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  valuesGrib_api keys
12Significance of Reference Time1Start of forecast 
13-14Year (four digits)2012year of start of forecast

 

dataDate=20120101

dataTime=0

15Month 01month of start of forecast
16Day 01day of start of forecast
17Hour 00hour of start of forecast
Minimum ( section 4 e.g. Template 4.11)
18Indicator of unit of time range 1Hour 
19-22Forecast time 42Step at the beginning of the 6-hourly intervalstartStep=42
45-46year of end of overall time interval 2012

 

End of minimum period

 

endStep=48

47month of end of overall time interval 01
48day of end of overall time interval 03
49hour of end of overall time interval 00
52number of time ranges 1Only one time statistics applied (minimum) 
53-56total 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

 3MinimumstepType=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

 1HourindicatorOfUnitForTimeRange=1
60-63

Length of the time range over which statistical

processing is done, in units defined by the previous octet

 66-hourly minimumlengthOfTimeRange=6
64

Indicator of unit of time for the increment between

the successive fields used

 1HourindicatorOfUnitForTimeIncrement=1
65-68

Time increment between successive fields,

in units defined by the previous octet

 0Minimum computed continuously in the 6 hourly intervaltimeIncrement=0 

 

Examples of grib2 headers: