def geos2cf(proj_dict):
    """Return the cf grid mapping from a geos proj dict.
    """
    return {'grid_mapping_name': 'geostationary',
        'latitude_of_projection_origin': 0.0,
        'longitude_of_projection_origin': eval(proj_dict['lon_0']),
        'semi_major_axis': eval(proj_dict['a']), 'semi_minor_axis': eval(
        proj_dict['b']), 'perspective_point_height': eval(proj_dict['h'])}
