Sampling schemes for digital soil survey - Home | NRCS schemes for digital soil survey Alex...
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Sampling schemes for digital soil survey
Alex McBratney
The University of SydneyAUSTRALIA
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• Random catena sampling• Latin hypercube sampling• Fuzzy k-means
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kth-order random toposequences
Seed pointUphill section
Downhill section
Odgers, N. P., McBratney, A. B., Minasny, B. Generation of kth-order random toposequences. Computers & Geosciences. (in press)
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Distance (m)
Elev
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n (m
)kth-order random toposequences
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kth-order random toposequences
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Latin Hypercube Sampling
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Probability X 2
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Latin Hypercube SamplingA random sampling procedure that
ensures a full coverage of the range of
each variable by maximally stratifying
the marginal distribution
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Cum. Probability Elevation
Cum. Probability Slop
e Latin Hypercube sampling
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• Ancillary information
• Latin hypercube sampling
• 300 soil profiles
Soil survey
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• Fuzzy k means stratification
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Monitoring in the Gulf CountrQueensland
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QLD DNR&W
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Fuzzy k-means ofThe environmental layersk = 50
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Siteses were constrained to be located within 1.5 km from roads
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• HELS useful for legacy data checking and new sampling
• Work needed on validation sampling