opendap and gzipped files #816
Description
Found an issue with opening opendap files that are remotely gzipped - appears that the scipy netCDF backend is used to read gzipped netCDF, but that backend can't do openDAP apparently? Works with local files.
print(ncfiles[0])
ascat=xr.open_dataset(ncfiles[0])
http://opendap.jpl.nasa.gov/opendap/OceanWinds/ascat/preview/L2/metop_a/12km/2013/027/ascat_20130127_004801_metopa_32553_eps_o_125_2101_ovw.l2.nc.gz
---------------------------------------------------------------------------
IOError Traceback (most recent call last)
<ipython-input-35-c5425b003df3> in <module>()
1 print(ncfiles[0])
----> 2 ascat=xr.open_dataset(ncfiles[0])
/data/keeling/a/snesbitt/anaconda2/lib/python2.7/site-packages/xarray/backends/api.pyc in open_dataset(filename_or_obj, group, decode_cf, mask_and_scale, decode_times, concat_characters, decode_coords, engine, chunks, lock, drop_variables)
197 'supported on Python 2.6')
198 try:
--> 199 store = backends.ScipyDataStore(gzip.open(filename_or_obj))
200 except TypeError as e:
201 # TODO: gzipped loading only works with NetCDF3 files.
/data/keeling/a/snesbitt/anaconda2/lib/python2.7/gzip.pyc in open(filename, mode, compresslevel)
32
33 """
---> 34 return GzipFile(filename, mode, compresslevel)
35
36 class GzipFile(io.BufferedIOBase):
/data/keeling/a/snesbitt/anaconda2/lib/python2.7/gzip.pyc in __init__(self, filename, mode, compresslevel, fileobj, mtime)
92 mode += 'b'
93 if fileobj is None:
---> 94 fileobj = self.myfileobj = __builtin__.open(filename, mode or 'rb')
95 if filename is None:
96 # Issue #13781: os.fdopen() creates a fileobj with a bogus name
IOError: [Errno 2] No such file or directory: 'http://opendap.jpl.nasa.gov/opendap/OceanWinds/ascat/preview/L2/metop_a/12km/2013/027/ascat_20130127_004801_metopa_32553_eps_o_125_2101_ovw.l2.nc.gz'