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FYI, mathematically if a function satisfies Laplace's equation: del-squared F = 0, then its maxima and minima must lie on the boundary of its domain and nowhere else. It is like a rubber sheet stretched over a drumhead with highs and lows on the rim of the drumhead. The rubber sheet will conform to the boundary and values out in the domain will be an average of (and always less extreme than) those on the edge. So if the Ferret Laplacian gridding is working correctly, this property must hold (within numerical rounding error and loss of significant figures). ------------------------------------------------------------------------------------------ Edward D. (Ned) Cokelet, Ph.D. Oceanographer NOAA/PMEL off: (206) 526-6820 7600 Sand Point Way NE fax: (206) 526-6485 Seattle, WA 98115-6349 The contents of this message are mine personally and do not necessarily reflect any position of the Government or the National Oceanic and Atmospheric Administration. |