Figure 12
From: A study of spatial resolution in pollution exposure modelling
Interpolation of the value at point P (xp, yp) (greydot) by a succession of polynomial interpolations. First, the values at points (yi, xp) (i = 1,2,3,4) (white dots) are interpolated (in the x-direction) using Eq. 2. These new values are then used as input to interpolate in the y-direction to determine the value at the point P (xp, yp).