Error using netCDF4 num2date function

Question

I am working with an nc file.The file has an array of dimensions time, number, latitude, longitude. I was trying to convert time from number to date via the num2date method.

time_unit = nc.variables["time"].getncattr('units') # first read the 'units' attributes from the variable time
print(time_unit)
time_cal = nc.variables["time"].getncattr('calendar') # read calendar type
local_time = nc.num2date(t, units=time_unit, calendar=time_cal) # convert time
print("Original time %s is now converted as %s" % (time[0], local_time[0]))

But i am facing the following error.

AttributeError                            Traceback (most recent call last)
<ipython-input-124-d9912be48299> in <module>()
      2 print(time_unit)
      3 time_cal = nc.variables["time"].getncattr('calendar') # read 
calendar type
----> 4 local_time = nc.num2date(t, units=time_unit, calendar=time_cal) # 
convert time
      5 print("Original time %s is now converted as %s" % (time[0], 
local_time[0]))

netCDF4\_netCDF4.pyx in netCDF4._netCDF4.Dataset.__getattr__ 
(netCDF4\_netCDF4.c:20474)()

netCDF4\_netCDF4.pyx in netCDF4._netCDF4.Dataset.getncattr 
(netCDF4\_netCDF4.c:19433)()

netCDF4\_netCDF4.pyx in netCDF4._netCDF4._get_att (netCDF4\_netCDF4.c:4451()

AttributeError: NetCDF: Attribute not found

Any solutions?

Mike Müller · Accepted Answer · 2017-12-19 08:57:34Z

2

nc is your open netCDF file but num2date is located in netCDF4:

>>> import netCDF4
>>> netCDF4.num2date
<function netCDF4._netCDF4.num2date>

Therefore, call it like this:

local_time = netCDF4.num2date(t, units=time_unit, calendar=time_cal)

answered Dec 19, 2017 at 8:57

Mike Müller

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