Section 4 - Code Table 15 : Type of spatial processing used to arrive at given data value from the source data
Code Tables for Section 4
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More Sections
Code | Meaning |
0 | Data is calculated directly from the source grid with no interpolation |
1 | Bilinear interpolation using the 4 source grid grid-point values surrounding the nominal grid-point |
2 | Bicubic interpolation using the 4 source grid grid-point values surrounding the nominal grid-point |
3 | Using the value from the source grid grid-point which is nearest to the nominal grid-point |
4 | Budget interpolation using the 4 source grid grid-point values surrounding the nominal grid-point |
5 | Spectral interpolation using the 4 source grid grid-point values surrounding the nominal grid-point |
6 | Neighbor-budget interpolation using the 4 source grid grid-point values surrounding the nominal grid-point |
255 | Missing |
( 1) This method assumes that each field really represents box averages/maxima/minima where each box extends halfway to its neighbouring grid point in each direction to represent averages/maxima/minima of values from the source grid with no interpolation.
( 2) Budget interpolation means a low-order interpolation method that quasi-conserves area averages. It would be appropriate for interpolating budget fields such as precipitation. This method assumes that the field really represents box averages/maxima/minima where each box extends halfway to its neighbouring grid point in each direction. The method actually averages bilinearly interpolated values in a square array of points distributed within each output grid box.
( 3) Performs a budget interpolation at the grid point nearest to the nominal grid point.