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• delivers a value for an off-grid location (red point), for output purposes, by using model values at the grid vertices (black points).

Fig3Fig33.3.1A: The Reduced Gaussian grid is triangular in nature.  The interpolation uses the three corner points (black points) closest to the selected location (red point) and takes a weighted average based upon the proximity of the point to the to vertices to arrive at the interpolated value.  

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A special case then arises when Point P lies on the line directly between two points. (see Fig3Fig33.3.2B).

Fig3Fig33.3.2B: 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 points (black points) each side of selected location (red point) to arrive at the interpolated value.

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