This table lists the various P indicator, P1, P2 value combinations that can be used to specify a time range.
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This table lists the various P indicator, P1, P2 value combinations that can be used to specify a time range.
They values closely correspond to how a time range is specified in the GRIB file format.
- 0 Average
- 1 Accumulation
- 2 Maximum
- 3 Minimum
- 4 Difference (value at the end of the time range minus value at the beginning)
- 5 Root Mean Square
- 6 Standard Deviation
- 7 Covariance (temporal variance)
- 8 Difference (value at the beginning of the time range minus value at the end)
- 9 Ratio
- 51 Climatological Mean Value
- 10-191 Reserved
- 192-254 Reserved for Local Use
- 200 Vectorial mean
- 201 Mode
- 202 Standard deviation vectorial mean
- 203 Vectorial maximum
- 204 Vectorial minimum
- 205 Product with a valid time ranging inside the given period
- 254 Istantaneous value Notes about the time range values:
- For instantaneous values: the date and time in DB-All.e are the validity date and time of a value; P1 and P2 are 0.
- For statistically processed values (for example average, accumulation, extreme values): the date and time in DB-All.e are the date and time of end of the time interval.
- P1 is defined as the difference in seconds between the time in DB-All.e ( validity date and time or end of the time interval ) and the reference time. It can be negative only when the time in DB-All.e is earlier than the reference time. In other words, Note that, for observed values, the reference time is the same as the time in DB-All.e, therefore for observed values P1 is always zero.
- P2 is defined as the duration of the period over which statistical processing, and is always positive. Note that, for non statistical values, P2 is always zero.