Thread: More Stations service problems

Hi John-

KY has little in the way of BH and HH channels, which you can see in this
query:


http://service.iris.edu/fdsnws/station/1/query?network=KY&format=text&level=channel

In fact, if you apply a channel filter to look for just those types, you
will only find HH channels for CUSSO, so that will be all you can hope to
extract. We can look at the time extent for data availability here:


http://service.iris.edu/fdsnws/availability/1/extent?network=KY&format=text&cha=HH*

Aside from only seeing three channels, you should be able to get data from
them. We have still not sorted out why we get this error via ObsPy, but we
think that something built into the ObsPy client is expecting a Gzipped
return and getting something else instead. This could be a mis-marked
content type header from the sending service. It's possible that what is
being sent back is some kind of error message, but I don't recall that we
have that content figured out.

We have seen this problem before with some of our internal routines, and
it specifically points to ObsPy and its current interaction with our
station service. It's still on our problem list.

Have you tried different time lengths with this specific query, or
narrowed it to individual channels? Sorry that I don't have a definitive
answer for this one. We'll try to solve it when we can spare people cycles.

-Rob


On Jan 28, 2023, at 10:46 AM, John West (via IRIS) <
webservices-bounce<at>lists.ds.iris.edu> wrote:

Hi! I'm using Obspy to call the stations web service to get BH* and HH*
channels for a given network and 2-hour time window. Code snippet:
Channels = DCclient.get_stations(startbefore=FileStart, endafter=FileEnd,
network=N.code, channel=CHANNELS, level='channel')

I get the following error:
could not retrieve channels for datacenter IRIS: KY Not a gzipped file
(b'a\r') Traceback (most recent call last): File
"/home/adept/code/Channels.py", line 213, in FDSNchannels Channels =
DCclient.get_stations(startbefore=FileStart, endafter=FileEnd, File
"/usr/local/lib/python3.8/dist-packages/obspy/clients/fdsn/client.py", line
725, in get_stations data_stream = self._download(url) File
"/usr/local/lib/python3.8/dist-packages/obspy/clients/fdsn/client.py", line
1393, in _download code, data = download_url( File
"/usr/local/lib/python3.8/dist-packages/obspy/clients/fdsn/client.py", line
1819, in download_url data = io.BytesIO(f.read()) File
"/usr/lib/python3.8/gzip.py", line 292, in read return
self._buffer.read(size) File "/usr/lib/python3.8/gzip.py", line 479, in
read if not self._read_gzip_header(): File "/usr/lib/python3.8/gzip.py",
line 427, in _read_gzip_header raise BadGzipFile('Not a gzipped file (%r)'
% magic) gzip.BadGzipFile: Not a gzipped file (b'a\r')

I don't know if this is related to the issue reported by Philip Crotwell
last week. The code works with other data centers, and used to work with
the IRIS service.

Thanks!
-- John

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