[Note that the question and the answer below are recreated from a HYSPLIT FAQ site that predates this forum site. The original posting date is unknown.]
Interpolation depends upon the gradient relative to the size of the concentration grid. If it is strong and there are only a few cells between contours then there won’t be much spatial error in the interpolation. If the gradients are weak and there are many cells between contours the spatial error can be large.
Roland Draxler
Is it possible to interpolate between two lines of equal concentration or between a maximum and a line?
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