This example represents a 6-hour minimum of a field valid on 20120103 00Z produced by a re-forecast started on 20120101 00Z with the model version which is operational at 20130101 00Z . In this example, the minimum is the 6-hourly minimum in the time interval: steps 42 to 48.
- In bold, the values are fixed. They are meant to be used by all partners
- In green, these are the values for the example.
| Time (Minimum over the last 6 hours ) | ||||
|---|---|---|---|---|
| Start of re-forecast ( section 1 ) | ||||
Octets | Fixed | Meaning of values | Grib_api keys | |
| 12 | Significance of Reference Time | 1 | Start of forecast | |
| 13-14 | Year (four digits) | 2012 | year of start of forecast |
dataDate=20120101 dataTime=0 |
| 15 | Month | 01 | month of start of forecast | |
| 16 | Day | 01 | day of start of forecast | |
| 17 | Hour | 00 | hour of start of forecast | |
| Minimum ( section 4 e.g. template 4.61) | ||||
| 18 | Indicator of unit of time range | 1 | Hour | |
| 19-22 | Forecast time | 42 | Step at the beginning of the 6-hourly interval | startStep=42 |
| 38-39 | Year of Model Version | 2013 |
When the forecast is run == when the version of the forecast used was operational |
modelVersionDate=20130101 modelVersionTime=0 |
| 40 | Month of Model Version | 01 | ||
| 41 | Day of Model Version | 01 | ||
| 42 | Hour of Model Version | 00 | ||
| 43 | Minute of Model Version | 00 | ||
| 44 | Second of Model Version | 00 | ||
| 45-46 | year of end of overall time interval | 2012 |
End of minimum period |
endStep=48 |
| 47 | month of end of overall time interval | 01 | ||
| 48 | day of end of overall time interval | 03 | ||
| 49 | hour of end of overall time interval | 00 | ||
| 52 | number of time ranges | 1 | Only one time statistics applied (minimum) | |
| 53-56 | total number of data values missing in statistical process | 0 | ||
| 57 | Statistical process used to calculate the processed field from the field at each time increment during the time range | 3 | Minimum | stepType=min |
| 58 | Type of time increment between successive fields used in the statistical processing | 2 | Successive times processed have same start time of forecast, forecast time is incremented | |
| 59 | Indicator of unit of time for time range over which statistical processing is done | 1 | Hour | indicatorOfUnitForTimeRange=1 |
| 60-63 | Length of the time range over which statistical processing is done, in units defined by the previous octet | 6 | 6-hourly minimum | lengthOfTimeRange=6 |
| 64 | Indicator of unit of time for the increment between the successive fields used | 1 | Hour | indicatorOfUnitForTimeIncrement=1 |
| 65-68 | Time increment between successive fields, in units defined by the previous octet | 0 | Minimum computed continuously in the 6 hourly interval | timeIncrement=0 |
Examples of grib2 headers: