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C Copyright 1981-2012 ECMWF.
C
C This software is licensed under the terms of the Apache Licence
C Version 2.0 which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
C
C In applying this licence, ECMWF does not waive the privileges and immunities
C granted to it by virtue of its status as an intergovernmental organisation
C nor does it submit to any jurisdiction.
C
C!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
C
C ECMWF local GRIB use definition 4.
C Ocean model data.
C ----------------------------------
C
C For use in storing ocean model data within the GRIB framework.
C T.Stockdale, 17 May 1993
C
C Numbers given are words of KSEC1
C
C
C Standard ECMWF supplementary data (as per local use definition 1)
C for words 38-41 ie
C
C 38 Class (ops/research)
C 39 Type (analysis/forecast/etc)
C 40 Stream
C 41 Expver (expt identifier)
C
C 42 Ensemble forecast number
C 43 Total number of forecasts in ensemble
C
C If stream = 1090 (ECMWF ensemble seasonal forecasts),
C 42 Ensemble forecast number
C 43 0
C
C Data specific to ocean model requirements
C
C ** A separate version of code table 2 is used for ocean data
C ECMWF local Code Table 2, Version Number 150 for FM92-VIII
C
C ** Note that all coordinates in this local use GRIB definition are
C given as 4-byte integers in the following units:
C
C Latitudes/longitudes: microdegrees
C Distance (general): metres (default: can be changed)
C Time: seconds (default: can be changed)
C
C Depth below sea level: millimetres (positive downwards)
C Isopycnic level: (potential density - 1000)*1.0E6
C
C ** Permitted range of values is -2.147E9 < i < 2.147E9 approx.
C
C ** At several points in the definition, there is a potential need
C for a variable amount of supplementary data. This is indicated
C with '(+INFO)', and in such cases a supplementary data block is
C specified at the end of the local use section.
C
C
C 1. Coordinate structure definition
C
C The physical meaning of the (x,y,z,t) coordinate system is
C defined here.
C
C 44 Fundamental spatial reference system (Planet flag)
C 0 = Earth (centre/north pole/Greenwich)
C 200 = Geocentric RA/dec
C 201 = Heliocentric coordinates
C 255 = Unspecified
C
C 45 Fundamental time reference
C 0 = Reference time given in standard GRIB header
C (use for forecasts to indicate start of prediction)
C 1 = C.E. (ie 0 AD)
C 2 = Julian Day number = 0.0
C 100 = Zero at start of arbitrary expt
C 255 = Unspecified
C
C 46 Space unit flag (applies only if lengths NOT otherwise
C labelled)
C 0 = metres
C i<128 = 10**i metres
C i>128 = 10**(i-256) metres
C
C 47 Vertical coordinate definition (z)
C 0 = z above origin
C 1 = R from origin
C 2 = h above mean sea level geopotential
C 3 = h above ground surface
C 160 = geopotential depth below mean sea level (mm)
C 161 = ocean isopycnic surface (pot. dens.: see above)
C
C 48 Horizontal coordinate definition (x,y)
C 0 = latitude/longitude (microdegrees)
C 1 = cartesian (fundamental origin)
C 2 = cartesian (shifted,rotated origin) (+INFO)
C 3 = regular gaussian grid (microdegrees) (+INFO)
C 4 = polar stereographic (+INFO)
C 5 = spherical harmonic coefficients (integers) (+INFO)
C
C 49 Time unit flag
C 0 = seconds
C 1 = minutes
C 2 = hours
C 3 = days
C 4 = years
C 5<i<128 = 10**(i-4) years
C i>128 = 10**(i-256) seconds
C
C 50 Time coordinate definition (t)
C 0 = real earth time (UTC)
C 1 = ideal earth time (360 * 86400s days per year)
C
C 2. Position definition
C
C A 2-dimensional field located in 4-dimensional space-time needs
C 2 coordinates to define where the field is located, and 2
C coordinates internal to the field. The locating coordinates are
C specified first. Each coordinate is identified according to the
C following table, and should be in this order where possible:
C
C 1 t
C 2 z
C 3 x
C 4 y
C
C It is possible to specify mixed coordinates, to allow sections
C at angles to the coordinate system.
C
C 51 Mixed coordinate field flag
C 0 = No mixed coordinates
C 1 = x,y coordinates mixed (+INFO)
C 2 = x,z coordinates mixed (+INFO)
C 3 = y,z coordinates mixed (+INFO)
C 4 = x,t coordinates mixed (+INFO)
C 5 = y,t coordinates mixed (+INFO)
C 6 = z,t coordinates mixed (+INFO)
C
C
C Now define the location of the 2-dimensional field:
C
C 52 Coordinate 1 flag (usually time)
C 53 Averaging flag
C 0 = no averaging (data on/at level 1)
C 1 = inclusive average between level 1 and 2
C 2 = exclusive average between level 1 and 2
C 54 Position of level 1 (4 byte integer)
C 55 Position of level 2 (4 byte integer) (or zero if not used)
C
C 56 Coordinate 2 flag (usually z-coordinate)
C 57 Averaging flag
C 0 = no averaging (data on/at level 1)
C 1 = inclusive average between level 1 and 2
C 2 = exclusive average between level 1 and 2
C 58 Position of level 1 (4 byte integer)
C 59 Position of level 2 (4 byte integer) (or zero if not used)
C
C An inclusive average discards land points when calculating the
C average, and will produce a value where there is at least one
C valid ocean point. An exclusive average will only produce a
C value if all of the points being averaged are valid.
C
C
C 3. Grid definition
C
C 60 Coordinate 3 flag (x-axis, usually longitude)
C 61 Coordinate 4 flag (y-axis, usually latitude)
C
C 62 Coordinate 4 of first grid point (4-byte integer)
C 63 Coordinate 3 of first grid point (4-byte integer)
C 64 Coordinate 4 of last grid point (4-byte integer)
C 65 Coordinate 3 of last grid point (4-byte integer)
C 66 i-increment (also stored as a 4-byte integer)
C 67 j-increment (also stored as a 4-byte integer)
C
C
C 68 Flag for irregular grid coordinate list
C 0 = none
C 1 = x-axis values (typically longitude)
C 2 = y-axis values (typically latitude)
C 3 = First x-axis, then y-axis values given
C 69 Flag for normal or staggered grid
C 0 = normal grid (all rows have same x-coordinate system)
C 1 = staggered grid (odd and even rows have different
C x-coordinate systems, eg Arakawa E grid)
C
C 4. Further information
C
C 70 Flag for any further information
C 0 = none
C 1 = auxiliary array contains x-axis topographic
C depths/heights
C
C 5. Auxiliary information
C
C 71 Number of entries in horizontal coordinate definition
C supplement (1 byte only)
C 72 Number of entries in mixed coordinate definition (2 bytes)
C 73 Number of entries in grid coordinate list (2 bytes)
C 74 Number of entries in auxiliary array (2 bytes)
C
C [ 64 bytes fixed ]
C
C A. Horizontal coordinate supplement (4-byte integers)
C
C A1-nn Not yet defined
C
C B. Mixed coordinate definition (4-byte integers)
C
C [ For the linear case, assume a transformation of the form
C x' = alpha * (x - x0) + (1-alpha) * (y - y0) ]
C
C B1 Flag for regularity of x-y coordinate mixing
C 0 = Mixing is regular and linear
C 1 = Mixing is irregular, code given
C For regular, linear mixing:
C B2 Alpha (*1E9)
C B3 X0
C B4 Y0
C Irregular mixing with code given:
C B2 )
C B3 ) Locally defined codes to define section
C B4 )
C
C C. Grid coordinate list (4-byte integers)
C
C C1-nn Coordinates of irregular x and y-axes. The x-axis is
C given first, then the second x-axis (if staggered grid),
C and then the y-axis. If the x-axis is regular but
C staggered, then the longitude of the first point of the
C second row should be specified as the first entry of this
C list.
C
C D. Auxiliary array (4-byte integers)
C
C D1-nn Auxiliary array values
C
C E. Post-auxiliary array (4-byte integers)
C
C P0-n Post-auxiliary array values
C
C P0 - Count of items in post-auxiliary array
C ( = n+1, including the count)
C P1 - First item.
C P2 - Second item.
C " - "
C Pn - nth item.
C
C
C Comments on the setting of other GRIB parameters:
C
C The time and time-range data should be set properly in the main
C section, if possible.
C
C The indicator of type of level should be set to 160 (depth below
C sea level) for all oceanographic data. The depth in metres
C should be set to the appropriate value if the field is a
C horizontal section, and to zero in all other cases.
C
C It is assumed that the grid description section of the GRIB code
C is set for a latitude/longitude grid, with correct values for
C the number of points along parallels/meridians and the
C coordinates of the first and last data points in millidegrees
C (or the appropriate units from this section, divided by 1000).
C The coordinate increments should be given to the extent that
C the field is regular.
C
C
C!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
C
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