On Thu, May 28, 2020 at 4:17 PM Alexander Audet <alexander.c.audet@xxxxxxxxx> wrote:
Ansley,I got my time axis on, thank you! I remember having this issue before and for some reason I never found that little section of the user manual! However, my broader problem is apparently not solved by this. Namely, when I input my variable into Vapor, it does not recognize any variables/data (though there are no error messages). I have two other thoughts of what may be causing this that I am having trouble troubleshooting by myself. (Perhaps though I should explain this problem in a new post?)My variables act strangely when I try to add them to a new file, requiring me to append them instead. I outlined this at the end of my first post.Secondly, I am worried about how my file is recording the missing values. For example when I accidently did a ncdump and listed the file contents instead of its attributes, I noticed missing values did not have one of the values specified as either the missing_value = -1.e+34 ; or FillValue = -1.e+34. Instead it has this:I have tried using some of the tips in 3.1.6.3 & 4 without success.Basically, I am just going through NetCDF and the CF Conventions on the Vapor website to troubleshoot what could be wrong.Regards,Alexander AudetOn Wed, May 27, 2020 at 8:29 PM Ansley C. Manke <ansley.b.manke@xxxxxxxx> wrote:Hi Alexander,
Just a quick answer to your first question: Adding a "timestamp" to a
grid that doesn't have a time axis. You'll define a zero-valued
variable that has a one-point time axis with the time value that you
want, and add it to the variable that doesn't have time.
https://ferret.pmel.noaa.gov/Ferret/documentation/users-guide/commands-reference/SAVE#timestamp
(By the way, look up "time" in the *Users Guide index
<https://ferret.pmel.noaa.gov/Ferret/documentation/users-guide/index-1/index>*;
there's an entry "*create time axis when var has none (timestamp)
<https://ferret.pmel.noaa.gov/Ferret/documentation/users-guide/commands-reference/SAVE#timestamp>***).
Make sure you give your new variable the right title and units, etc.
This uses the Ferret/Pyferret concept of "conformability" which are the
rules used to combine variables with different dimensionality -- again
have a look in the Users Guide index for the word conformability or
conformable. I'm not criticizing you for not finding these things, just
pointing out some good ways to hunt.
These will get you started. I haven't studied the rest of what you've
written, but write back if you have more questions.
-Ansley
On 5/27/2020 4:37 PM, Alexander Audet wrote:
> Ferret community,
> My main question is how to add a
> time-axis to a file without one. Regridding the file on a grid with a
> single time point does not seem to work.
>
> Original variable:
> image.png
>
> This is my grid:
> image.png
> *Let PascalVAPOUR = VarMonth[g=fullVAPOUR, gt=@ASN]*
>
> And here is my regridded variable.
> image.png
> (Ignore my pascal labeling, I first experimented with changing those
> units then abandoned that without switching the labels)
>
> Here is some background as to what I am actually trying to do:
> I have a netcdf file that is the result
> of a correlation analysis that I am trying to view in VAPOUR (a 3D
> display software). Currently, I have taken the correlation results I
> have calculated for each pressure level and appended them into a file
> with a vertical axis. However because the results are a correlation of
> two time series, the file does not have a T axis as is appropriate.
> However, when I place my completed file into VAPOUR, VAPOUR does not
> read it.
> It seems to me that not having a time
> axis might be part of the problem. (See netcdf & cf conventions
> <https://www.docs.vapor.ucar.edu/gettingDataIntoVapor.html> on the
> VAPOUR page).
>
> On a side note, (it might be part of the
> overall problem) whenever I add the variables I am using to the NC
> files I output,
>
> *SAVE/clobber/FILE=VerticalWindSpeedNZCorrel_VAPOUR2.nc PascalVAPOUR*
>
> it give me this message:
>
> ***TMAP ERR: attempt to redefine line
> axis AX006YY of grid for PASCALVAPOUR doesn't match CDF file*
>
> However, I can then successfully add the variable to the file with the
> append function after it has been created.
>
> *SAVE/append/FILE=VerticalWindSpeedNZCorrel_VAPOUR2.nc PascalVAPOUR
> LISTing to file VerticalWindSpeedNZCorrel_VAPOUR2.nc*
>
> This also happened when I was originally constructing my vertical file
> from each horizontal level. The first time I clobbered and created the
> file, it gave me the identical t-map error and I had to re-append the
> variable. After the file was created though, I could append each
> pressure level without issue.
>
> Alexander Audet
--
Ansley Manke
Science Data Integration Group
NOAA Pacific Marine Environmental Laboratory
7600 Sand Point Way NE
Seattle WA 98115
I am currently teleworking and am available Tue-Wed-Thu.
