Polynomial Fitting Method
q We can use a polynomial function to fit the observational data and then
use this function to generate data on regular grids.
q In meteorological applications, up to thrid order polynomial have been
used. But usually, quadratic equation is sufficient for most purpose:
q The problem now it to determine the values of the coefficients: a1,
a2, …., and a6.
q If we have 6 observations of h, then we can determine the 6
coefficients in the quadratic polynomial function.
q We can then use the polynomial function for gridding purpose.