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• Point A is equal to the distance PB divided by the length of AB. (Weighting  = W_A).
• Point B is equal to the distance AP divided by the length of AB. (Weighting  = W_B).
• The value at Point P is then the sum of these two contributions: i.e. P = (A x A_W) + (B x B_W)

Examples of the interpolation technique can be seen in the section dealing with selection of grid points for meteograms, at Fig 8.1.5.6B.

_{Amended/Updated 24/03/21 - Minor amends}