This example represents a 6-hour minimum of a field valid on 20120103 00Z produced by a forecast started on 20120101 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 4.11) | ||||
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 |
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: