Interpolation of unevenly spaced data using a parabolic leapfrog correction method and cubic splines

Abstract

The technique proposed allows interpolation of data recorded at unevenly spaced sites to a regular grid or to other sites. Known data are interpolated to an initial guess field grid of unevenly spaced rows and columns by a simple distance weighting procedure. The initial guess field is then adjusted by using a parabolic leapfrog correction and the known data. The final output is then generated by use of cubic spline interpolation on the adjusted grid. Application to test and actual data showed acceptably low root-mean-square error.

Citation

Guardado, Julio L.; Sommers, William T. 1977. Interpolation of unevenly spaced data using a parabolic leapfrog correction method and cubic splines. Res. Note PSW-RN-324. Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 5 p