eccodes/definitions/grib2/tables/12/4.15.table

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# Code table 4.15 - Type of spatial processing used to arrive at given data value from the source data
0 0 Data is calculated directly from the source grid with no interpolation
1 1 Bilinear interpolation using the 4 source grid grid-point values surrounding the nominal grid-point
2 2 Bicubic interpolation using the 4 source grid grid-point values surrounding the nominal grid-point
3 3 Using the value from the source grid grid-point which is nearest to the nominal grid-point
4 4 Budget interpolation using the 4 source grid grid-point values surrounding the nominal grid-point
5 5 Spectral interpolation using the 4 source grid grid-point values surrounding the nominal grid-point
6 6 Neighbor-budget interpolation using the 4 source grid grid-point values surrounding the nominal grid-point
255 255 Missing