| Octet No. | Contents |
|---|---|
| 12-15 | Reference value (R) (IEEE 32-bit floating-point value) |
| 16-17 | Binary scale factor (E) |
| 18-19 | Decimal scale factor (D) |
| 20 | Number of bits used for each packed value (field width) |
| 21-24 | P― Laplacian scaling factor (expressed in 10-6 units) |
| 25-26 |
Js ― pentagonal resolution parameter of the unpacked subset (see Note1) |
| 27-28 |
Ks ― pentagonal resolution parameter of the unpacked subset (see Note1) |
|
29-30 |
Ms ― pentagonal resolution parameter of the unpacked subset (see Note1) |
| 31-34 |
Ts ― total number of values in the unpacked subset (see Note1) |
| 35 |
Precision of the unpacked subset
(see Code Table 5.7) |
| Notes: (1) The unpacked subset is a set of values defined in the same way as the full set of values (on a spectrum limited to Js, Ks and Ms ), but on which scaling and packing are not applied. Associated values are stored in octets 6 onwards of section 7. (2) The remaining coefficients are multiplied by (n x (n+1))p , scaled and packed. The operator associated with this multiplication is derived from the Laplacian operator on the sphere. (3) The retrieval formula for a coefficient of wave number n is then: Y = (R+X x 2e ) x 10-d x (n x(n+1))-p where X is the packed scaled value associated with the coefficient. |