GRIB2 - PRODUCT DEFINITION TEMPLATE 4.63

Individual ensemble forecast, control and perturbed,
at a horizontal level or in a horizontal layer in a continuous or
non-continuous time interval for spatio-temporal changing tiles

Created 05/22/2019


Octet No. Contents
10
 Parameter category (see Code table 4.1)
11 Parameter number (see Code table 4.2)
12 Tile classification (see Code table 4.242)
13 Total number (NT) of tile/attribute pairs (see Notes 1 and 2)
14 Number of used spatial tiles (NUT) (see Notes 1 and 2)
15 Tile index (ITN={1,...,NUT}) (see Note 1)
16 Number of used tile attributes (NAT) for tile ITN (see Note 1)
17 Attribute of tile (see Code table 4.241) (A={A(1),...,A(NAT(ITN))}) (see Note 1)
18 Type of generating process (see Code table 4.3)
19 Background generating process identifier (defined by originating centre)
20 Analysis or forecast generating process identifier (see Code ON388 Table A)
21-22 Hours of observational data cutoff after reference time (see Note 3)
23 Minutes of observational data cutoff after reference
24 Indicator of unit of time range (see Code table 4.4)
25-28 Forecast time in units defined by octet 24 (see Note 4)
29 Type of first fixed surface (see Code table 4.5)
30 Scale factor of first fixed surface
31-34 Scaled value of first fixed surface
35 Type of second fixed surfaced (see Code table 4.5)
36 Scale factor of second fixed surface
37-40 Scaled value of second fixed surfaces
41 Type of ensemble forecast (see Code Table 4.6)
42 Perturbation number
43 Number of forecasts in ensemble
44-45 Year of end of overall time interval
46 Month of end of overall time interval
47 Day of end of overall time interval
48 Hour of end of overall time interval
49 Minute of end overall time interval
50 Second of end of overall time interval
51 n ― number of time ranges specifications describing the time intervals used to calculate the statistically-processed field
52-55 Total number of data values missing in the statistical process
56 - 67 Specification of the outermost (or only) time range over which statistical processing is done
56 Statistical process used to calculate the processed field from the field at each time increment during the time range (see Code Table 4.10)
57 Type of time increment between successive fields used in the statistical processing (see Code Table 4.11)
58 Indicator of unit of time range over which statistical processing is done (see Code Table 4.4)
59-62 Length of the time range over which statistical processing is done, in units defined by the previous octet
63 Indicator of unit of time for the increment between the successive fields used (see Code Table 4.4)
64-67 Time increment between successive fields, in units defined by the previous octet (see Notes 5 and 6)
68 - nn These octets are included only if n>1, where nn = 55 + 12 x n
68-79 As octets 56 to 67, next innermost step of processing
80-nn Additional time range specifications, included in accordance with the value of n, Contents as octets 50 to 61, repeated as necessary.


Notes:

(1) See Note 1 under product definition template 4.55.

(2) For more information, see Part B, GRIB Attachment IV.

(3) Hours greater than 65534 will be coded as 65534.

(4) The reference time in section 1 and the forecast time together define the beginning of the overall time interval.

(5) An increment of zero means that the statistical processing the result of continuous (or near continuous) process, not the processing of a number of discrete samples. Examples of such continuous process are the temperatures measured by analogue maximum and minimum thermometers or thermographs and the rainfall measured by a rain gauge.

(6) 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 57, 69, 81,...). For all but the innermost (last) time range, the next inner range is then processed using these reference and forecast times as the initial reference and forecast times.


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