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import cf
import numpy
#---------------------------------------------------------------------
# 1. Create the field's domain items
#---------------------------------------------------------------------
# Create a grid_latitude dimension coordinate
dim0 = cf.DimensionCoordinate(properties={'standard_name': 'grid_latitude'},
data=cf.Data(numpy.arange(10.), 'degrees'))
# Create a grid_longitude dimension coordinate
dim1 = cf.DimensionCoordinate(data=cf.Data(numpy.arange(9.), 'degrees'))
dim1.standard_name = 'grid_longitude'
# Create a time dimension coordinate (with bounds)
bounds = cf.CoordinateBounds(
data=cf.Data([0.5, 1.5], cf.Units('days since 2000-1-1', calendar='noleap')))
dim2 = cf.DimensionCoordinate(properties=dict(standard_name='time'),
data=cf.Data(1, cf.Units('days since 2000-1-1',
calendar='noleap')),
bounds=bounds)
# Create a longitude auxiliary coordinate
aux0 = cf.AuxiliaryCoordinate(data=cf.Data(numpy.arange(90).reshape(10, 9),
'degrees_north'))
aux0.standard_name = 'latitude'
# Create a latitude auxiliary coordinate
aux1 = cf.AuxiliaryCoordinate(properties=dict(standard_name='longitude'),
data=cf.Data(numpy.arange(1, 91).reshape(9, 10),
'degrees_east'))
# Create a rotated_latitude_longitude grid mapping transform
trans0 = cf.Transform(grid_mapping_name='rotated_latitude_longitude',
grid_north_pole_latitude=38.0,
grid_north_pole_longitude=190.0)
# --------------------------------------------------------------------
# 2. Create the field's domain from the previously created items
# --------------------------------------------------------------------
domain = cf.Domain(dim=[dim0, dim1, dim2],
aux=[aux0, aux1],
trans=trans0,
assign_axes={'aux1': ['dim1', 'dim0']})
#---------------------------------------------------------------------
# 3. Create the field
#---------------------------------------------------------------------
# Create CF properties
properties = {'standard_name': 'eastward_wind',
'long_name' : 'East Wind',
'cell_methods' : cf.CellMethods('latitude: point')}
# Create the field's data array
data = cf.Data(numpy.arange(90.).reshape(9, 10), 'm s-1')
# Finally, create the field
f = cf.Field(properties=properties,
domain=domain,
data=data,
axes=domain.axes(['grid_long', 'grid_lat'], ordered=True))
print "The new field:\n"
print f
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