Dear All,
I am using IDL to produce some netCDF files.
In order to adhere to the COARDS convention I need to supply the
_FillValue attribute.
My data variable is in form of a byte array, with values ranging from 0
to 255.
My valid values go from 0 to 254, and subsequently I want to have both
the _FillValue and the missing_value attributes set to 255.
The problem I am having is that I cannot set the _FillValue to 255.
By running the code attached below (with the different options ->), and
ncdumping -h the resulting netCDF file I always get the _FillValue =
'\377'
So the question is, how can I set (force) the _FillValue attribute to
255 (byte) ?
Thanks for the help.
Best Regards,
Pepe
..............
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lon_id = NCDF_DIMDEF(id, 'longitude', x)
lat_id = NCDF_DIMDEF(id, 'latitude', y)
;Define the variables to be used in the file
longitude_id = NCDF_VARDEF(id, 'longitude', lon_id, /FLOAT)
latitude_id = NCDF_VARDEF(id, 'latitude', lat_id, /FLOAT)
data_id = NCDF_VARDEF(id, 'data', [lon_id, lat_id], /BYTE)
NCDF_ATTPUT, id, chl_id, 'valid_min', '0'
NCDF_ATTPUT, id, chl_id, 'valid_max', '254'
-> NCDF_ATTPUT, id, /BYTE, chl_id, '_FillValue', byte(255)
-> NCDF_ATTPUT, id, chl_id, '_FillValue', byte(255)
NCDF_ATTPUT, id, chl_id, 'missing_value', '255'
;Put the file into data mode
NCDF_CONTROL, id, /ENDEF
;Write the appropriate data to the netCDF file
NCDF_VARPUT, id, longitude_id, longitude
NCDF_VARPUT, id, latitude_id, latitude
NCDF_VARPUT, id, data_id, data
;Close the netCDF file
NCDF_CLOSE, id
END
ncdump-h file.netcdf
.
byte data(latitude, longitude) ;
data:standard_name = "Test" ;
data:long_name = "Test data" ;
data:valid_min = "0" ;
data:valid_max = "254" ;
data:_FillValue = '\377' ;
data:missing_value = "255" ;
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