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NEW METHOD OF INTERPOLATION 1. Horizontal-distance and direction influences (based on modified Shepard’ interpolator) Additional topographic influences on interpolated precipitation (from elevat pe, slope orientation and the degree of exposure to orography mportant: the orographic scale Orographic elevation Longitudinal and latitudinal components of the slope of the orographic regio Potential exposure of station “i” to orography can estimate an interpolation bias for each station (when topographic influe not taken into account): from nearby stations Pi ˆ j P i z dz dx ( dz dy ˆ Δ [,( ),( ), ] P i i i i i P P P fz dz dx dz dy E Then we can estimate Δ j P ˆ ˆ Δ j j j P P P And finally: ˆ ( ) P i i E fz z
