GRIB2 - PRODUCT DEFINITION TEMPLATE 4.123

Probability forecasts from large ensembles with spatiotemporal processing
based on focal (moving window) statistics in relation to a reference period
at a horizontal level or in a horizontal layer in a continuous or non-continuous time interval

Created 07/15/2024


Octet No. Contents
10
Parameter category (see Code table 4.1)
11
Parameter number (see Code table 4.2)
12
Type of generating process (seeCode table 4.3)
13
Background generating process identifier (defined by originating centre)
14
Analysis or forecast generating process identifier (defined by originating centre)
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 octet 18
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 surfaced (see Code table 4.5)
30
Scale factor of second fixed surface
31-34
Scaled value of second fixed surfaces
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

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 rane
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 forecast (see Code table 4.6)
(60+(NT-1)*12)-(63+(NT-1)*12)
Number of forecasts in ensemble
64+(NT-1)*12
Forecast probability number
65+(NT-1)*12
Total number of forecast probabilities
66+(NT-1)*12
Probability type (see Code table 4.9)
67+(NT-1)*12
Scale factor of lower limit
(68+(NT-1)*12)-(71+(NT-1)*12)
Scaled value of lower limit
72+(NT-1)*12
Scale factor of lower limit
(73+(NT-1)*12)-(76+(NT-1)*12)
Scaled value of lower limit
77+(NT-1)*12
Type of reference dataset (see Code table 4.100)
78+(NT-1)*12
Type of relation to reference dataset (see Code table 4.101)
79+(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
80+(NT-1)*12+(na-1)*5
Scale factor of additional parameter for reference period
(81+(NT-1)*12+(na-1)*5)-(84+(NT-1)*12+(na-1)*5)
Scaled value of additional parameter for reference period

End of repeated NA sequence
(80+(NT-1)*12+NA*5)-(81+(NT-1)*12+NA*5)
Year of start of reference period
82+(NT-1)*12+NA*5
Month of start of reference period
83+(NT-1)*12+NA*5
Day of start of reference period
82+(NT-1)*12+NA*5
Hour of start of reference period
82+(NT-1)*12+NA*5
Minute of start of reference period
82+(NT-1)*12+NA*5
Second of start of reference period
(87+(NT-1)*12+NA*5)-(90+ (NT-1)*12+NA*5)
Sample size of reference period
91+(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
92+(NT-1)*12+NA*5+(nr-1)*6
Type of statistical processing for time range for reference period (see Code table 4.102)
93+(NT-1)*12+NA*5+(nr-1)*6
Indicator of unit of time range for reference period (see Code table 4.4)
(94+(NT-1)*12+NA*5+(nr-1)*6)-(97+(NT-1)*12+NA*5+(nr-1)*6)
Length of time range for reference period

End of repeated NR sequence
98+(NT-1)*12+NA*5+(nr-1)*6
Spatial vicinity type (see Code table 4.103)
99+(NT-1)*12+NA*5+(nr-1)*6
Number of spatial vicinity values (NSV)

The next entry repeats nsv=1:NSV times
(100+(nsv-1)*4+(NT-1)*12+NA*5+(nr-1)*6)-(103+(nsv-1)*4+(NT-1)*12+NA*5+(nr-1)*6)
Spatial vicinity value
104+(nsv-1)*4+(NT-1)*12+NA*5+(nr-1)*6
Spatial vicinity processing (see Code table 4.104)
(105+(nsv-1)*4+(NT-1)*12+NA*5+(nr-1)*6)-(106+(nsv-1)*4+(NT-1)*12+NA*5+(nr-1)*6)
Spatial vicinity processing argument 1 (e.g., if previous is quantile)
(107+(nsv-1)*4+(NT-1)*12+NA*5+(nr-1)*6)-(108+(nsv-1)*4+(NT-1)*12+NA*5+(nr-1)*6)
Spatial vicinity processing argument 2 (e.g., if previous is quantile)
109+(nsv-1)*4+(NT-1)*12+NA*5+(nr-1)*6
Spatial vicinity missing data (see Code table 4.105)
110+(nsv-1)*4+(NT-1)*12+NA*5+(nr-1)*6
Temporal vicinity processing (see Code table 4.104)
111+(nsv-1)*4+(NT-1)*12+NA*5+(nr-1)*6
Temporal vicinity unit (see Code table 4.4)
(112+(nsv-1)*4+(NT-1)*12+NA*5+(nr-1)*6)-(115+(nsv-1)*4+(NT-1)*12+NA*5+(nr-1)*6)
Temporal vicinity towards past
(116+(nsv-1)*4+(NT-1)*12+NA*5+(nr-1)*6)-(119+(nsv-1)*4+(NT-1)*12+NA*5+(nr-1)*6)
Temporal vicinity towards future


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) 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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