[ncl-talk] Adding time coordinate

Tue Jan 12 16:17:25 MST 2021

So, in fact what I need is just the hour and minute information, but the easiest way I found was to use the cd_inv_calendar function.
How do you suggest that I can attach this information to the new_data variable?
The purpose of the script is to spatialize the input data to a regular 1km grid.
The input data is just one example of several data in which I use to generate a netcdf file per day with this script.

________________________________
De: Dave Allured - NOAA Affiliate <dave.allured at noaa.gov>
Enviado: terça-feira, 12 de janeiro de 2021 16:39
Para: Vanúcia Schumacher <vanucia-schumacher at hotmail.com>
Cc: ncl-talk at ucar.edu <ncl-talk at ucar.edu>
Assunto: Re: [ncl-talk] Adding time coordinate

Okay.  It looks like your original dates and times are not regularly spaced, and you are trying to make a new set of time coordinates by setting seconds = 0.  This results in more irregular time values with some duplicate values, which are not legal for coordinate subscripting.  This is the error "Non-monotonic coordinate value".

It looks like your input file spans all 24 hours in one day.  Can you please explain exactly what you want the new time coordinates to look like?  Are they regularly spaced or irregular?  Start and end times?

On Tue, Jan 12, 2021 at 4:51 AM Vanúcia Schumacher <vanucia-schumacher at hotmail.com<mailto:vanucia-schumacher at hotmail.com>> wrote:
Using your sugestion:
ntimes = dimsizes(time)
new_data = new((/nlat,mlon,ntimes/),"float")
I got this error:
fatal:NclOneDValGetClosestIndex: Non-monotonic coordinate value being used, can't complete coordinate subscript
fatal:Could not obtain coordinate indexes, unable to perform subscript
fatal:["Execute.c":8640]:Execute: Error occurred at or near line 89 in file test.ncl
The line 89:   new_data({lat(i)},{lon(i)},{time(i)}) = new_data({lat(i)},{lon(i)},{time(i)})+(/var(i)/)

Using this:
ntimes = dimsizes(time(1))
new_data = new((/nlat,mlon,ntimes/),"float")
I got this error:
fatal:Coordinate variables must be the same dimension as their dimension
fatal:No coordinate variable exists for dimension (time) in variable (new_data)
fatal:["Execute.c":8637]:Execute: Error occurred at or near line 86 in file test.ncl
The line 86: new_data&time     = time

Attached is the script and a test data.
Thanks
________________________________
De: Dave Allured - NOAA Affiliate <dave.allured at noaa.gov<mailto:dave.allured at noaa.gov>>
Enviado: segunda-feira, 11 de janeiro de 2021 22:55
Para: Vanúcia Schumacher <vanucia-schumacher at hotmail.com<mailto:vanucia-schumacher at hotmail.com>>
Cc: ncl-talk at ucar.edu<mailto:ncl-talk at ucar.edu> <ncl-talk at ucar.edu<mailto:ncl-talk at ucar.edu>>
Assunto: Re: [ncl-talk] Adding time coordinate

Please show the complete text for line 75, the complete error message, and printVarSummary for the array new_data, just before line 75 is executed.  Also please attach the current version of your script.  Thank you.

On Mon, Jan 11, 2021 at 5:39 PM Vanúcia Schumacher <vanucia-schumacher at hotmail.com<mailto:vanucia-schumacher at hotmail.com>> wrote:
Thanks for the help, but the error persists in the line 75

PrintVarSummary:

Variable: nlat
Type: integer
Total Size: 4 bytes
            1 values
Number of Dimensions: 1
Dimensions and sizes: [1]
Coordinates:

Variable: mlon
Type: integer
Total Size: 4 bytes
            1 values
Number of Dimensions: 1
Dimensions and sizes: [1]
Coordinates:

Variable: ntimes
Type: integer
Total Size: 4 bytes
            1 values
Number of Dimensions: 1
Dimensions and sizes: [1]
Coordinates:
(0) 6024

De: Dave Allured - NOAA Affiliate <dave.allured at noaa.gov<mailto:dave.allured at noaa.gov>>
Enviado: segunda-feira, 11 de janeiro de 2021 20:27
Para: Vanúcia Schumacher <vanucia-schumacher at hotmail.com<mailto:vanucia-schumacher at hotmail.com>>
Cc: ncl-talk at ucar.edu<mailto:ncl-talk at ucar.edu> <ncl-talk at ucar.edu<mailto:ncl-talk at ucar.edu>>
Assunto: Re: [ncl-talk] Adding time coordinate

Your script looks pretty good so far.  This does not look right:
    new_data = new((/nlat,mlon,toint(time(1))/),"float")

Try this:
    ntimes = dimsizes (time)
    new_data = new((/nlat,mlon,ntimes/),"float")

Always use printVarSummary when you are having problems with arrays; and look at dimensions, coordinates, attributes, and such.

Also, in the future, please show the *first* error received, and be sure to show exactly which line it occurs on.  Usually the first error causes more problems later, and it is harder to sort out.  I am not sure what happened this time, but that does not matter now.  Good luck.

On Mon, Jan 11, 2021 at 2:51 PM Vanúcia Schumacher via ncl-talk <ncl-talk at mailman.ucar.edu<mailto:ncl-talk at mailman.ucar.edu>> wrote:
Hi users,

I need to add the time information (preference in hh and mn) extracted from an ascii file to a new variable (new_data from script), but I am not having success.
Attached is the script I am trying using the function cd_inv_calendar and the error obtained:
fatal:No coordinate variable exists for dimension (time) in variable (new_data)

I appreciate some help to attach this information to my new variable
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