#GRIBv2 - Table 4.15 Type of spatial processing used to arrive at a 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
#7-191:Reserved
#192-254:Reserved for Local Use
255:255:Missing
