Time range values

This table lists the various P indicator, P1, P2 value combinations that can be used to specify a time range. More...

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.