International Federation of Digital Seismograph Networks

Thread: proposal new blockettes

None
Started: April 21, 2010, 9:22 p.m.
Last activity: Jan. 6, 2011, 4:53 p.m.
Reinoud Sleeman
April 21, 2010, 9:22 p.m.
Dear WG-II members,

I received the following request from JAMSTEC for 2 new blockettes within SEED,
including a detailed description (see attached file):

______________________________________________________________________

One is ``Delay time Information Blockette" which describes breakdown of total
delay time. The other is ``Quartz Pressure Blockette" which includes 14 coefficients
to convert count value of quartz-type pressure gauge data to physical value.


1. ``Delay time Information Blockette"
We are going to install some seismometers and quartz-type pressure gauges in seafloor this year.
The clock time of seafloor data stamped at land base station is different from the time in seafloor
observation because of the delay of time from sensor to seafloor station, node point of optic submarine
cable, and the land base station.
This time difference is corrected in the land base station, and the time correction is written in field
16 (100 micro-sec unit) in Fixed Section of Data Header.
We here want to describe the breakdown of total delay time in SEED and to utilize the system check of
data transfer and the acquisition of more precise (more than 100 micro-sec precision) time at sensor in
seafloor.
We want to define the new blockette on delay time for seafloor observation.

2. ``Quartz Pressure Blockette"
We observe water pressure using quartz-type pressure gauge (Paroscientific, Inc.).
This gauge is monitoring not only water pressure but also temperature in frequency domain for high-
accuracy measurement.
Data user needs to use conversion equations and 14 conversion coefficients if they analyze the data with
physical value such as Pascal unit.
We want to define the new blockette on the coefficient for quartz-type pressure gauge.

_____________________________________________________________________________


I'm not an expert in this type of measurements but the proposed blockettes seems OK for me
within the SEED format. Please give me your opinion, if any. If there are no objections within 3
weeks I will approve this proposal.

Best regards
Reinoud




  • Rick Benson
    April 21, 2010, 12:56 p.m.
    Hi, Reinoud-
    I think what would help is a recommendation for what the blockette
    number is that they propose (are they talking data record blockette
    so we'd have a blockette 300 or 3000 type of addition, or is this
    in the station headers. A specific proposal for what to number these.
    You mention there was an attached file, but unless you are referring to
    the inline text, we did not receive an "attachment" per se.

    Thanks
    Rick

    On Apr 21, 2010, at 12:22 PM, Sleeman, Reinoud (KNMI) wrote:

    Dear WG-II members,

    I received the following request from JAMSTEC for 2 new blockettes within SEED,
    including a detailed description (see attached file):

    ______________________________________________________________________

    One is ``Delay time Information Blockette" which describes breakdown of total
    delay time. The other is ``Quartz Pressure Blockette" which includes 14 coefficients
    to convert count value of quartz-type pressure gauge data to physical value.


    1. ``Delay time Information Blockette"
    We are going to install some seismometers and quartz-type pressure gauges in seafloor this year.
    The clock time of seafloor data stamped at land base station is different from the time in seafloor
    observation because of the delay of time from sensor to seafloor station, node point of optic submarine
    cable, and the land base station.
    This time difference is corrected in the land base station, and the time correction is written in field
    16 (100 micro-sec unit) in Fixed Section of Data Header.
    We here want to describe the breakdown of total delay time in SEED and to utilize the system check of
    data transfer and the acquisition of more precise (more than 100 micro-sec precision) time at sensor in
    seafloor.
    We want to define the new blockette on delay time for seafloor observation.

    2. ``Quartz Pressure Blockette"
    We observe water pressure using quartz-type pressure gauge (Paroscientific, Inc.).
    This gauge is monitoring not only water pressure but also temperature in frequency domain for high-
    accuracy measurement.
    Data user needs to use conversion equations and 14 conversion coefficients if they analyze the data with
    physical value such as Pascal unit.
    We want to define the new blockette on the coefficient for quartz-type pressure gauge.

    _____________________________________________________________________________


    I'm not an expert in this type of measurements but the proposed blockettes seems OK for me
    within the SEED format. Please give me your opinion, if any. If there are no objections within 3
    weeks I will approve this proposal.

    Best regards
    Reinoud



    _______________________________________________
    fdsn-wg2-data mailing list
    fdsn-wg2-data<at>iris.washington.edu
    http://www.iris.washington.edu/mailman/listinfo/fdsn-wg2-data

    ================
    Rick Benson
    Director of Operations
    IRIS DMC
    (206)547-0393 ext. 119(office)
    rick<at>iris.washington.edu






  • Reinoud Sleeman
    April 21, 2010, 10:24 p.m.

    Thanks, Rick - please find the attachment here.

    R



    Attachments
  • Chad Trabant
    April 22, 2010, 2:14 p.m.

    Dear WG-II,

    Regarding the two proposed data blockettes:

    1) The "Delay time Information Blockette" seems reasonable and we would suggest that it be accompanied by a paragraph describing the intended use, such as is done for blockette 405. We are assuming that is this is a bookkeeping blockette that documents components of the total time correction in field 16 of the fixed section data header, please let us know if we misunderstood the intention. The descriptive paragraph should clearly state that data parsers do not need to perform any further operation when encountering this blockette to determine sample times. A less important characteristic is the usage of "10001" as a blockette type, we would recommended "2001".

    2) We feel the proposal for a "Quartz Pressure Blockette" is too specific being limited to a particular instrument type, a general solution would be preferred.

    Also it is not clear if the coefficients are changing continuously and represent the actual data stream or are they fixed for a given set of input values. We ask the authors to clarify.

    In the case where the coefficients represent the actual data an alternative solution might be the use of blockette 2000 which can contain nearly any data.

    In the case where the coefficients are fixed for a given set of input samples the question arises for why this would be a data blockette instead of written as a station control header blockette. Blockette 62 could potentially be extended by defining a new response type (equation), similar to the entry for the MacLaurirn pressure sensors, and create a new field 7.

    regards,
    Chad Trabant
    Tim Ahern
    Rick Benson


    On Apr 21, 2010, at 12:22 PM, Sleeman, Reinoud (KNMI) wrote:

    Dear WG-II members,

    I received the following request from JAMSTEC for 2 new blockettes within SEED,
    including a detailed description (see attached file):

    ______________________________________________________________________

    One is ``Delay time Information Blockette" which describes breakdown of total
    delay time. The other is ``Quartz Pressure Blockette" which includes 14 coefficients
    to convert count value of quartz-type pressure gauge data to physical value.


    1. ``Delay time Information Blockette"
    We are going to install some seismometers and quartz-type pressure gauges in seafloor this year.
    The clock time of seafloor data stamped at land base station is different from the time in seafloor
    observation because of the delay of time from sensor to seafloor station, node point of optic submarine
    cable, and the land base station.
    This time difference is corrected in the land base station, and the time correction is written in field
    16 (100 micro-sec unit) in Fixed Section of Data Header.
    We here want to describe the breakdown of total delay time in SEED and to utilize the system check of
    data transfer and the acquisition of more precise (more than 100 micro-sec precision) time at sensor in
    seafloor.
    We want to define the new blockette on delay time for seafloor observation.

    2. ``Quartz Pressure Blockette"
    We observe water pressure using quartz-type pressure gauge (Paroscientific, Inc.).
    This gauge is monitoring not only water pressure but also temperature in frequency domain for high-
    accuracy measurement.
    Data user needs to use conversion equations and 14 conversion coefficients if they analyze the data with
    physical value such as Pascal unit.
    We want to define the new blockette on the coefficient for quartz-type pressure gauge.

    _____________________________________________________________________________


    I'm not an expert in this type of measurements but the proposed blockettes seems OK for me
    within the SEED format. Please give me your opinion, if any. If there are no objections within 3
    weeks I will approve this proposal.

    Best regards
    Reinoud



    _______________________________________________
    fdsn-wg2-data mailing list
    fdsn-wg2-data<at>iris.washington.edu
    http://www.iris.washington.edu/mailman/listinfo/fdsn-wg2-data



    • Seiji Tsuboi
      May 12, 2010, 11:35 a.m.
      Dear members of WG-II

      I am sorry for late replies to the comments. We try to clarify our proposal
      in the following explanation. Please let us know if we need further
      explanation.

      Thank you very much.
      Seiji Tsuboi

      1) This blockette documents components of the total time correction.
      As you pointed out, data users do not need to perform any further operation
      when encountering this blockette to determine sample times. This blockette
      also enables us to derive more precise time information, which depends on
      the frequency corresponding to the time unit (field 8,9,10), at each
      data-transfer stage before applying time correction. We modified the
      explanation of this blockette and temporarily named blockette 2001. Please
      see the attached file.

      2) To clalify the instrument what we are suing, we would explain some
      details.
      The quartz pressure gauge we install outputs periods of temperature and
      pressure.
      Data users need to use conversion equations and 14 conversion coefficients
      if they analyze the data with physical value such as Pascal unit.
      The conversion equations are as follows:

      Temperature=Y1*U^1+Y2*U^2+Y3*U^3 (physical value)

      U:Measured period of temperature (sensor output)
      Y1-Y3:Coefficinets

      Pressure=C(1-T0^2/T^2)(1-D(1-T0^2/T^2)) (physical value)

      C=C1+C2*U^1+C3*U^2
      D=D1+D2*U^1
      T0=T1+T2*U^1+T3*U^2+T4*U^3+T5*U^4

      T:Measured period of pressure (sensor output)
      C1-C3, D1-D2, T1-T5:Coefficients

      The coefficients are fixed for a given set of input samples.
      For pressure, the equation is complex and is not a polynomial equation,
      which may be different with an assumption of the Blockette 62 (Response
      [Polynomial] Blockette).
      Could you tell me whether we can extend or create a new field 7 of the
      Blockette 62 for the above pressure equation?
      We want to avoid the use of Maclaurin expansion because of the problem of
      the precision of data conversion.
      As another way, is it better to use the Blockette 62 to document the
      coefficient and also use the Blockette 31 to explain the above complex
      equation?

      -----Original Message-----
      From: fdsn-wg2-data-bounces<at>iris.washington.edu
      [fdsn-wg2-data-bounces<at>iris.washington.edu] On Behalf Of Chad
      Trabant
      Sent: Friday, April 23, 2010 6:15 AM
      To: fdsn-wg2-data<at>iris.washington.edu
      Subject: Re: [fdsn-wg2-data] proposal new blockettes


      Dear WG-II,

      Regarding the two proposed data blockettes:

      1) The "Delay time Information Blockette" seems reasonable and we would
      suggest that it be accompanied by a paragraph describing the intended use,
      such as is done for blockette 405. We are assuming that is this is a
      bookkeeping blockette that documents components of the total time
      correction in field 16 of the fixed section data header, please let us
      know
      if we misunderstood the intention. The descriptive paragraph should
      clearly state that data parsers do not need to perform any further
      operation
      when encountering this blockette to determine sample times. A less
      important characteristic is the usage of "10001" as a blockette type, we
      would recommended "2001".

      2) We feel the proposal for a "Quartz Pressure Blockette" is too specific
      being limited to a particular instrument type, a general solution would
      be preferred.

      Also it is not clear if the coefficients are changing continuously and
      represent the actual data stream or are they fixed for a given set of
      input
      values. We ask the authors to clarify.

      In the case where the coefficients represent the actual data an
      alternative
      solution might be the use of blockette 2000 which can contain nearly any
      data.

      In the case where the coefficients are fixed for a given set of input
      samples
      the question arises for why this would be a data blockette instead of
      written
      as a station control header blockette. Blockette 62 could potentially be
      extended by defining a new response type (equation), similar to the entry
      for the MacLaurirn pressure sensors, and create a new field 7.

      regards,
      Chad Trabant
      Tim Ahern
      Rick Benson


      On Apr 21, 2010, at 12:22 PM, Sleeman, Reinoud (KNMI) wrote:

      Dear WG-II members,

      I received the following request from JAMSTEC for 2 new blockettes
      within
      SEED,
      including a detailed description (see attached file):


      ______________________________________________________________________

      One is ``Delay time Information Blockette" which describes breakdown of
      total
      delay time. The other is ``Quartz Pressure Blockette" which includes 14
      coefficients
      to convert count value of quartz-type pressure gauge data to physical
      value.


      1. ``Delay time Information Blockette"
      We are going to install some seismometers and quartz-type pressure
      gauges
      in seafloor this year.
      The clock time of seafloor data stamped at land base station is
      different
      from the time in seafloor
      observation because of the delay of time from sensor to seafloor
      station,
      node point of optic submarine
      cable, and the land base station.
      This time difference is corrected in the land base station, and the time
      correction is written in field
      16 (100 micro-sec unit) in Fixed Section of Data Header.
      We here want to describe the breakdown of total delay time in SEED and
      to utilize the system check of
      data transfer and the acquisition of more precise (more than 100
      micro-sec
      precision) time at sensor in
      seafloor.
      We want to define the new blockette on delay time for seafloor
      observation.

      2. ``Quartz Pressure Blockette"
      We observe water pressure using quartz-type pressure gauge
      (Paroscientific, Inc.).
      This gauge is monitoring not only water pressure but also temperature
      in frequency domain for high-
      accuracy measurement.
      Data user needs to use conversion equations and 14 conversion
      coefficients
      if they analyze the data with
      physical value such as Pascal unit.
      We want to define the new blockette on the coefficient for quartz-type
      pressure gauge.


      ______________________________________________________________________
      _______


      I'm not an expert in this type of measurements but the proposed
      blockettes
      seems OK for me
      within the SEED format. Please give me your opinion, if any. If there
      are no objections within 3
      weeks I will approve this proposal.

      Best regards
      Reinoud



      _______________________________________________
      fdsn-wg2-data mailing list
      fdsn-wg2-data<at>iris.washington.edu
      http://www.iris.washington.edu/mailman/listinfo/fdsn-wg2-data


      _______________________________________________
      fdsn-wg2-data mailing list
      fdsn-wg2-data<at>iris.washington.edu
      http://www.iris.washington.edu/mailman/listinfo/fdsn-wg2-data

  • Seiji Tsuboi
    Dec. 20, 2010, 4:12 p.m.
    Dear WG-II members,

    We have proposed new blocketts for a while ago. I would be grateful if you
    would let us know any problems concerning with this proposal.

    Thank you very much.
    Seiji Tsuboi

    -----Original Message-----
    From: fdsn-wg2-data-bounces<at>iris.washington.edu
    [fdsn-wg2-data-bounces<at>iris.washington.edu] On Behalf Of Sleeman,
    Reinoud (KNMI)
    Sent: Thursday, April 22, 2010 4:23 AM
    To: fdsn-wg2-data<at>iris.washington.edu
    Subject: [fdsn-wg2-data] proposal new blockettes

    Dear WG-II members,

    I received the following request from JAMSTEC for 2 new blockettes within
    SEED, including a detailed description (see attached file):

    ______________________________________________________________________

    One is ``Delay time Information Blockette" which describes breakdown of
    totaldelay time. The other is ``Quartz Pressure Blockette" which includes
    14coefficients to convert count value of quartz-type pressure gauge data
    to physical value.


    1. ``Delay time Information Blockette"
    We are going to install some seismometers and quartz-type pressure gauges
    in seafloor this year.
    The clock time of seafloor data stamped at land base station is different
    from the time in seafloor
    observation because of the delay of time from sensor to seafloor station,
    node point of optic submarine
    cable, and the land base station.
    This time difference is corrected in the land base station, and the time
    correction is written in field
    16 (100 micro-sec unit) in Fixed Section of Data Header.
    We here want to describe the breakdown of total delay time in SEED and to
    utilize the system check of
    data transfer and the acquisition of more precise (more than 100 micro-sec
    precision) time at sensor in
    seafloor.
    We want to define the new blockette on delay time for seafloor
    observation.

    2. ``Quartz Pressure Blockette"
    We observe water pressure using quartz-type pressure gauge
    (Paroscientific,
    Inc.).
    This gauge is monitoring not only water pressure but also temperature in
    frequency domain for high-
    accuracy measurement.
    Data user needs to use conversion equations and 14 conversion coefficients
    if they analyze the data with
    physical value such as Pascal unit.
    We want to define the new blockette on the coefficient for quartz-type
    pressure gauge.

    ______________________________________________________________________
    _______


    I'm not an expert in this type of measurements but the proposed blockettes
    seems OK for me
    within the SEED format. Please give me your opinion, if any. If there are
    no objections within 3
    weeks I will approve this proposal.

    Best regards
    Reinoud



    _______________________________________________
    fdsn-wg2-data mailing list
    fdsn-wg2-data<at>iris.washington.edu
    http://www.iris.washington.edu/mailman/listinfo/fdsn-wg2-data



    • Seiji Tsuboi
      Jan. 6, 2011, 4:53 p.m.
      Dear WG-II members,

      Sorry for sending this email repeatedly but I would be grateful if you would
      consider this issue and send us any possible problems.

      Thank you very much.
      Seiji Tsuboi

      -----Original Message-----
      From: fdsn-wg2-data-bounces<at>iris.washington.edu
      [fdsn-wg2-data-bounces<at>iris.washington.edu] On Behalf Of Seiji
      Tsuboi
      Sent: Monday, December 20, 2010 4:13 PM
      To: 'Sleeman, Reinoud (KNMI)'; fdsn-wg2-data<at>iris.washington.edu
      Subject: Re: [fdsn-wg2-data] proposal new blockettes

      Dear WG-II members,

      We have proposed new blocketts for a while ago. I would be grateful if you
      would let us know any problems concerning with this proposal.

      Thank you very much.
      Seiji Tsuboi

      -----Original Message-----
      From: fdsn-wg2-data-bounces<at>iris.washington.edu
      [fdsn-wg2-data-bounces<at>iris.washington.edu] On Behalf Of
      Sleeman,
      Reinoud (KNMI)
      Sent: Thursday, April 22, 2010 4:23 AM
      To: fdsn-wg2-data<at>iris.washington.edu
      Subject: [fdsn-wg2-data] proposal new blockettes

      Dear WG-II members,

      I received the following request from JAMSTEC for 2 new blockettes
      within
      SEED, including a detailed description (see attached file):


      ______________________________________________________________________

      One is ``Delay time Information Blockette" which describes breakdown of
      totaldelay time. The other is ``Quartz Pressure Blockette" which
      includes
      14coefficients to convert count value of quartz-type pressure gauge data
      to physical value.


      1. ``Delay time Information Blockette"
      We are going to install some seismometers and quartz-type pressure
      gauges
      in seafloor this year.
      The clock time of seafloor data stamped at land base station is
      different
      from the time in seafloor
      observation because of the delay of time from sensor to seafloor
      station,
      node point of optic submarine
      cable, and the land base station.
      This time difference is corrected in the land base station, and the time
      correction is written in field
      16 (100 micro-sec unit) in Fixed Section of Data Header.
      We here want to describe the breakdown of total delay time in SEED and
      to
      utilize the system check of
      data transfer and the acquisition of more precise (more than 100
      micro-sec
      precision) time at sensor in
      seafloor.
      We want to define the new blockette on delay time for seafloor
      observation.

      2. ``Quartz Pressure Blockette"
      We observe water pressure using quartz-type pressure gauge
      (Paroscientific,
      Inc.).
      This gauge is monitoring not only water pressure but also temperature
      in
      frequency domain for high-
      accuracy measurement.
      Data user needs to use conversion equations and 14 conversion
      coefficients
      if they analyze the data with
      physical value such as Pascal unit.
      We want to define the new blockette on the coefficient for quartz-type
      pressure gauge.


      ______________________________________________________________________
      _______


      I'm not an expert in this type of measurements but the proposed
      blockettes
      seems OK for me
      within the SEED format. Please give me your opinion, if any. If there
      are
      no objections within 3
      weeks I will approve this proposal.

      Best regards
      Reinoud



      _______________________________________________
      fdsn-wg2-data mailing list
      fdsn-wg2-data<at>iris.washington.edu
      http://www.iris.washington.edu/mailman/listinfo/fdsn-wg2-data


      _______________________________________________
      fdsn-wg2-data mailing list
      fdsn-wg2-data<at>iris.washington.edu
      http://www.iris.washington.edu/mailman/listinfo/fdsn-wg2-data