Fix Hamtide

[SorooshMani-NOAA]

It seems that the updated netCDF4 package cannot work with the OPeNDAP link

[SorooshMani-NOAA]

Pinning numpy to <2 and netCDF4 to <1.7 will resolve the issue:

In [1]: from netCDF4 import Dataset

In [2]: Dataset('https://icdc.cen.uni-hamburg.de/thredds/dodsC/ftpthredds/hamtide/k2.hamtide11a.nc')
Error:curl error: Problem with the SSL CA cert (path? access rights?)
curl error details:
Warning:oc_open: Could not read url
---------------------------------------------------------------------------
OSError                                   Traceback (most recent call last)
Cell In[2], line 1
----> 1 Dataset('https://icdc.cen.uni-hamburg.de/thredds/dodsC/ftpthredds/hamtide/k2.hamtide11a.nc')

File src/netCDF4/_netCDF4.pyx:2470, in netCDF4._netCDF4.Dataset.__init__()

File src/netCDF4/_netCDF4.pyx:2107, in netCDF4._netCDF4._ensure_nc_success()

OSError: [Errno -68] NetCDF: I/O failure: 'https://icdc.cen.uni-hamburg.de/thredds/dodsC/ftpthredds/hamtide/k2.hamtide11a.nc' 

Ideally we should try to resolve this without the need to pin packages!

[SorooshMani-NOAA]

It's obvious, but just for the sake of completeness, if I try to read opendap netcdf through the xarray it fails with version 1.7 and up.

Note that the version of numpy above was required due to compatibility issue with netCDF-python. It seems numpy==2 doesn't work with older versions of netCDF4 (<1.7)!

In [1]: from netCDF4 import Dataset
---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
Cell In[1], line 1
----> 1 from netCDF4 import Dataset

File ~/miniconda3/envs/adcircpy/lib/python3.10/site-packages/netCDF4/__init__.py:3
      1 # init for netCDF4. package
      2 # Docstring comes from extension module _netCDF4.
----> 3 from ._netCDF4 import *
      4 # Need explicit imports for names beginning with underscores
      5 from ._netCDF4 import __doc__

File src/netCDF4/_netCDF4.pyx:1, in init netCDF4._netCDF4()

ValueError: numpy.dtype size changed, may indicate binary incompatibility. Expected 96 from C header, got 88 from PyObject

[SorooshMani-NOAA]

If I install netCDF4 python package using conda/mamba I won't run into the original issue with Hamtide; I can read the URL. Maybe we need to just find the right way to install it using PIP, or just pin the version in the CI tests installation

[SorooshMani-NOAA]

This seems to be the solution! https://github.com/Unidata/netcdf4-python/issues/1179#issuecomment-1205668023

We need to install the netcdf library by rebuilding:

python -m pip install --upgrade --force-reinstall --no-deps --no-cache-dir netcdf4 --no-binary netcdf4