Simone,
It is unclear what you are asking. If you want to write a single
date into a Netcdf file, then I suggest writing a global string
attribute named "date" with a value of, for example, "2007-May-17"
or "2007-05-17". (First form preferred to prevent ambiguity.
Always use four digit years.)
If your file contains a time series, and you want to add a list of
dates to identify the time steps, then I strongly recommend that you
add a numeric time coordinate variable that uses Udunits time
encoding, and follows certain Netcdf standard conventions:
http://www.unidata.ucar.edu/software/udunits/
http://www.unidata.ucar.edu/software/netcdf/conventions.html
I use parts of the COARDS and CF conventions for time coordinates,
with good compatibility for graphics software such as Grads and NCL.
For a brief introduction, see the paragraphs on coordinate systems
and calendar in the Best Practices document:
http://www.unidata.ucar.edu/software/netcdf/docs/BestPractices.html
Here are my minimum recommendations to make a simple time coordinate
variable:
Add a time coordinate array that is type double and one dimensional.
DO NOT use a string array.
Name of time dimension = time
Name of time coordinate variable = time
Minimum attributes:
* units = "days since 1800-1-1 0:0:0"
* calendar = "gregorian"
* long_name = "Time"
It is good to also include the optional actual_range attribute, a
type double array of dimension (2), containing the first and last
values from the time coordinate variable.
This is a basic prototype for you. There are complexities regarding
the data type and attributes that I will not go into unless
needed. I hope this gets you started.
--Dave A.
CU/CIRES Climate Diagnostics Center (CDC)
NOAA/ESRL/PSD, Climate Analysis Branch (CAB)
Simone Marras wrote:
Good morning, I am dealing with a set of *.nc files which do not contain any
date nor information on the time and, for what I need to do with those files,
I actually need to add the DATE as YY-MM-DD in the files.
Has anyone ever gone through this?
I hope someone can help me with this
Thank you in advance,
Regards
Simone
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