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Inverse Distance Squared
Data from 2007.05.31 to 2007.12.31. For every observed value of 24 hour precipitation at a station a model value is calulated at the same point performing an inverse distance squared weighted interpolation over the nearest neighbours.
Interpolated_Value = SUM[Neighbour_Value/(D*D)] / SUM[ 1/(D*D)]
D : The distance between the modeled point and the neighbour station. The sum is performed over only the neighbours lieing within 50 km of the model point.
The graph below depicts the interpolated value at the model point against the actual observed value at that station.
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The same algorithm is applied below but with all neighbours within 100 km distance.
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