GRIB2 - PRODUCT DEFINITION TEMPLATE 4.61

Individual ensemble reforecast, control and perturbed, at a horizontal
level or in a horizontal layer in a continuous or non-continuous time interval

Created 07/02/2014


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 centre)
14
 Forecast generating process identifier (see Code ON388 Table A)
15-16
 Hours after reference time of data cut-off (see Note 1)
17
 Minutes after reference time of data cut-off
18
 Indicator of unit of time range (see Code Table 4.4)
19-22
 Forecast time in units defined by octet 18 (see Note 2)
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
 Type of ensemble forecast (see Code Table 4.6)
36 Perturbation number
37 Number of forecasts in ensemble
38-39 Year of model version date (See Note 3)
40 Month of model version date
41 Day of model version date
42 Hour of model version date
43 Minute of model version date
44 Second of model version date
45-46 Year of end of overall time interval
47 Month of end of overall time interval
48 Day of end of overall time interval
49 Hour of end of overall time interval
50 Minute of end overall time interval
51 Second of end of overall time interval
52
 n ― number of time range specifications describing the time intervals used to calculate the statistically-processed field
53-56 Total number of data values missing in the statistical process
57-58 Specification of the outermost (or only) time range over which statistical processing is done
57
 Statistical process used to calculate the processed field from the field at each time increment during the time range
(see Code Table 4.10)
58 Type of time increment between successive fields used in the statistical processing (see Code Table 4.11)
59 Indicator of unit of time range over which statistical processing is done (see Code Table 4.4)
60-63
 Length of the time range over which statistical processing is done, in units defined by the previous octet
64 Indicator of unit of time for the increment between the successive fields used (see Code Table 4.4)
65-68 Time increment between successive fields, in units defined by the previous octet (see Notes 4 and 5)
69-nn These octets are included only if n>1, where nn = 56 +12 x n
69-80
 As octets 57 to 68, next innermost step of processing
81-nn
 Additional time range specifications, included in accordance with the value of n, Contents as octets 57 to 68, repeated as necessary.


Notes:

(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) This is the date when the reforecast is produced with a particular version of the model.

(4) 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 processes are The temperatures measured by analogue maximum and minimum thermometers or thermographs and the rainfall measured by a raingauge.

(5) 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 51,63,75...). 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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