This example represents a daily average valid on 2 January 2012 of a field produced by a real-time forecast started on 20120101 00Z. In this example, where the field is produced 6-hourly, the daily average valid on 20120102 is the average of steps 24, 30, 36 and 42.
- 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 ( daily average ) | |||||||||
---|---|---|---|---|---|---|---|---|---|
Start of forecast ( section 1 ) | |||||||||
Octets reforecast | Octets real time | values | meaning of values | 12Grib_api keys | |||||
12 | Significance of Reference Time | 1 | Start of forecast13-14 | ||||||
13-14 | Year (four digits) | 2012 | year of start of forecast15 | dataDate=20120101 dataTime=0 | |||||
15 | Month | 01 | month of start of forecast | ||||||
16 | 16 | Day | 01 | day of start of forecast | |||||
17 | 17 | Hour | 00 | hour of start of forecast | |||||
Daily average ( section 4 ) | 18e.g. template 4.11 ) | ||||||||
18 | Indicator of unit of time range | 1 | Hour | 19-22||||||
19-22 | Forecast time | 24 | Start of forecast + forecast time = start of average period | 45-46startStep=24 | |||||
38-39 | year of end of overall time interval | 2012 |
End of average period | 47
endStep=-48 | |||||
40 | month of end of overall time interval | 01 | 48|||||||
41 | day of end of overall time interval | 03 | |||||||
49 | 42 | hour of end of overall time interval | 00 | 52||||||
45 | number of time ranges | 1 | Only one time statistics applied (average) | 53-56||||||
46-49 | total number of data values missing in statistical process | 0 | 57 | ||||||
50 | Statistical process used to calculate the processed field from the field at each time increment during the time range | 0 | Average | 58stepType=avg | |||||
51 | 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||||||
52 | Indicator of unit of time for time range over which statistical processing is done | 11 | 6-hourly | 60-63indicatorOfUnitForTimeRange=11 | |||||
53-56 | Length of the time range over which statistical processing is done, in units defined by the previous octet | 4 | Daily average | 64lengthOfTimeRange=4 | |||||
57 | Indicator of unit of time for the increment between the successive fields used | 11 | 6-hourly | 65-68indicatorOfUnitForTimeIncrement=11 | |||||
58-61 | Time increment between successive fields, in units defined by the previous octet | 1 | Time frequency used to compute the daily mean In the example, 1 means that 6-hourly outputs have been used to compute the average | timeIncrement=1 |
Examples of GRIB2 headers: