Added doc/Gridmapping

doc/Gridmapping

+
+=======================================
+Example 1: rotated_latitude_longitude
+=======================================
+
+	rlon = 106 ;
+	rlat = 111 ;
+	float lon(rlat, rlon) ;
+		lon:long_name = "longitude" ;
+		lon:units = "degrees_east" ;
+		lon:standard_name = "grid_longitude" ;
+	float lat(rlat, rlon) ;
+		lat:long_name = "latitude" ;
+		lat:units = "degrees_north" ;
+		lat:standard_name = "grid_latitude" ;
+        float rlat(rlat) ;
+		rlat:standard_name = "grid_latitude" ;
+		rlat:long_name = "rotated latitude" ;
+		rlat:units = "degrees" ;
+	float rlon(rlon) ;
+		rlon:standard_name = "grid_longitude" ;
+		rlon:long_name = "rotated longitude" ;
+		rlon:units = "degrees" ;
+	char rotated_pole ;
+		rotated_pole:long_name = "coordinates of the rotated North Pole" ;
+		rotated_pole:grid_mapping_name = "rotated_latitude_longitude" ;
+		rotated_pole:grid_north_pole_latitude = 39.25f ;
+		rotated_pole:grid_north_pole_longitude = -162.f ;
+	float T_2M_AV(time, height_2m, rlat, rlon) ;
+		T_2M_AV:standard_name = "air_temperature" ;
+		T_2M_AV:units = "K" ;
+		T_2M_AV:coordinates = "lon lat" ;
+
+gridtype = GRIB_CURVILINEAR
+xsize = 334
+ysize = 334
+xname = lon
+xvals = ...
+yname = lat
+yvals = ...
+xdimname = rlon
+ydimname = rlat
+projection = rotated_latitude_longitude
+pname  = rotated_pole
+pxvals = ....
+pyvals = ....
+grid_north_pole_latitude = 39.25f
+grid_north_pole_longitude = -162.f
+long_name = "coordinates of the rotated North Pole"
+
+=======================================
+Example 2: lambert_azimuthal_equal_area
+=======================================
+
+        x = 334 ;
+	y = 334 ;
+
+        double x(x) ;
+		x:standard_name = "projection_x_coordinate" ;
+		x:units = "m" ;
+		x:axis = "X" ;
+	double y(y) ;
+		y:standard_name = "projection_y_coordinate" ;
+		y:units = "m" ;
+		y:axis = "Y" ;
+	char laea ;
+		laea:grid_mapping_name = "lambert_azimuthal_equal_area" ;
+		laea:earth_radius = 6370997. ;
+		laea:longitude_of_projection_origin = 0. ;
+		laea:latitude_of_projection_origin = 90. ;
+	float CFC_FC_F(time, y, x) ;
+		CFC_FC_F:grid_mapping = "laea" ;
+
+gridtype = GRIB_CURVILINEAR
+xsize = 334
+ysize = 334
+projection = lambert_azimuthal_equal_area
+pxvals = ....
+pyvals = ....
+earth_radius = 6370997.
+longitude_of_projection_origin = 0.
+latitude_of_projection_origin = 90.
+
+cdo gen_geoloc ifile ofile
+//cdo del_geoloc ifile ofile
+
+gridtype = GRIB_CURVILINEAR
+xsize = 334
+ysize = 334
+xvals = ....
+yvals = ....
+xbounds = ....
+ybounds = ....
+projection = lambert_azimuthal_equal_area
+pxvals = ....
+pyvals = ....
+earth_radius = 6370997.
+longitude_of_projection_origin = 0.
+latitude_of_projection_origin = 90.
+
+cdo del_proj ifile ofile
+
+gridtype = GRIB_CURVILINEAR
+xsize = 334
+ysize = 334
+xvals = ....
+yvals = ....
+xbounds = ....
+ybounds = ....
+