ECMWF plans some changes to the FM 92 - GRIB
Edition 2 coding of its Seasonal Forecast products on the GTS on 1 February
2008. A description of these products with a complete list of GTS bulletin
headers can be found at:
http://www.ecmwf.int/products/additional/gts_headers_seasonal.html .
The changes are summarised below:
|
Sec |
octet |
old value |
new value |
|
|
1 |
10 |
gribMasterTablesVersionNumber |
2 |
4 |
|
3 |
16 |
scaleFactorOfRadiusOfSphericalEarth |
1 |
MISSING |
|
3 |
17-20 |
scaledValueOfRadiusOfSphericalEarth |
6371229 |
MISSING |
|
3 |
43-46 |
subdivisionsOfBasicAngle |
0 |
MISSING |
|
4 |
15-16 |
hoursAfterReferenceTimeOfDataCutoff |
2208 |
0 |
|
4 |
18 |
indicatorOfUnitOfTimeRange |
13 |
3 |
|
4 |
19-22 |
forecastTime |
7948800 |
2 |
|
4 |
51 |
typeOfTimeIncrement |
1 |
3 |
|
4 |
52 |
indicatorOfUnitForTimeRange |
1 |
3 |
|
4 |
53-56 |
lengthOfTimeRange |
2208 |
1 |
|
5 |
10-11 |
dataRepresentationTemplateNumber |
0 |
40 |
|
5 |
22 |
typeOfCompressionUsed |
0 |
|
|
5 |
23 |
targetCompressionRatio |
255 |
for the control forecast we have also:
| Sec | octet | old value | new value | |
| 1 | 21 | typeOfProcessedData | 5 | 3 |
| 4 | 36 | perturbationNumber | 1 | 0 |
| Sec | octet | old value | new value | |
| 1 | 21 | typeOfProcessedData | 5 | 4 |
| 4 | 37 | numberOfForecastsInEnsemble | 40 | 41 |