GRIB2 - GRID DEFINITION TEMPLATE 3.44

Latitude/Longitude with Data-Sampling From A
Higher Resolution Latitude/Longitude Source-grid

Created 01/11/2012
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
15 Shape of the Earth (See Code Table 3.2)
16 Scale Factor of radius of spherical Earth
17-20 Scale value of radius of spherical Earth
21 Scale factor of major axis of oblate spheroid Earth
22-25 Scaled value of major axis of oblate spheroid Earth
26 Scale factor of minor axis of oblate spheroid Earth
27-30 Scaled value of minor axis of oblate spheroid Earth
31-34 Ni—number of points along a parallel     
35-38 Nj—number of points along a meridian
39-42 Basic angle of the initial production domain (see Note 1)
43-46 Subdivisions of basic angle used to define extreme longitudes and latitudes, and direction increments (see Note 1)
47-50 La1—latitude of first grid point (see Note 1)
51-54 Lo1—longitude of first grid point (see Note 1)
55 Resolution and component flags (see Flag Table 3.3)
56-59 La2—latitude of last grid point (see Note 1)
60-63 Lo2—longitude of last grid point (see Note 1)
64-67 Di—i direction increment (see Note1)     
68-71 Dj—j direction increment (see Note 1)
72 Scanning mode (flags — see Flag Table 3.4)
73-76 Nis - Number of points along a parallel in source-grid
77-80 Njs - Number of points along a meridian in source-grid
81-84
Basic angle of the initial production domain for source-grid (see Note 1)
85-88
Subdivisions of basic angle used to describe extreme latitudes and longitudes, direction increments and differencing of latitudes and longitudes for the source-grid (see Note 1)
89-92 La1S- Latitude of first grid point of source-grid (see Note 1)
93-96 Lo1S- Longitude of first grid point of source-grid (see Note 1)
97 Resolution and component flags of source-grid (see Table 3.3)
98-101 La2S- Latitude of last point of source-grid (see Note 1)
102-105 Lo2S- Longitude of last point of source-grid (see Note 1)
106-1096 Dis—i direction increment of source-grid (see Note 1)     
110-113 Djs—j direction increment of source-grid (see Note 1)
114 Type of sampling employed to select data from source-grid (See code Table 3.30)
115-118 For statistical sampling over a rectangular Lat/Lon area, (latitude of top of rectangle - latitude of nominal point).
For statistical sampling over a rectangular surface area, (distance in metres between top of rectangle and the nominal point)
119-122 For statistical sampling over a rectangular Lat/Lon area, (latitude of bottom of rectangle - latitude of nominal point). (see Note)
For statistical sampling over a rectangular surface area, (distance in metres between bottom of rectangle and the nominial point)
123-126 For statistical sampling over a rectangular Lat/Lon area, (longitude of right side of rectangle - longitude of nominal point).
For statistical sampling over a rectangular surface area, (distance in metres between right side of rectangle and the nominal point)
127-130 For statistical sampling over a rectangular Lat/Lon area, (longitude of left side of rectangle - longitude of nominal point).
For statistical sampling over a rectangular surface area, (distance in metres between left side of rectangle and the nominal point)


Notes:

1. Basis angle of the initial production domain and subdivisions of this basic angle are provided to manage cases where the recommended unit of 10-6 degrees is not applicable to describe the extreme longitudes and latitudes, and direction increments. For these last six descriptors, the unit is equal to the ratio of the basic angle and the subdivisions number.  For ordinary cases, zero and missing values should be coded, equivalent to respective values of 1 and 106 (10-6 degrees unit).



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