Subject:
problem with netCDF4 OpenDAP
From:
Tom P <werot...@freent.dd>
Date:
08/13/2015 10:32 AM
To:
python-list@python.org
I'm having a problem trying to access OpenDAP files using netCDF4.
The netCDF4 is installed from the Anaconda package. According to their
changelog, openDAP is supposed to be supported.
netCDF4.__version__
Out[7]:
'1.1.8'
Here's some code:
url =
'http://www1.ncdc.noaa.gov/pub/data/cmb/ersst/v3b/netcdf/ersst.201507.nc'
nc = netCDF4.Dataset(url)
I get the error -
netCDF4/_netCDF4.pyx in netCDF4._netCDF4.Dataset.__init__
(netCDF4/_netCDF4.c:9551)()
RuntimeError: NetCDF: file not found
However if I download the same file, it works -
url = '/home/tom/Downloads/ersst.201507.nc'
nc = netCDF4.Dataset(url)
print nc
. . . .
Is it something I'm doing wrong?
Same thing here:
(devenv-3.4.1) dilbert@gtrojan> python
Python 3.4.1 (default, Jul 7 2014, 15:47:25)
[GCC 4.8.3 20140624 (Red Hat 4.8.3-1)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import netCDF4
>>> url =
'http://www1.ncdc.noaa.gov/pub/data/cmb/ersst/v3b/netcdf/ersst.201507.nc'
>>> nc = netCDF4.Dataset(url)
syntax error, unexpected WORD_WORD, expecting SCAN_ATTR or SCAN_DATASET
or SCAN_ERROR
context: <!DOCTYPE^ HTML PUBLIC "-//IETF//DTD HTML
2.0//EN"><html><head><title>404 Not Found</title></head><body><h1>Not
Found</h1><p>The requested URL
/pub/data/cmb/ersst/v3b/netcdf/ersst.201507.nc.dds was not found on this
server.</p></body></html>
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "netCDF4.pyx", line 1466, in netCDF4.Dataset.__init__
(netCDF4.c:19738)
RuntimeError: NetCDF: file not found
>>>
It looks like NCDC does not support OpeNDAP (note the .dds extension in
the error message). It is not a Python/netCDF4 issue.
(devenv-3.4.1) dilbert@gtrojan> ncdump -h
http://www1.ncdc.noaa.gov/pub/data/cmb/ersst/v3b/netcdf/ersst.201507.nc
syntax error, unexpected WORD_WORD, expecting SCAN_ATTR or SCAN_DATASET
or SCAN_ERROR
context: <!DOCTYPE^ HTML PUBLIC "-//IETF//DTD HTML
2.0//EN"><html><head><title>404 Not Found</title></head><body><h1>Not
Found</h1><p>The requested URL
/pub/data/cmb/ersst/v3b/netcdf/ersst.201507.nc.dds was not found on this
server.</p></body></html>
ncdump:
http://www1.ncdc.noaa.gov/pub/data/cmb/ersst/v3b/netcdf/ersst.201507.nc:
NetCDF: file not found
George
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