#open a new blank netcdf file to which we will be writting data
    outRootGrp = Dataset(outNetCDF_File, 'w', format='NETCDF3_CLASSIC')

    if (inRootGrp.start_year != startDate.year):
        raise Exception("Specified simulation start year ({0}) does not match with input vapor pressure data file data year.".format(startDate.year))
        exit()

     # DEBUG: print global attributes of the original file:
##    for gAttribute in inRootGrp.ncattrs():
##        print 'Global attribute name:', gAttribute, '=', getattr(inRootGrp,gAttribute)


    # add global file level attributes to the new netcdf file
    outRootGrp.start_year = inRootGrp.start_year
    outRootGrp.data_variable_name = inRootGrp.data_variable_name
    outRootGrp.data_time_step = inTimeStep
    outRootGrp.orginal_data_source = 'Daymet Software Version 2.0'
    outRootGrp.conventions = 'CF-1.0'
    outRootGrp.modified_data_source = 'CI Water System'
    outRootGrp.spatial_reference = 'NAD83_UTM_Zone_12N'
    outRootGrp.datum = 'D_North_America_1983'

    # get dimension values from the original netcdf file
    inputTimeVar = inRootGrp.variables['time']
    inputXvar = inRootGrp.variables['x']
    inputYvar = inRootGrp.variables['y']
    inputVpVar = inRootGrp.variables[inRootGrp.data_variable_name]

    print(inputTimeVar.shape[0])
    print(inputXvar.shape[0])
    print(inputYvar.shape[0])
    inputTaTimeVar = inRootGrpTa.variables['time']

    inputVpVar = inRootGrpVp.variables[inRootGrpVp.data_variable_name]
    inputVpTimeVar = inRootGrpVp.variables['time']

    #DEBUG: print netcdf variable diemensions
    print('Dimension of Temp var: ' + str(inputTaVar.shape))
    print('Dimension of Vp var: ' + str(inputVpVar.shape))

    #open a new blank netcdf file to which we will be writting data
    outRootGrp = Dataset(outRH_NetCDFFile, 'w', format='NETCDF3_CLASSIC')

    # add global file level attributes to the new netcdf file
    outRootGrp.start_year = inRootGrpTa.start_year
    outRootGrp.data_variable_name = outNetCDFDataVariableName
    outRootGrp.data_time_step = inRootGrpTa.data_time_step
    outRootGrp.orginal_data_source = 'Daymet Software Version 2.0'
    outRootGrp.conventions = 'CF-1.0'
    outRootGrp.modified_data_source = 'CI Water System'
    outRootGrp.spatial_reference = 'NAD83_UTM_Zone_12N'
    outRootGrp.datum = 'D_North_America_1983'

    # create 3 dimensions for the output netcdf file
    outTimeDimensionSize = inputVpVar.shape[0]
    outYvarDimensionSize = inputVpVar.shape[1]
    outXvarDimensionSize = inputVpVar.shape[2]

    outRootGrp.createDimension('time', outTimeDimensionSize)
    outRootGrp.createDimension('x', outXvarDimensionSize)
    outRootGrp.createDimension('y', outYvarDimensionSize)