified on April 10, 1996
