GRIB2 - PRODUCT DEFINITION TEMPLATE 4.46

Average, Accumulation, and/or Extreme values or Other statistically-processed
values at a horizontal level or in a horizontal layer in a continuous
or non-continuous time interval for aerosol

Created 12/06/2011


Octet No. Contents
10
Parameter category (see Code table 4.1)
11
Parameter number (see Code table 4.2)
12-13
Aerosol Type (see Code table 4.233)
14
Type of interval for first and second size (see Code table 4.91)
15
Scale factor of first size
16-19
Scale value of first size in meters
20
Scale factor of second size
21-24
Scale value of second size in meters
25
Type of generating process (see Code table 4.3)
26
Background generating process identifier (defined by originating centre)
27
Analysis or forecast generating process identifier (see Code ON388 Table A)
28-29
Hours after reference time of data cutoff (see Note 1)
30
Minutes after reference time of data cutoff (see Note 1)
31
Indicator of unit of time range (see Code table 4.4)
32-35
Forecast time in units defined by octet 31 (see Note 2)
36
Type of first fixed surface (see Code table 4.5)
37
Scale factor of first fixed surface
38-41
Scaled value of first fixed surface
42
Type of second fixed surfaced (see Code table 4.5)
43
Scale factor of second fixed surface
44-47
Scaled value of second fixed surfaces
48-49
Year of end of overall time interval
50
Month of end of overall time interval
51
Day of end of overall time interval
52
Hour of end of overall time interval
53
Minute of end overall time interval
54
Second of end of overall time interval
55
n ― number of time range specifications describing the time intervals used to calculate the statistically-processed field
56-59
Total number of data values missing in the statistical process
60-71 Specification of the outermost (or only) time range over which statistical processing is done
60
Statistical process used to calculate the processed field from the field at each time increment during the time range
(see Code Table 4.10)
61
Type of time increment between successive fields used in the statistical processing (see Code Table 4.11)
62
Indicator of unit of time range over which statistical processing is done (see Code Table 4.4)
63-66
Length of the time range over which statistical processing is done, in units defined by the previous octet
67
Indicator of unit of time for the increment between the successive fields used (see Code Table 4.4)
68-71
Time increment between successive fields, in units defined by the previous octet (see Note 3)
72-nn These octets are included only if n>1, where nn = 59 +12 x n
72-83
As octets 60 to 71, next innermost step of processing
84-nn
Additional time range specifications, included in accordance with the value of n, Contents as octets 50 to 61, 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 guage.

(4)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
precessed using these reference and forecast times as the initial reference and forecast time.


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