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Fig3.3-2: Sometimes a point lies directly between two grid points. The interpolation then takes a weighted average based upon the ratio of distances from the two end uses the two points (black points) each side of selected location (red point) to .  It then takes a weighted average based upon the ratio of distances from the two end points to arrive at the interpolated value.

The A value for point P is derived using a weighting factor apportioned to for each end point is by linear interpolation.  Therefore the . The weighting for:

• 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)

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