GRIB2 - PRODUCT DEFINITION TEMPLATE 4.34

Individual Ensemble Forecast, control and perturbed, at a
horizontal level or in a horizontal layer, in a continuous or
non-continuous interval for simulated (synthetic) satellite data

Created 07/11/2013


Octet No. Contents
10
Parameter category (see Code Table 4.1)
11
Parameter number (see Code Table 4.2)
12
Type of generating process (see Code Table 4.3)
13
Background generating process identifier (defined by originating centres)
14
Analysis or forecast generating process identified
15-16
Hours of observational data cut-off after reference time (see Note 2)
17
Minutes of observational data cut-off after reference time (see Note 2)
18
Indicator of unit of time range (see Code Table 4.4)
19-20
Forecast time in units defined by octet 18
23
Number of contributing spectral bands (NB)


24 - Repeat the following 11 octets for each contributing band (nb = 1,NB)

(24+11(nb-1)) - (25+11(nb-1)) Satellite series of band nb (code table defined by originating/generating centre)
(26+11(nb-1)) - (27+11(nb-1)) Satellite number of band nb (code table defined by originating/generating centre)
(28+11(nb-1)) - (29+11(nb-1)) Instrument types of band nb (code table defined by originating/generating centre)
(30 +11(nb-1))                      Scale factor of central wave number of band nb
(31+11(nb-1)) - (34+11(nb-1)) Scaled value of central wave number of band nb (units: m-1)
(24+11NB)                           Type of ensemble forecast (see Code Table 4.6)
(25+11NB)                           Perturbation number
(26+11NB)                           Number of forecast in ensemble
(27+11NB) - (28+11NB)         Year of end of overall time interval
(29+11NB)                           Month of end of overall time interval
(30+11NB)                           Day of end of overall time interval
(31+11NB)                           Hour of end of overall time interval
(32+11NB)                           Minute of end of overall time interval
(33+11NB)                           Second of end of overall time interval
(34+11NB)                           n - number of time range specifications describing
                                          the time interval used to calculate the statistically processed field
(35+11NB) - (38+11NB)        Total number of data values missing in statistical process

(39+11NB) - Repeat the following 12 octets for each time range specification (i=1,n)

(39+11NB+12(i-1))               Statistical process used to calculate the processed field
                                          from the field at each time increment during the time range (see Code Table 4.10)
(40+11NB+12(i-1))               Type of time increment between succssive fields used in the statisticall
                                          processing (see Code Table 4.11)
(41+11NB+12(i-1))               Indicator unit of time for time range over which statisticall processing is done (see Code Table 4.4)
(42+11NB+12(i-1)) - (45+11NB+12(i-1))   Length of the time range over which statisticall processing
                                          is done, in unit defined by the previous octet
(46+11NB+12(i-1))               Indicator unit of time for the increment between the successive fields
                                         used (see Code Table 4.4)
(47+11NB+12(i-1)) - (50+11NB+12(i-1))   Time increment between successive field,
                                         in units defined by the previous octet (see Notes 3 and 4)

Note :
1.   Hours greater than 65534 will be coded as 65534
2.   The reference time in section 1 and the forecast time together define the beginning of the overall time interval.
3.   An increment of zero means that the statistical proceeing is the result of a continuous (or near continuous) process, not the processing of a number of discrete samples. Example of such continuous processes are the temperatures measured by analogue maximum and minimum thermometers or thermographs and the rainfall measured by a rain gauge.
4.   The reference and forecast times are successively set to their initial values plus or minus the increment, as defined by the type of time increment (one of octets 51, 62, 73, ...). For all but the innermost (last) time range, the next inner range is then processed using these reference and forecast times as the inital reference and forecast time.


Back