Error reading .nc4 file: 'Unknown file format (NC_ENOTNC)'

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juan ignacio gossn
juan ignacio gossn 2016-11-25
评论： Rimal Abeed 2020-1-7
Hi there,
Am trying to read a .nc4 file using ncread('filename') and get:
>> ncread('S3A_OL_SRF_20160713_mean_rsr.nc4')
Error using netcdflib
The NetCDF library encountered an error during execution of 'open' function -
'Unknown file format (NC_ENOTNC)'.
Error in netcdf.open (line 60)
[varargout{:}] = netcdflib ( 'open', filename, varargin{1} );
Error in internal.matlab.imagesci.nc/openToRead (line 1249)
this.ncRootid = netcdf.open(this.Filename,'NOWRITE');
Error in internal.matlab.imagesci.nc (line 122)
this.openToRead();
Error in ncread (line 54)
ncObj = internal.matlab.imagesci.nc(ncFile);
Any suggestion will be kindly appreciated
Thanks,
Juancho

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回答（3 个）

Tamir Suliman
Tamir Suliman 2016-11-25
It might be corrupted file or over written try to re copy it again that's the message one gets if the file is not there with the netCDF functions.
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juan ignacio gossn
juan ignacio gossn 2016-11-27
Thanks Tamir for your reply, I tried downloading it again and used different versions of matlab but it continues to throw the same message
Juan

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Walter Roberson
Walter Roberson 2016-11-25
Check the first few bytes of the file. If they are 'CDF' then it might be a valid netCDF file but it would not be a NetCDF-4 file. NetCDF-4 files are HDF5 files. If it is NetCDF-4 stored as HDF5, then the file should begin with
Hex: 89 48 44 46 0d 0a 1a 0a
ASCII: \211 HDF \r \n \032 \n
  2 个评论
juan ignacio gossn
juan ignacio gossn 2016-11-27
编辑：Walter Roberson 2016-11-27
Thanks Walter for your reply, the first bytes are completely different from what you state:
<!DOCTYPE html><html lang="en" xmlns:fb="http://ogp.me/ns/fb#" xml:lang="en" class="" xmlns="http://www.w3.org/1999/xhtml">
though its termination is clearly .nc4 .... :S
Walter Roberson
Walter Roberson 2016-11-27
http://stackoverflow.com/questions/11344185/what-kind-of-code-is-http-ogp-me-ns-fb
It appears that is related to JSON and to Facebook's OpenGraph protocol.
Possibly there is NetCDF-4 represented in the content, but the data structure itself is not NetCDF-4

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juan ignacio gossn
juan ignacio gossn 2016-12-21
Thank you, sorry for my late reply. Actually the file was corrupted, so, nothing to do with Matlab.
Thanks a lot!
Juancho

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