issues: 616025171

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id node_id number title user state locked assignee milestone comments created_at updated_at closed_at author_association active_lock_reason draft pull_request body reactions performed_via_github_app state_reason repo type
616025171 MDU6SXNzdWU2MTYwMjUxNzE= 4052 Opendap access problem when subsetting via latitude and longitude... 13906519 open 0     1 2020-05-11T16:44:02Z 2022-04-29T00:37:51Z   NONE      

I am trying to access a subset of a netcdf files hosted on a THREDDS server. I can inspect the metadata, but I cannot subset the file via lat and lon slices. A download via the http link provided on the page works...

MCVE Code Sample

```python import xarray as xr

this works

test1 = xr.open_dataset(URL) display(test1)

this also works

test2 = xr.open_dataset(URL).sel(lat=slice(30,40)) display(test2)

this also works

test3 = xr.open_dataset(URL).sel(lon=slice(100,110)) display(test3)

this fails

test4 = xr.open_dataset(URL).sel(lat=slice(30,40), lon=slice(100,110)) display(test4)

```

Problem Description

Error: ``` ~/.pyenv/versions/miniconda3-latest/envs/datascience/lib/python3.7/site-packages/xarray/backends/common.py in robust_getitem(array, key, catch, max_retries, initial_delay) 52 for n in range(max_retries + 1): 53 try: ---> 54 return array[key] 55 except catch: 56 if n == max_retries:

netCDF4/_netCDF4.pyx in netCDF4._netCDF4.Variable.getitem()

netCDF4/_netCDF4.pyx in netCDF4._netCDF4.Variable._get()

netCDF4/_netCDF4.pyx in netCDF4._netCDF4._ensure_nc_success()

RuntimeError: NetCDF: Access failure ```

I also tried to use the pydap engine, but I'm not sure if this tells me something about the problem or if I use this option incorrectly...

```python

URL = "https://thredds.daac.ornl.gov/thredds/dodsC/ornldaac/1247/T_CLAY.nc4" test1 = xr.open_dataset(URL, engine='pydap') test1

```

result: UnicodeDecodeError: 'ascii' codec can't decode byte 0x8b in position 1: ordinal not in range(128)

Versions

``` INSTALLED VERSIONS

commit: None python: 3.7.4 (default, Aug 13 2019, 15:17:50) [Clang 4.0.1 (tags/RELEASE_401/final)] python-bits: 64 OS: Darwin OS-release: 19.5.0 machine: x86_64 processor: i386 byteorder: little LC_ALL: en_US.UTF-8 LANG: en_US.UTF-8 LOCALE: en_US.UTF-8 libhdf5: 1.10.4 libnetcdf: 4.6.1

xarray: 0.15.1 pandas: 1.0.1 numpy: 1.18.1 scipy: 1.4.1 netCDF4: 1.4.2 pydap: installed h5netcdf: None h5py: None Nio: None zarr: 2.4.0 cftime: 1.0.4.2 nc_time_axis: None PseudoNetCDF: None rasterio: 1.0.21 cfgrib: None iris: None bottleneck: None dask: 2.11.0 distributed: 2.11.0 matplotlib: 3.1.3 cartopy: 0.17.0 seaborn: 0.10.0 numbagg: None setuptools: 45.2.0.post20200210 pip: 20.0.2 conda: None pytest: None IPython: 7.12.0 sphinx: None ```

 
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     13221727 issue

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