GRIB2 - PRODUCT DEFINITION TEMPLATE 4.10

Percentile forecasts at a horizontal level or in a horizontal
layer in a continuous or non-continuous time interval

Created 09/21/2007

Preliminary note: This template was not validated at the time of publication and should be used with caution. Please report any use to the WMO Secretariat (World Weather Watch-Basic Systems Department) to assist for validaton.


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 data cutoff (see Note 1)
17
Minutes after reference time data cutoff
18
Indicator of unit of time range (see Code Table 4.4)
19-22
Forecast time in units defined by previous octet (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
Percentile value (from 100% to 0%)
36-37
Year of end of overall time interval
38
Month of end of overall time interval
39
Day of end of overall time overall time interval
40
Hour of end of overall time interval
41
Minute of end overall time interval
42
Second of end of overall time interval
43
n ― number of time range specifications describing the time intervals used to calculate the statistically-processed field
44-47
Total number of data values missing in the statistical process
48-59 Specification of the outermost (or only) time range over which statistical processing is done
48
Statistical process used to calculate the processed field from the field at each time increment during the time range
(see Code Table 4.10)
49 Type of time increment between successive fields used in the statistical processing (see Code Table 4.11)
50 Indicator of unit of time range over which statistical processing is done (see Code Table 4.4)
51-54
Length of the time range over which statistical processing is done, in units defined by the previous octet
55
Indicator of unit of time for the increment between the successive fields used (see Code Table 4.4)
56-59
Time increment between successive fields, in units defined by the previous octet (see Note 3)
60-nn These octets are included only if n>1, where nn = 47 +12 x n
60-71
As octets 48-59, next innermost step of processing
72-nn
Additional time range specifications, included in accordance with the value of n, Contents as octets 48 to 59, 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) 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.



Back