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__init__.py
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__init__.py
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# -*- coding: utf-8 -*-
"""
obspy.clients.arclink - ArcLink/WebDC request client for ObsPy
==============================================================
ArcLink is a distributed data request protocol usable to access archived
waveform data in the MiniSEED or SEED format and associated meta information as
Dataless SEED files. It has been originally founded within the German WebDC
initiative of GEOFON_ (Geoforschungsnetz) and BGR_ (Bundesanstalt für
Geowissenschaften und Rohstoffe). ArcLink has been designed as a "straight
consequent continuation" of the NetDC concept originally developed by the IRIS_
DMC. Instead of requiring waveform data via E-mail or FTP requests, ArcLink
offers a direct TCP/IP communication approach. A prototypic web-based request
tool is available via the WebDC homepage at http://www.webdc.eu.
Recent development efforts within the NERIES_ (Network of Excellence of
Research and Infrastructures for European Seismology) project focuses on
extending the ArcLink network to all major seismic data centers within Europe
in order to create an European Integrated Data Center (EIDAC). Currently
(September 2009) there are four European data centers contributing to this
network: ORFEUS_, GFZ_ (GeoForschungsZentrum), INGV_ (Istituto Nazionale di
Geofisica e Vulcanologia), and IPGP_ (Institut de Physique du Globe de Paris).
:copyright:
The ObsPy Development Team (devs@obspy.org)
:license:
GNU Lesser General Public License, Version 3
(https://www.gnu.org/copyleft/lesser.html)
Basic Usage
-----------
.. note::
The default client needs to open port 18002 to the host webdc.eu via TCP/IP
in order to download the requested data. Please make sure that no firewall
is blocking access to this server/port combination.
.. note::
The ``user`` keyword in the following examples is used for identification
with the ArcLink server as well as for usage statistics within the data
center, so please provide a meaningful user id such as an email address.
(1) :meth:`~obspy.clients.arclink.client.Client.get_waveforms()`: The following
example illustrates how to request and plot 18 seconds of all three single
band channels (``"EH*"``) of station Jochberg/Hochstaufen (``"RJOB"``)
of the Bavarian network (``"BW"``) for an seismic event around
2009-08-20 04:03:12 (UTC).
>>> from obspy import UTCDateTime
>>> from obspy.clients.arclink.client import Client
>>> client = Client(user='test@obspy.org')
>>> t = UTCDateTime("2009-08-20 04:03:12")
>>> st = client.get_waveforms("BW", "RJOB", "", "EH*", t - 3, t + 15)
>>> st.plot() # doctest: +SKIP
Waveform data fetched from an ArcLink node is converted into an ObsPy
:class:`~obspy.core.stream.Stream` object. The seismogram is truncated by
the ObsPy client to the actual requested time span, as ArcLink internally
cuts SEED files for performance reasons on record base in order to avoid
uncompressing the waveform data. The output of the script above is shown in
the next picture.
.. plot::
from obspy import UTCDateTime
from obspy.clients.arclink.client import Client
client = Client(user='test@obspy.org')
t = UTCDateTime("2009-08-20 04:03:12")
st = client.get_waveforms("BW", "RJOB", "", "EH*", t - 3, t + 15)
st.plot() # doctest: +SKIP
(2) :meth:`~obspy.clients.arclink.client.Client.get_paz()`: Requests poles,
zeros, gain and sensitivity of a single channel at a given time.
>>> from obspy import UTCDateTime
>>> from obspy.clients.arclink.client import Client
>>> client = Client(user='test@obspy.org')
>>> dt = UTCDateTime(2009, 1, 1)
>>> paz = client.get_paz('BW', 'MANZ', '', 'EHZ', dt)
>>> paz # doctest: +NORMALIZE_WHITESPACE +SKIP
AttribDict({'poles': [(-0.037004+0.037016j), (-0.037004-0.037016j),
(-251.33+0j), (-131.04-467.29j), (-131.04+467.29j)],
'sensitivity': 2516778600.0,
'zeros': [0j, 0j],
'name': 'LMU:STS-2/N/g=1500',
'gain': 60077000.0})
(3) :meth:`~obspy.clients.arclink.client.Client.save_response()`: Writes
response information into a file.
>>> from obspy import UTCDateTime
>>> from obspy.clients.arclink.client import Client
>>> client = Client(user='test@obspy.org')
>>> t = UTCDateTime(2009, 1, 1)
>>> client.save_response('BW.MANZ..EHZ.dataless', 'BW', 'MANZ', '', '*',
... t, t + 1, format="SEED") # doctest: +SKIP
(4) :meth:`~obspy.clients.arclink.client.Client.save_waveforms()`: Writes the
requested waveform unmodified into your local file system. Here we request
a Full SEED volume.
>>> from obspy import UTCDateTime
>>> from obspy.clients.arclink.client import Client
>>> client = Client(user='test@obspy.org')
>>> t = UTCDateTime(2009, 1, 1, 12, 0)
>>> client.save_waveforms('BW.MANZ..EHZ.seed', 'BW', 'MANZ', '', '*',
... t, t + 20, format='FSEED') # doctest: +SKIP
(5) :meth:`~obspy.clients.arclink.client.Client.get_inventory()`: Request
inventory data.
>>> from obspy import UTCDateTime
>>> from obspy.clients.arclink.client import Client
>>> client = Client(user='test@obspy.org')
>>> inv = client.get_inventory('BW', 'M*', '*', 'EHZ', restricted=False,
... permanent=True, min_longitude=12,
... max_longitude=12.2) #doctest: +SKIP
>>> inv.keys() # doctest: +SKIP
['BW.MROB', 'BW.MANZ..EHZ', 'BW', 'BW.MANZ', 'BW.MROB..EHZ']
>>> inv['BW'] # doctest: +SKIP
AttribDict({'description': 'BayernNetz', 'region': 'Germany', ...
>>> inv['BW.MROB'] # doctest: +SKIP
AttribDict({'code': 'MROB', 'description': 'Rosenbuehl, Bavaria', ...
Further Resources
-----------------
* ArcLink protocol specifications:
* https://www.seiscomp3.org/wiki/doc/applications/arclink
* http://geofon.gfz-potsdam.de/_sc3_neries_/arclink.pdf
* https://raw.github.com/obspy/obspy/master/obspy/clients/arclink/docs/\
protocol.txt
* `Short introduction <http://www.webdc.eu/arclink/help.html>`_ to the ArcLink
protocol
* Latest `ArcLink server
<ftp://ftp.gfz-potsdam.de/pub/home/st/GEOFON/software/SeisComP/ArcLink/>`_
* `SeismoLink <http://neriesdataportalblog.freeflux.net/webservices/>`_: a SOAP
Web service on top of the ArcLink network
.. _GEOFON:
http://geofon.gfz-potsdam.de
.. _BGR:
https://www.bgr.de
.. _IRIS:
https://www.iris.edu/hq/
.. _NERIES:
http://www.neries-eu.org
.. _INGV:
http://www.ingv.it
.. _ORFEUS:
http://www.orfeus-eu.org
.. _GFZ:
http://www.gfz-potsdam.de
.. _IPGP:
http://www.ipgp.fr
.. _`GNU Lesser General Public License, Version 3`:
https://www.gnu.org/copyleft/lesser.html
"""
from __future__ import (absolute_import, division, print_function,
unicode_literals)
from future.builtins import * # NOQA
from .client import Client # NOQA
if __name__ == '__main__':
import doctest
doctest.testmod(exclude_empty=True)