GRIB2 - PRODUCT DEFINITION TEMPLATE 4.50

Analysis or forecast of multi component parameter
or matrix element at point in time

Created 01/18/2012
VALIDATION

Notes:  VALIDATION means the corresponding entry is not yet
official and could change at any time, so it should not be used for any official products.


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 octet 18
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 First dimension physical significance (see Code Table 5.3) (see Note 2)
36 Second dimension physical significance (see Code Table 5.3) (see Note 2)
37-40 First dimension coordinate value (IEEE 32-bit floating-point value)
41-44 Second dimension coordinate value (IEEE 32-bit floating-point value)
45-48 First dimension (rows) of the complex matrix (see note 3)
49-52 Second dimension (columns) of the complex matrix (see note 3)


Notes:

(1) Hours greater than 65534 will be coded as 65534.
(2) In case of ocean wave spectra e.g., according to Code Table 5.3, the physical signinficance values are 1 (Direction Degrees true) and 2 (Frequency (s-1).
(3) The dimensions define the number of GRIBs needed for reconstruction of a complete matrix (e.g. wave spectrum) at one or more grid points. In case of vectors (1-dim-matrices), the second dimension must be set to 1 and the second dimension physical significance must be set to 255 (missing). In case of multi component parameter (e.g. no matrix or vector element), first and second dimension are set to 1.



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