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3 techniques:
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Geostrophic relocation
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Use estimate of velocity field to
relocate observations
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to common time.
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Iterative procedure.
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Interpolation
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Interpolate between two or more spatial
surveys to
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create spatial coverage at a given time.
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Spatio-temporal correlation method
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As the 2nd technique but
weighted according time
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between observation and required common
time.
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