"nan" is not supported in NCL but more and more dataset make nan as fillvalue #217
Description
Describe the bug
Recently, I found that the era5 dataset is different from the old CDS.
The new website to download. (https://cds-beta.climate.copernicus.eu/)
- The dataset's fillvalue is 'nan' , and NCL cannot recognize this fill value. Everytime I need to use the 'where' function to take it place to 9.96921e+36 or other fillvalue NCL supported. This problem also happends in the output data from python.
- The type of 'time' dimension is int64, which is not supported in cd_calendar function.
ERA5 dataset is a dataset that we commonly use. I hope the official team can resolve the issue to facilitate the use of the datasets. Thanks!
Provide the following:
- a concise NCL script demonstrating the issue (remove unnecessary code)
- necessary data files
- relevant graphical output
The code I used to deal with,
; ----take place the fillvalue
u@_FillValue = 9.96921e+36
u = where(u.eq."nan", u@_FillValue, false_value)
; ----change the time type to integer not int64
time0 = f->valid_time
time = toint(time0)
copy_VarMeta(time0, time)
; printVarSummary(time)
timeARR = cd_calendar(time, 3)
Computing environment
- OS: [Linux, Mac, or Windows]
- OS version: [e.g. Ubuntu 16.04, MacOS 10.13.6, Windows 10]
- NCL Version: [e.g. 6.5.0]
- Installation method: [binary from NCAR website, conda, other package manager (apt, brew, macports, yum), built from source]
Additional context
Add any other context about the problem here.