VM - GRIB - WMO version 9 Template

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Values

Grid definition template 3.0 - latitude/longitude (or equidistant cylindrical, or Plate Carrée)

Octet Number	Description	Note	Status
15	Shape of the Earth	Code/Flag Table 3.2	Operational
16	Scale factor of radius of spherical Earth		Operational
17-20	Scaled value of radius of spherical Earth		Operational
21	Scale factor of major axis of oblate spheroid Earth		Operational
22-25	Scaled value of major axis of oblate spheroid Earth		Operational
26	Scale factor of minor axis of oblate spheroid Earth		Operational
27-30	Scaled value of minor axis of oblate spheroid Earth		Operational
31-34	Ni - number of points along a parallel		Operational
35-38	Nj - number of points along a meridian		Operational
39-42	Basic angle of the initial production domain	(see Note 1)	Operational
43-46	Subdivisions of basic angle used to define extreme longitudes and latitudes, and direction increments	(see Note 1)	Operational
47-50	La1 - latitude of first grid point	(see Note 1)	Operational
51-54	Lo1 - longitude of first grid point	(see Note 1)	Operational
55	Resolution and component flags	Code/Flag Table 3.3	Operational
56-59	La2 - latitude of last grid point	(see Note 1)	Operational
60-63	Lo2 - longitude of last grid point	(see Note 1)	Operational
64-67	Di - i direction increment	(see Note 1)	Operational
68-71	Dj - j direction increment	(see Note 1)	Operational
72	Scanning mode	Code/Flag Table 3.4	Operational
73-nn	List of number of points along each meridian or parallel.	(These octets are only present for quasi-regular grids as described in Notes 2 and 3)	Operational

3.1

Grid definition template 3.1 - rotated latitude/longitude (or equidistant cylindrical, or Plate Carrée)

Octet Number	Description	Note	Status
15-72	Same as Grid definition template 3.0	(see Note 1)	Operational
73-76	Latitude of the southern pole of projection		Operational
77-80	Longitude of the southern pole of projection		Operational
81-84	Angle of rotation of projection		Operational
85-nn	List of number of points along each meridian or parallel.	(These octets are only present for quasi-regular grids as described in Note 3)	Operational

3.10

Grid definition template 3.10 - Mercator

Octet Number	Description	Note	Status
15	Shape of the Earth	Code/Flag Table 3.2	Operational
16	Scale factor of radius of spherical Earth		Operational
17-20	Scaled value of radius of spherical Earth		Operational
21	Scale factor of major axis of oblate spheroid Earth		Operational
22-25	Scaled value of major axis of oblate spheroid Earth		Operational
26	Scale factor of minor axis of oblate spheroid Earth		Operational
27-30	Scaled value of minor axis of oblate spheroid Earth		Operational
31-34	Ni - number of points along a parallel		Operational
35-38	Nj - number of points along a meridian		Operational
39-42	La1 - latitude of first grid point		Operational
43-46	Lo1 - longitude of first grid point		Operational
47	Resolution and component flags	Code/Flag Table 3.3	Operational
48-51	LaD - latitude(s) at which the Mercator projection intersects the Earth (Latitude(s) where Di and Dj are specified)		Operational
52-55	La2 - latitude of last grid point		Operational
56-59	Lo2 - longitude of last grid point		Operational
60	Scanning mode	Code/Flag Table 3.4	Operational
61-64	Orientation of the grid, angle between i direction on the map and the Equator	(see Note 1)	Operational
65-68	Di - longitudinal direction grid length	(see Note 2)	Operational
69-72	Dj - latitudinal direction grid length	(see Note 2)	Operational
73-nn	List of number of points along each meridian or parallel.	Code/Flag Table 3.1	Operational

3.100

Grid definition template 3.100 - triangular grid based on an icosahedron (see Attachment, Volume I.2, Part B, Att.GRIB)

Octet Number	Description	Note	Status
15	n2 - exponent of 2 for the number of intervals on main triangle sides		Operational
16	n3 - exponent of 3 for the number of intervals on main triangle sides		Operational
17-18	ni - number of intervals on main triangle sides of the icosahedron		Operational
19	nd - number of diamonds		Operational
20-23	Latitude of the pole point of the icosahedron on the sphere		Operational
24-27	Longitude of the pole point of the icosahedron on the sphere		Operational
28-31	Longitude of the centre line of the first diamond of the icosahedron on the sphere		Operational
32	Grid point position	Code/Flag Table 3.8	Operational
33	Numbering order of diamonds	Code/Flag Table 3.9	Operational
34	Scanning mode for one diamond	Code/Flag Table 3.10	Operational
35-38	nt - total number of grid points		Operational

3.1000

Grid definition template 3.1000 - cross-section grid with points equally spaced on the horizontal

Octet Number	Description	Note	Status
15	Shape of the Earth	Code/Flag Table 3.2	Experimental
16	Scale factor of radius of spherical Earth		Experimental
17-20	Scaled value of radius of spherical Earth		Experimental
21	Scale factor of major axis of oblate spheroid Earth		Experimental
22-25	Scaled value of major axis of oblate spheroid Earth		Experimental
26	Scale factor of minor axis of oblate spheroid Earth		Experimental
27-30	Scaled value of minor axis of oblate spheroid Earth		Experimental
31-34	Number of horizontal points		Experimental
35-38	Basic angle of the initial production domain	(see Note 1)	Experimental
39-42	Subdivisions of basic angle used to define extreme longitudes and latitudes	(see Note)	Experimental
43-46	La1 - latitude of first grid point	(see Note 1)	Experimental
47-50	Lo1 - longitude of first grid point	(see Note 1)	Experimental
51	Scanning mode	Code/Flag Table 3.4	Experimental
52-55	La2 - latitude of last grid point	(see Note 1)	Experimental
56-59	Lo2 - longitude of last grid point	(see Note 1)	Experimental
60	Type of horizontal line	Code/Flag Table 3.20	Experimental
61-62	Number of vertical points		Experimental
63	Physical meaning of vertical coordinate	Code/Flag Table 3.15	Experimental
64	Vertical dimension coordinate values definition	Code/Flag Table 3.21	Experimental
65-66	NC - number of coefficients or values used to specify vertical coordinates		Experimental
67-(66+NC*4)	Coefficients to define vertical dimension coordinate values in functional form, or the explicit coordinate values (IEEE 32-bit floating-point values)		Experimental

3.110

Grid definition template 3.110 - Equatorial azimuthal equidistant projection

Octet Number	Description	Note	Status
15	Shape of the Earth	Code/Flag Table 3.2	Operational
16	Scale factor of radius of spherical Earth		Operational
17-20	Scaled value of radius of spherical Earth		Operational
21	Scale factor of major axis of oblate spheroid Earth		Operational
22-25	Scaled value of major axis of oblate spheroid Earth		Operational
26	Scale factor of minor axis of oblate spheroid Earth		Operational
27-30	Scaled value of minor axis of oblate spheroid Earth		Operational
31-34	Nx - number of points along x-axis		Operational
35-38	Ny - number of points along y-axis		Operational
39-42	La1 - latitude of tangency point (centre of grid)		Operational
43-46	Lo1 - longitude of tangency point		Operational
47	Resolution and component flags	Code/Flag Table 3.3	Operational
48-51	Dx - x-direction grid length in units of 10-3 m as measured at the point of the axis		Operational
52-55	Dy - y-direction grid length in units of 10-3 m as measured at the point of the axis		Operational
56	Projection centre flag		Operational
57	Scanning mode	Code/Flag Table 3.4	Operational

3.1100

Grid definition template 3.1100 - Hovmöller diagram grid with points equally spaced on the horizontal

Octet Number	Description	Note	Status
15	Shape of the Earth	Code/Flag Table 3.2	Experimental
16	Scale factor of radius of spherical Earth		Experimental
17-20	Scaled value of radius of spherical Earth		Experimental
21	Scale factor of major axis of oblate spheroid Earth		Experimental
22-25	Scaled value of major axis of oblate spheroid Earth		Experimental
26	Scale factor of minor axis of oblate spheroid Earth		Experimental
27-30	Scaled value of minor axis of oblate spheroid Earth		Experimental
31-34	Number of horizontal points		Experimental
35-38	Basic angle of the initial production domain	(see Note)	Experimental
39-42	Subdivisions of basic angle used to define extreme longitudes and latitudes	(see Note)	Experimental
43-46	La1 - latitude of first grid point	(see Note)	Experimental
47-50	Lo1 - longitude of first grid point	(see Note)	Experimental
51	Scanning mode	Code/Flag Table 3.4	Experimental
52-55	La2 - latitude of last grid point	(see Note)	Experimental
56-59	Lo2 - longitude of last grid point	(see Note)	Experimental
60	Type of horizontal line	Code/Flag Table 3.20	Experimental
61-64	NT - number of time steps		Experimental
65	Unit of offset from reference time	Code/Flag Table 4.4	Experimental
66-69	Offset from reference of first time (negative value when first bit set)		Experimental
70	Type of time increment	Code/Flag Table 4.11	Experimental
71	Unit of time increment	Code/Flag Table 4.4	Experimental
72-75	Time increment (negative value when first bit set)		Experimental
	76-82 Last date/time		Experimental
76-77	Year		Experimental
78	Month		Experimental
79	Day		Experimental
80	Hour		Experimental
81	Minute		Experimental
82	Second		Experimental

3.120

Grid definition template 3.120 - azimuth-range projection

Octet Number	Description	Note	Status
15-18	Nb - number of data bins along radials	(see Note)	Operational
19-22	Nr - number of radials		Operational
23-26	La1 - latitude of centre point		Operational
27-30	Lo1 - longitude of centre point		Operational
31-34	Dx - spacing of bins along radials		Operational
35-38	Dstart - offset from origin to inner bound		Operational
39	Scanning mode	Code/Flag Table 3.4	Operational
	40-(39+4Nr) For each of Nr radials:		Operational
(40+4(X-1))-(41+4(X-1))	Azi - starting azimuth, degrees*10 (degrees as north)		Operational
(42+4(X-1))-(43+4(X-1))	Adelta - azimuthal width, degrees*100 (+ clockwise, - counterclockwise), with X = 1 to Nr		Operational

3.1200

Grid definition template 3.1200 - time section grid

Octet Number	Description	Note	Status
15-18	NT - number of time steps		Experimental
19	Unit of offset from reference time	Code/Flag Table 4.4	Experimental
20-23	Offset from reference of first time (negative value when first bit set)		Experimental
24	Type of time increment	Code/Flag Table 4.11	Experimental
25	Unit of time increment	Code/Flag Table 4.4	Experimental
26-29	Time increment (negative value when first bit set)		Experimental
	30-36 Last date/time		Experimental
30-31	Year		Experimental
32	Month		Experimental
33	Day		Experimental
34	Hour		Experimental
35	Minute		Experimental
36	Second		Experimental
37-38	Number of vertical points		Experimental
39	Physical meaning of vertical coordinate	Code/Flag Table 3.15	Experimental
40	Vertical dimension coordinate values definition	Code/Flag Table 3.21	Experimental
41-42	NC - number of coefficients or values used to specify vertical coordinates		Experimental
43-(42+NC*4)	Coefficients to define vertical dimension coordinate values in functional form, or the explicit coordinate values (IEEE 32-bit floating-point values)		Experimental

3.2

Grid definition template 3.2 - stretched latitude/longitude (or equidistant cylindrical, or Plate Carrée)

Octet Number	Description	Note	Status
15-72	Same as Grid definition template 3.0	(see Note 1)	Operational
73-76	Latitude of the pole of stretching		Operational
77-80	Longitude of the pole of stretching		Operational
81-84	Stretching factor		Operational
85-nn	List of number of points along each meridian or parallel.	(These octets are only present for quasi-regular grids as described in Note 3)	Operational

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