GRIB2 - PRODUCT DEFINITION TEMPLATE 4.1101

Hovmoller-type grid with averaging or other
statistically-processed

Created 09/21/2007

Preliminary note: This template is simply experimental, was not validated at the time of
publication and should be used only for bilateral previously-agreed tests. (Octets 35-50 are
very similar to octets 43-58 of product definition template 4.8, but the meaning
of some fields differs slightly)


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
 Analysis or forecast generating process identifier (see Code ON388 Table A)
15-16 Hours of observational data cutoff after reference time (see Note 1)
17
 Minutes of observational data cutoff after reference time
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 surface (see Code Table 4.5)
30
 Scale factor of second fixed surface
31-34 Scaled value of second fixed surface
35-38 Total number of data values missing in the statistical process
39
 Statistical process used to calculate the processed field from the field at each time increment during the time range (see Code Table 4.10)
40
 Type of time increment between successive fields used in the statistical processing (see Code Table 4.11)
41
 Indicator of unit of time for time range over which processing is dome (see Code Table 4.4)
42-45
 Length of the time range over which statistical processing is done, in units defined by the previous octet
46
 Indicator of unit of time for increment between the successive fields used (see Code Table 4.4)
47-50
 Time increment between successive fields, in units defined by the previous octet (see Note 3)


Notes:

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

(2) Reference = reference time (section 1) + range (PDT) + offset and increments from reference time (GDT).
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.


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