Spectral Synthesis on Rotated and Regular Grids

Peter Lynch and Ray McGrath

Irish Meteorological Service, Dublin

HIRLAM Technical Report No. 06

December, 1990


An efficient subroutine (SYNTHR) has been coded which synthesises grid-point values from spectral coefficients. It is of high accuracy and is considerably faster than routines currently in use.

Synthesis on a rotated grid is performed by first transforming the spectral coefficients using subroutine JACOBI and then calling SYNTHR. The overhead for the rotated grid is about 67%.

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