navigation information in GRIB2 datasets on THREDDS server

• Subject: navigation information in GRIB2 datasets on THREDDS server
• Date: Tue, 5 Sep 2006 12:45:08 -0500

Grid Definition Template 3.30: Lambert conformal

 Octet Number(s) Contents 15 Shape of the earth (see Code Table 3.2) 16 Scale factor of radius of spherical earth 17-20 Scaled 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 Nx - number of points along the X-axis 35-38 Ny - number of points along the Y-axis 39-42 La1 - latitude of first grid point 43-46 Lo1 - longitude of first grid point 47 Resolution and component flags (See Flag Table 3.3) 48-51 LaD - Latitude where Dx and Dy are specified 52-55 LoV - Longitude of meridian parallel to Y-axis along which latitude increases as the Y- coordinate increases 56-59 Dx - X-direction grid length (see note (1)) 60-63 Dy - Y-direction grid length (see note (1)) 64 Projection centre flag (see Flag Table 3.5) 65 Scanning mode (see Flag Table 3.4) 66-69 Latin 1 - first latitude from the pole at which the secant cone cuts the sphere 70-73 Latin 2 - second latitude from the pole at which the secant cone cuts the sphere 74-77 Latitude of the southern pole of projection 78-81 Longitude of the southern pole of projection

Table 2:

char Lambert_Conformal ;

Lambert_Conformal:grid_mapping_name = "lambert_conformal_conic" ;

Lambert_Conformal:standard_parallel = 25. ;

Lambert_Conformal:longitude_of_central_meridian = 265. ;

Lambert_Conformal:latitude_of_projection_origin = 25. ;

Lambert_Conformal:GRIB_earth_shape = "Earth spherical with radius of 6371229.0 m" ;

Lambert_Conformal:GRIB_earth_shape_code = 6 ;

Lambert_Conformal:DODS:strlen = 0 ;

double y(y) ;

y:units = "km" ;

y:long_name = "y coordinate of projection" ;

y:standard_name = "projection_y_coordinate" ;

y:grid_spacing = "12.191001 km" ;

y:_CoordinateAxisType = "GeoY" ;

double x(x) ;

x:units = "km" ;

x:long_name = "x coordinate of projection" ;

x:standard_name = "projection_x_coordinate" ;

x:grid_spacing = "12.191001 km" ;

x:_CoordinateAxisType = "GeoX" ;

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David Wojtowicz, Sr. Research Programmer, Sysadmin
Dept of Atmospheric Sciences / Computer Services
University of Illinois at Urbana-Champaign