GRIB2 - PRODUCT DEFINITION TEMPLATE 4.106

Anomalies, significance and other derived products from an individual ensemble forecast, control and perturbed in
relation to a reference period at a horizontal level or in a horizontal layer in a continuous or non-continuous time interval

Created 08/31/2023


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 center)
14
Analysis or forecast generating process identifier (defined by originating center)
15-16
Hours of observational data cut-off after reference time (see Note 1)
17
Minutes of observational data cut-off after reference time
18
Indicator of unit of time range (see Code Table 4.4)
19-22
Forecast time in units defined by previous octet
23
Type of first fixed surface (see Code Table 4.5)
24
Scale factor of first fixed surface
25-28
Scaled value of first fixed surface
29
Type of second fixed surface (see Code Table 4.5)
30
Scale factor of second fixed surface
31-34
Scaled value of second fixed surface
35-36
Year of end of overall time interval
37
Month of end of overall time interval
38
Day of end of overall time interval
39
Hour of end of overall time interval
40
Minute of end of overall time interval
41
Second of end of overall time interval
42
Number of time range (NT)
43-46
Number of missing in statistical process

The next six entries are repeated NT times nt=1:NT
47 + (nt-1)*12
Type of statistical processing
48 + (nt-1)*12
Type of time increment
49 + (nt-1)*12
Indicator of unit for time range
50 + (nt-1)*12 - 53 + (nt-1)*12
Length of time range
54 + (nt-1)*12
Indicator of unit for time increment (see Code Table 4.4)
55 + (nt-1)*12 - 58 + (nt-1)*12
Time increment

End of sequence repeated NT times
59 + (NT-1)*12
Type of ensemble forecsat (see Code Table 4.6)
60 + (NT-1)*12
Purturbation Number
61 + (NT-1)*12
Number of ensemble forecasts
62 + (NT-1)*12
Type of reference dataset (see Code Table 4.100)
63 + (NT-1)*12
Type of relation to reference dataset (see Code Table 4.101)
64 + (NT-1)*12
Number of additional parameter for reference period - NA (see Note 2)

The next two entries are repeated NA times na=0:NA - can be 0 times if no parameters are necessary
65 + (NT-1)*12 + (na-1)*5
Scale factor of additional parameter for reference period
66 + (NT-1)*12 + (na-1)*5 - 69 + (NT-1)*12 + (na-1)*5
Scaled value of additional parameter for reference period

End of repeated NA sequence
65 + (NT-1)*12 + NA*5 - 66 + (NT-1)*12 + NA*5
Year of start of reference period
67 + (NT-1)*12 + NA*5
Month of start of reference period
68 + (NT-1)*12 + NA*5
Day of start of reference period
69 + (NT-1)*12 + NA*5
Hour of start of reference period
70 + (NT-1)*12 + NA*5
Minute of start of reference period
71 + (NT-1)*12 + NA*5
Second of start of reference period
72 + (NT-1)*12 + NA*5 - 75+ (NT-1)*12 + NA*5
Sample size of reference period
76 + (NT-1)*12 + NA*5
Number of reference period time range - NR (see Note 3)

The next three entries are repeated NR times nr=1:NR
77 + (NT-1)*12 + NA*5 + (nr-1)*6
Type of statistical processing for time range for reference period (see Code Table 4.102)
78 + (NT-1)*12 + NA*5 + (nr-1)*6
Indicator of unit of time range for reference period (see Code Table 4.4)
79 + (NT-1)*12 + NA*5 + (nr-1)*6 - 82 + (NT-1)*12 + NA*5 + (nr-1)*6
Length of time range for reference period

end of repeated NR sequence


Notes:

(1) Hours greater than 65534 will be coded as 65534

(2) See notes under Code table 4.101 for details

(3) Number of reference period time range' is used to define an outer and, if needed, one or more inner loops. The outer loop gives the
overall date and time range of the reference period and the inner loop(s) are used to specify a sub-period over all time instances
defined in the outer loop in terms of the time unit defined by "Reference period indicator of unit for time increment". Typically
the outer loop defines a number of years and inner loop defines the date and time range within each year: for instance 'every January for 30 years'



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