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  • "[Errno -90] NetCDF: file not found: b" when opening netCDF from server · 4 ✖

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832712426 https://github.com/pydata/xarray/issues/3653#issuecomment-832712426 https://api.github.com/repos/pydata/xarray/issues/3653 MDEyOklzc3VlQ29tbWVudDgzMjcxMjQyNg== rabernat 1197350 2021-05-05T14:01:25Z 2021-05-05T14:01:33Z MEMBER

Update: there is now a way to read a remote netCDF file from an HTTP server directly using the netcdf-python library. The trick is to append #mode=bytes to the end of the url.

```python import xarray as xr import netCDF4 # I'm using version 1.5.6

url = "https://www.ldeo.columbia.edu/~rpa/NOAA_NCDC_ERSST_v3b_SST.nc#mode=bytes"

raw netcdf4 Dataset

ds = netCDF4.Dataset(url)

xarray Dataset

ds = xr.open_dataset(url) ```

 
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   "[Errno -90] NetCDF: file not found: b" when opening netCDF from server 543197350
570163736 https://github.com/pydata/xarray/issues/3653#issuecomment-570163736 https://api.github.com/repos/pydata/xarray/issues/3653 MDEyOklzc3VlQ29tbWVudDU3MDE2MzczNg== rabernat 1197350 2020-01-02T10:05:54Z 2020-01-02T10:05:54Z MEMBER

More concise syntax for the same thing

```python import xarray as xr import fsspec

url = 'https://www.ldeo.columbia.edu/~rpa/NOAA_NCDC_ERSST_v3b_SST.nc' with fsspec.open(url) as fobj: ds = xr.open_dataset(fobj) print(ds) ```

 
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   "[Errno -90] NetCDF: file not found: b" when opening netCDF from server 543197350
570156277 https://github.com/pydata/xarray/issues/3653#issuecomment-570156277 https://api.github.com/repos/pydata/xarray/issues/3653 MDEyOklzc3VlQ29tbWVudDU3MDE1NjI3Nw== rabernat 1197350 2020-01-02T09:34:58Z 2020-01-02T09:34:58Z MEMBER

Xarray does not appear to be able to open netCDF from a url without a THREADS serve

This is not a limitation of xarray per se, but of the netcdf4-python library itself.

You can, however, get around this limitation by using fsspec.

```python import xarray as xr from fsspec.implementations.http import HTTPFileSystem

your Azure URL is not publicly accessible, so I used another one

url = 'https://www.ldeo.columbia.edu/~rpa/NOAA_NCDC_ERSST_v3b_SST.nc' fs = HTTPFileSystem() fobj = fs.open(url) ds = xr.open_dataset(fobj) ds ```

This will not be very performant, but it will work.

 
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   "[Errno -90] NetCDF: file not found: b" when opening netCDF from server 543197350
570088451 https://github.com/pydata/xarray/issues/3653#issuecomment-570088451 https://api.github.com/repos/pydata/xarray/issues/3653 MDEyOklzc3VlQ29tbWVudDU3MDA4ODQ1MQ== rabernat 1197350 2020-01-01T22:23:53Z 2020-01-01T22:23:53Z MEMBER

Does it work if you opens the url directly with netcdf4, bypassing xarray? If not, then it’s a netcdf4 or thredds problem.

On Jan 1, 2020, at 10:44 PM, Dax Soule notifications@github.com wrote:

 Reopened #3653.

— You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub, or unsubscribe.

 
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   "[Errno -90] NetCDF: file not found: b" when opening netCDF from server 543197350

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