# obspy.clients.iris.client.Client.sacpz

`Client.``sacpz`(network, station, location='*', channel='*', starttime=None, endtime=None, filename=None, **kwargs)

  Low-level interface for sacpz Web service of IRIS (http://service.iris.edu/irisws/sacpz/) - release 1.1.1 (2012-1-9).

  This method provides access to instrument response information (per-channel) as poles and zeros in the ASCII format used by SAC and other programs. Users can query for channel response by network, station, channel, location and time.

  Parameters: | network (str) Network code, e.g. `'IU'`. station (str) Station code, e.g. `'ANMO'`. location (str, optional) Location code, e.g. `'00'`, wildcards allowed. Defaults to `'*'`. channel (str, optional) Channel code, e.g. `'BHZ'`, wildcards allowed. Defaults to `'*'`. starttime (`UTCDateTime`, optional) Start date and time. endtime (`UTCDateTime`, optional) End date and time. Requires `starttime` parameter. filename (str, optional) Name of a output file. If this parameter is given nothing will be returned. Default is `None`.
  Return type: | str or `None`
  Returns: | String with SAC poles and zeros information if no `filename` is given.

  Example

      >>> from obspy.clients.iris import Client
      >>> from obspy import UTCDateTime
      >>> client = Client()
      >>> dt = UTCDateTime("2005-01-01")
      >>> sacpz = client.sacpz("IU", "ANMO", "00", "BHZ", dt)
      >>> print(sacpz.decode())
      * **********************************
      * NETWORK   (KNETWK): IU
      * STATION    (KSTNM): ANMO
      * LOCATION   (KHOLE): 00
      * CHANNEL   (KCMPNM): BHZ
      * CREATED           : ...
      * START             : 2002-11-19T21:07:00
      * END               : 2008-06-30T00:00:00
      * DESCRIPTION       : Albuquerque, New Mexico, USA
      * LATITUDE          : 34.945981
      * LONGITUDE         : -106.457133
      * ELEVATION         : 1671.0
      * DEPTH             : 145.0
      * DIP               : 0.0
      * AZIMUTH           : 0.0
      * SAMPLE RATE       : 20.0
      * INPUT UNIT        : M
      * OUTPUT UNIT       : COUNTS
      * INSTTYPE          : Geotech KS-54000 Borehole Seismometer
      * INSTGAIN          : 1.935000e+03 (M/S)
      * COMMENT           :
      * SENSITIVITY       : 8.115970e+08 (M/S)
      * A0                : 8.608300e+04
      * **********************************
      ZEROS    3
          +0.000000e+00    +0.000000e+00
          +0.000000e+00    +0.000000e+00
          +0.000000e+00    +0.000000e+00
      POLES    5
          -5.943130e+01    +0.000000e+00
          -2.271210e+01    +2.710650e+01
          -2.271210e+01    -2.710650e+01
          -4.800400e-03    +0.000000e+00
          -7.319900e-02    +0.000000e+00
      CONSTANT    6.986470e+13

      ...

### Thank you!

We would like to thank our contributors, whose efforts make this software what it is. These people have helped by writing code and documentation, and by testing. They have created and maintained this product, its associated libraries and applications, our build tools and our web sites.

#### Contributors

- Ackerley, Nick
- Allgeyer, Sebastien
- Ammon, Charles J.
- Antunes, Emanuel
- Arnarsson, Ólafur St.
- Bank, Markus
- Barsch, Robert
- Behr, Yannik
- Bernardi, Fabrizio
- Bernauer, Felix
- Bes de Berc, Maxime
- Beyreuther, Moritz
- Boltz, Shawn
- Bonaimé, Sébastien
- Carothers, Lloyd
- Chamberlain, Calum
- Chambers, Derrick
- Chen, Zhao
- Clark, Adam
- Danecek, Peter
- Egdorf, Sven
- Engels, Fabian
- Ermert, Laura
- Eulenfeld, Tom

- Fabbri, Tommaso
- Falco, Nicholas
- Fee, Jeremy
- Grellier, Clément
- Grunberg, Marc
- Hammer, Conny
- Heimann, Sebastian
- Heiniger, Lukas
- Hope, Gaute
- Igel, Heiner
- Inza, Adolfo
- Isken, Marius
- Ketchum, David
- Koymans, Mathijs
- Kremers, Simon
- Kress, Victor
- Krieger, Lars
- Krischer, Lion
- Kula, Damian
- Käufl, Paul
- Köhler, Andreas
- Lecocq, Thomas
- Leeman, John
- Legovini, Paride

- Lesage, Philippe
- Li, Yulin
- Lomax, Anthony
- Lopes, Rui L.
- MacCarthy, Jonathan
- Maggi, Alessia
- Martin, Henri
- Medlin, Andrew
- Megies, Tobias
- Meschede, Matthias
- Michelini, Alberto
- Miller, Nathaniel C.
- Morgenstern, Bernhard
- Nof, Ran Novitsky
- Panning, Mark P.
- Parker, Tom
- Pestourie, Romain
- Rapagnani, Giovanni
- Reyes, Celso
- Ringler, Adam
- Rothenhäusler, Nicolas
- Russo, Emiliano
- Sales de Andrade, Elliott

- Satriano, Claudio
- Saul, Joachim
- Scheingraber, Chris
- Schneider, Simon
- Sippl, Christian
- Snoke, Arthur
- Stange, Stefan
- Stähler, Simon C.
- Sullivan, Benjamin
- Tian, Dongdong
- Trabant, Chad
- Trani, Luca
- Uieda, Leonardo
- Walker, Andrew
- Walther, Marcus
- Wassermann, Joachim
- Williams, Mark C.
- Winkelman, Andrew
- Zaccarelli, Riccardo
- Zad, Seyed Kasra Hosseini
- Zhu, Lijun
- van Driel, Martin
- van Wijk, Kasper

#### Funds

ObsPy was partially funded by the

- German Science Foundation (DFG) via grant DFG IG 16/9-1
- German Ministry for Education and Research (BMBF), GEOTECHNOLOGIEN grant 03G0646H.
- NERA project (Network of European Research Infrastructures for Earthquake Risk Assessment and Mitigation) under the European Community's Seventh Framework Programme (FP7/2007-2013) grant agreement n° 262330
- Leibniz Institute for Applied Geophysics (LIAG)
- VERCE EU-FP7 project (no. 283543)