Octet | 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 |
Analysis or forecast generating
process identified (defined by originating centre) |
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 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 |
35-36 |
Year ― Time of end of
overall time interval |
37 |
Month ― Time of end of overall time interval |
38 |
Day ― Time of end of overall time interval |
39 |
Hour ― Time of end of overall time interval |
40 |
Minute ― Time of end of overall time interval |
41 |
Second ― Time of end of overall time interval |
42 |
n ― number of time ranges
specifications describing the time intervals used to calculate the
statistically-processed field |
43-46 |
Total number of data values
missing in statistical process 47-58 Specification of the outermost (or only) time range over which statistical processing is done |
47 |
Statistical process used to
calculate the processed field from the field at each time increment
during the time range (see Code table 4.10) |
48 |
Type of time increment between
successive fields used in the statistical processing (see Code table
4.11) |
49 |
Indicator of unit of time for
time range over which statistical processing is done (see Code table
4.4) |
50-53 |
Length of the time range over
which statistical processing is done, in units defined by the previous
octet |
54 |
Indicator of unit of time for
the increment between the successive fields used (see Code table 4.4) |
55-58 |
Time increment between
successive fields, in units defined by the previous octet (see Notes 3
and 4) 59-nn These octets are included only if n>1, where nn = 46 + 12 x n |
59-70 |
As octets 47 to 58, next
innermost step of processing |
71-nn |
Additional time range
specifications, included in accordance with the value of n. Contents as
octets 47 to 58, 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. (4) The reference and forecast times are successively set to their initial plus or minus the increment, as defined by the type of time increment (one of octets 48,60,72...). 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 time. |