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| q |
Observations are often available only at a few stations
that
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are unevenly spaced in the domain of interests.
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| q |
In order to compute derivatives of the field variables, as
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would be required in diagnostic studies or in the
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initialization of a numerical model, or simply to
perform a
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sensible averaging process, one often requires values of
the
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variables at points on a regular grid.
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| q |
Assigning the best values at the grid points, given data at
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arbitrarily located stations and perhaps a first guess at
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regular grid points, is what has traditionally been called
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objective analysis.
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