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import cf
import numpy
import os
def test():
print '----------------------------------------------------------'
print 'Create a field'
print '----------------------------------------------------------'
# Dimension coordinates
dim0 = cf.Coordinate(data=cf.Data(numpy.arange(10.), 'degrees'))
dim0.standard_name = 'grid_latitude'
dim1 = cf.Coordinate(data=cf.Data(numpy.arange(9.) + 20, 'degrees'))
dim1.standard_name = 'grid_longitude'
dim1.Data[-1] += 5
bounds = cf.Data(numpy.array([dim1.Data.array-0.5, dim1.Data.array+0.5]).transpose((1,0)))
bounds[-2,1] = 30
bounds[-1,:] = [30, 36]
dim1.insert_bounds(cf.Bounds(data=bounds))
dim2 = cf.Coordinate(data=cf.Data(1.5), bounds=cf.Data([1, 2.]))
dim2.standard_name = 'atmosphere_hybrid_height_coordinate'
# Auxiliary coordinates
aux0 = cf.Coordinate(data=cf.Data(10., 'm'))
aux0.id = 'atmosphere_hybrid_height_coordinate_ak'
aux0.insert_bounds(cf.Data([5, 15.], aux0.Units))
aux1 = cf.Coordinate(data=cf.Data(20.))
aux1.id = 'atmosphere_hybrid_height_coordinate_bk'
aux1.insert_bounds(cf.Data([14, 26.]))
aux2 = cf.Coordinate(
data=cf.Data(numpy.arange(-45, 45, dtype='int32').reshape(10, 9),
units='degree_N'))
aux2.standard_name = 'latitude'
aux3 = cf.Coordinate(
data=cf.Data(numpy.arange(60, 150, dtype='int32').reshape(9, 10),
units='degreesE'))
aux3.standard_name = 'longitude'
aux4 = cf.AuxiliaryCoordinate(
data=cf.Data(['alpha','beta','gamma','delta','epsilon',
'zeta','eta','theta','iota','kappa']))
aux4.standard_name = 'greek_letters'
aux4.subspace[0] = cf.masked
# Cell measures
cm0 = cf.CellMeasure(
data=cf.Data(1+numpy.arange(90.).reshape(9, 10)*1234, 'km 2'))
cm0.measure = 'area'
# Transforms
trans0 = cf.Transform(name='rotated_latitude_longitude',
grid_north_pole_latitude=38.0,
grid_north_pole_longitude=190.0)
# Data
data = cf.Data(numpy.arange(90.).reshape(10, 9), 'm s-1')
# Domain
domain = cf.Domain(dim=(dim0, dim1, dim2),
aux=[aux0, aux1, aux2, aux3, aux4],
cm={'cm0': cm0},
trans=(trans0,),
assign_axes={'aux0': ['dim2'],
'aux1': ['dim2'],
'aux4': ['dim0'],
'aux3': ['dim1', 'dim0'],
'cm0' : ['dim1', 'dim0']},
)
properties = {'standard_name': 'eastward_wind'}
f = cf.Field(properties=properties, domain=domain, data=data)
orog = f.copy()
orog.standard_name = 'surface_altitude'
orog.insert_data(cf.Data(f.array*2, 'm'))
orog.squeeze()
orog.remove_axes('dim2')
orog.transpose([1, 0])
t = cf.Transform(name='atmosphere_hybrid_height_coordinate',
a='aux0', b='aux1', orog=orog,
coord_terms=('a', 'b'))
f.domain.insert_transform(t)
# Ancillary variables
tmp = f.copy()
tmp.remove_items(role='t')
tmp.remove_item('aux0')
tmp.remove_item('atmosphere_hybrid_height_coordinate_bk')
f.ancillary_variables = cf.AncillaryVariables()
g = tmp.copy()
g.transpose([1,0])
g.standard_name = 'ancillary0'
g *= 0.01
g.remove_axes(g.axes().difference(g.data_axes()))
f.ancillary_variables.append(g)
g = tmp.copy()
g.standard_name = 'ancillary1'
g *= 0.01
g.remove_axes(g.axes().difference(g.data_axes()))
f.ancillary_variables.append(g)
g = tmp.copy()
g = g.subspace[0]
g.squeeze()
g.standard_name = 'ancillary2'
g *= 0.001
g.remove_axes(g.axes().difference(g.data_axes()))
f.ancillary_variables.append(g)
g = tmp.copy()
g = g.subspace[..., 0]
g.squeeze()
g.standard_name = 'ancillary3'
g *= 0.001
g.remove_axes(g.axes().difference(g.data_axes()))
f.ancillary_variables.append(g)
f.flag_values = [1,2,4]
f.flag_meanings = ['a', 'bb', 'ccc']
f.dump(complete=True)
print f
print repr(f)
# Write the file, and read it in
filename = os.path.join(os.path.dirname(os.path.abspath(__file__)),
'test_file.nc')
cf.write(f, filename)
g = cf.read(filename, squeeze=True)[0]
print 'G DUMP ========================================'
g.dump(complete=True)
assert g.equals(f, traceback=True), "Field not equal to itself read back in"
return f
print
print '---------------------------------------------------------------------------'
print 'All field creation tests passed for cf version', cf.__version__
print 'Running from', os.path.abspath(cf.__file__)
print '---------------------------------------------------------------------------'
print
#--- End: def
if __name__ == "__main__":
test()
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