[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[netCDF #WOK-766024]: variables violate format constraints error

> Hi, I don't know if this is the right place or if you can help at all...
> I am running a fairly standard large atmospheric program (CMAQ), which has
> run fine many times, but is now crashing with a netCDF-related error
> message:
> ncendef:      Error putting netCDF file into data mode.
> netCDF error number  -62  processing file "S_CGRID"
> NetCDF: One or more variable sizes violate format constraints
> This is using Portland Group Fortran.
> Output files are very large, but the program run successfully wrote a 60-GB
> output.
> The file that causes it to crash has the following dimensions:
> 255 x 50 x 218 x236    (= 655,962,000)
> Is there any way to modify netCDF to prevent this error? (Allow larger
> limits, etc.)?
> Since this is a 'canned' program, it will be very hard to change the code.
> Please let me know if anything can be done about this.
> Sandy Sillman  769-0359
> -----------------------------------------------------
> Sanford Sillman  (Sandy)
> Department of Atmospheric, Oceanic and Space Sciences
> 2455 Hayward Street, Room 1541C SRB
> University of Michigan, Ann Arbor MI 48109-2143 (USA)
> PHONE:  734-763-4217       FAX: 734-936-0503 (best)  or 734-764-4585
> E-MAIL:  address@hidden
> WEB SITE:  http://www-personal.umich.edu/~sillman
> -----------------------------------------------------

Have you recently increased your resolution?

The error that you are getting indicates that you are trying to create a 
variable that does not fit in the constraints of the classic netCDF format (see 

The answer is to switch to a different netCDF format. (This is transparent to 
reading programs, as long as they have a recent enough version of the netCDF 
library.) The different binary formats are explained here: 

To change the format you must find the nf_create call and change the cmode 
flag. For more info see: 

Good luck,


Ticket Details
Ticket ID: WOK-766024
Department: Support netCDF
Priority: Critical
Status: Closed

NOTE: All email exchanges with Unidata User Support are recorded in the Unidata inquiry tracking system and then made publicly available through the web. If you do not want to have your interactions made available in this way, you must let us know in each email you send to us.