using obspy.arclink.client

Users Mailing List Archive
1

Dear all,

I’m trying to get waveform data by using obspy.arclink from our internal seiscomp sever.

The scart works with this sever as follows. So I think our arclink sever is running fine.
seiscomp exec scart -s -I arclink://mulberry.jamstec.go.jp:18001 --list test1.txt --stdout > tmp.ms

The example script given for the obspy.arclink on the web page also works (http://docs.obspy.org/packages/autogen/obspy.arclink.client.Client.getWaveform.html).
So I guess obspy is also running fine.

However, when I try to use obspy.arclink to get the data from our server, it does not work.
With the following script,

2

Dear Akiko,

try running the client in debug mode to get more information

client = Client(host='...',port=18001,user='ttest', debug=True)
st = client.getWaveform("PS","KI05","","HHZ", t - 3, t + 15)

Personally I never managed to get a status "CANCELLED" from an ArcLink
server so I have no clue what could be the issue - also the docs
(Seiscomp3 Development) only mention
the status "CANCEL" ...

For server issue try to ask the SeisComP support
(Seiscomp3 Development) or the EIDA mailinglist
(eida_maint@gfz-potsdam.de).

Hope it help,
Robert

Dear all,

I'm trying to get waveform data by using obspy.arclink from our
internal seiscomp sever.

The scart works with this sever as follows. So I think our arclink
sever is running fine. seiscomp exec scart -s -I
arclink://mulberry.jamstec.go.jp:18001 --list test1.txt --stdout >
tmp.ms

The example script given for the obspy.arclink on the web page
also works
(http://docs.obspy.org/packages/autogen/obspy.arclink.client.Client.getWaveform.html).
So I guess obspy is also running fine.

However, when I try to use obspy.arclink to get the data from our
server, it does not work. With the following script, ====== from
obspy import UTCDateTime from obspy.arclink.client import Client
client =
Client(host='mulberry.jamstec.go.jp',port=18001,user='ttest') t =
UTCDateTime("2009-03-20 04:03:12") st =
client.getWaveform("PS","KI05","","HHZ", t - 3, t + 15) st.plot()

I get the following error.

======= Traceback (most recent call last): File "plot_PS_KI.py",
line 6, in <module> st = client.getWaveform("PS","KI05","","HHZ", t
- 3, t + 15) File
"/usr/lib/python2.7/dist-packages/obspy/arclink/client.py", line
426, in getWaveform compressed=compressed, route=route) File
"/usr/lib/python2.7/dist-packages/obspy/arclink/client.py", line
545, in saveWaveform data = self._fetch(rtype, rdata, route=route)
File "/usr/lib/python2.7/dist-packages/obspy/arclink/client.py",
line 211, in _fetch endtime=request_data[1]) File
"/usr/lib/python2.7/dist-packages/obspy/arclink/client.py", line
601, in getRouting result = self._fetch(rtype, rdata, route=False)
File "/usr/lib/python2.7/dist-packages/obspy/arclink/client.py",
line 205, in _fetch return self._request(request_type,
request_data) File
"/usr/lib/python2.7/dist-packages/obspy/arclink/client.py", line
309, in _request raise ArcLinkException("%s %s" % (err_code, msg))
obspy.arclink.client.ArcLinkException: CANCELLED =======

I just wonder if there are any parameters on the arclink sever,
which should be set up to use the obspy.arclink. Maybe I should
allow the user "ttest" to access the data on the arclink sever ? I
would appreciate it if someone who is experienced both in
seiscomp3 and obspy could help me.

Regards, Akiko To

_______________________________________________ obspy-users mailing
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- --
Dr. Robert Barsch

EGU Office Munich
Luisenstr. 37
80333 Munich
Germany

Phone: +49-89-21806565
Fax: +49-89-218017855
eMail: barsch@egu.eu

3

As an alternative option to get data from a seicomp instance.. in case
you have the FDSN web service enabled you can also access data from your
seiscomp using the obspy.fdsn client.

E.g. if you have a fdsn web service at the default URL on your instance
at http://mulberry.jamstec.go.jp:8080/fdsnws then you could..

from obspy.fdsn import Client
client = Client("http://mulberry.jamstec.go.jp:8080")
st = client.get_waveforms(....)

best,
Tobias

4

Dear Robert and Tobias,

Thank you very much for the reply.
I run the client in debug mode, but so far I'm not sure how to fix the problem.
I'd like to also try to ask to the SC3 support and EIDA mailinglist.

Thank you for the information.
Regards,
Akiko To

5

Hi Akiko,

looks like you're request gets stuck during a routing query before the
actual data query. You should deactivate routing, as you only query one
specific ArcLink node and not a network of linked nodes.

Try to set `route=False` for any requests that have a `route` kwarg.

hope it helps,
Tobias

6

Dear Tobias,

Thank you very much for the reply.

It worked by setting `route=False`.

Thanks a lot.
Regards,
Akiko To