International Federation of Digital Seismograph Networks

Thread: Re: proposal new blockettes

None
Started: Jan. 6, 2011, 11:14 a.m.
Last activity: Jan. 13, 2011, 9:44 a.m.
Sleeman, Reinoud (KNMI)
Jan. 6, 2011, 11:14 a.m.
Dear WG-II members,

I believe the detailed explanation by Seji concerning the proposed new blockette (2001) is
clear and answers the questions by Chad, Tim and Rick. However, in my opinion the use of
a letter code (AA, B1 etc) for the data transfered path should be predefined and described in
the SEED manual. Seji, can you please define the codes as you are using them now ?
Apart from this I believe this blockette can be approved - if you have any objection please
let us know within 2 weeks.

For the second item I do not see how the equation for pressure, which is not a polynomial, could
be written in blockette 62. I believe it also requires values from 2 outputs (U, T), right ? If
you have any suggestion/idea of how to incorporate such a complex equation into a SEED blockette
let us know.

Best regards - and a happy new year to all of you !

Reinoud

________________________________

From: fdsn-wg2-data-bounces<at>iris.washington.edu on behalf of Seiji Tsuboi
Sent: Wed 5/12/2010 4:35
To: fdsn-wg2-data<at>iris.washington.edu
Subject: Re: [fdsn-wg2-data] proposal new blockettes



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




  • Tim Ahern
    Jan. 7, 2011, noon
    Seiji

    Can you clarify if these are both data blockettes? If they are would any changes need to be made to rdseed or any other
    standard SEED utilities? It has been so long I can't remember (or find in my email any of the specifics)


    Cheers
    Tim

    Program Manager, IRIS Data Management System
    IRIS DMC
    1408 NE 45th Street #201
    Seattle, WA 98105

    (206)547-0393 x118
    (206) 547-1093 FAX







    On Jan 6, 2011, at 2:14 AM, Sleeman, Reinoud (KNMI) wrote:

    Dear WG-II members,

    I believe the detailed explanation by Seji concerning the proposed new blockette (2001) is
    clear and answers the questions by Chad, Tim and Rick. However, in my opinion the use of
    a letter code (AA, B1 etc) for the data transfered path should be predefined and described in
    the SEED manual. Seji, can you please define the codes as you are using them now ?
    Apart from this I believe this blockette can be approved - if you have any objection please
    let us know within 2 weeks.

    For the second item I do not see how the equation for pressure, which is not a polynomial, could
    be written in blockette 62. I believe it also requires values from 2 outputs (U, T), right ? If
    you have any suggestion/idea of how to incorporate such a complex equation into a SEED blockette
    let us know.

    Best regards - and a happy new year to all of you !

    Reinoud

    ________________________________

    From: fdsn-wg2-data-bounces<at>iris.washington.edu on behalf of Seiji Tsuboi
    Sent: Wed 5/12/2010 4:35
    To: fdsn-wg2-data<at>iris.washington.edu
    Subject: Re: [fdsn-wg2-data] proposal new blockettes



    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



    _______________________________________________
    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. 13, 2011, 9:41 a.m.
      Dear Tim,

      Sorry for my late reply to your email.
      Yes. These are for data blockettes and I believe that they will not need any
      changes to rdseed etc.

      Regards,
      Seiji Tsuboi

      -----Original Message-----
      From: Tim Ahern [tim<at>iris.washington.edu]
      Sent: Saturday, January 08, 2011 5:00 AM
      To: Sleeman, Reinoud (KNMI)
      Cc: Seiji Tsuboi; fdsn-wg2-data<at>iris.washington.edu
      Subject: Re: [fdsn-wg2-data] proposal new blockettes

      Seiji

      Can you clarify if these are both data blockettes? If they are would any
      changes need to be made to rdseed or any other
      standard SEED utilities? It has been so long I can't remember (or find
      in my email any of the specifics)


      Cheers
      Tim

      Program Manager, IRIS Data Management System
      IRIS DMC
      1408 NE 45th Street #201
      Seattle, WA 98105

      (206)547-0393 x118
      (206) 547-1093 FAX







      On Jan 6, 2011, at 2:14 AM, Sleeman, Reinoud (KNMI) wrote:

      Dear WG-II members,

      I believe the detailed explanation by Seji concerning the proposed new
      blockette (2001) is
      clear and answers the questions by Chad, Tim and Rick. However, in my
      opinion the use of
      a letter code (AA, B1 etc) for the data transfered path should be
      predefined
      and described in
      the SEED manual. Seji, can you please define the codes as you are using
      them now ?
      Apart from this I believe this blockette can be approved - if you have
      any objection please
      let us know within 2 weeks.

      For the second item I do not see how the equation for pressure, which
      is not a polynomial, could
      be written in blockette 62. I believe it also requires values from 2
      outputs
      (U, T), right ? If
      you have any suggestion/idea of how to incorporate such a complex
      equation
      into a SEED blockette
      let us know.

      Best regards - and a happy new year to all of you !

      Reinoud

      ________________________________

      From: fdsn-wg2-data-bounces<at>iris.washington.edu on behalf of Seiji
      Tsuboi
      Sent: Wed 5/12/2010 4:35
      To: fdsn-wg2-data<at>iris.washington.edu
      Subject: Re: [fdsn-wg2-data] proposal new blockettes



      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



      _______________________________________________
      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. 13, 2011, 9:44 a.m.
    Dear Reinoud

    Thank you very much for your comments on our proposal.
    We now have modified our proposal based on your comments.
    I hope that this will suffice your concerns.

    1)Delay Time Information Blockette

    We slightly modified the delay time blockette.
    We removed the field of ``data transferred path" and added variable comment
    space for more general usage. It is necessary to contain the path
    information in the delay time blockette because the delay time is sometimes
    changed by the transfered path.

    But this path information may be used for not only delay time but also other
    purposes such as station and network information.

    So, making another new blockette on the path information may be useful.

    Instead of this, for the delay time blockette, we added comment space for
    more general usage such as path information, cable status (for example,
    cable connection/disconnection), starting date, and so on.

    The blockette we propose here is data blockettes including next blockette's
    byte number and is not linked with other blockettes.


    2)Quartz Pressure Blockette

    We discussed this blockette in our group.

    We are going to use the quartz pressure gauge data in frequency domain only
    in our group and not open the data, although we are going to open the time
    domain data.

    From this data policy, constructing new blockette on the quartz pressure
    information may not be needed in the immediate future.

    We here want to withdraw ``Quartz Pressure Blockette'' and examine the best
    way of sending the information within our group.

    Best regards,
    Seiji Tsuboi

    -----Original Message-----
    From: Sleeman, Reinoud (KNMI) [reinoud.sleeman<at>knmi.nl]
    Sent: Thursday, January 06, 2011 7:15 PM
    To: Seiji Tsuboi; fdsn-wg2-data<at>iris.washington.edu
    Subject: RE: [fdsn-wg2-data] proposal new blockettes

    Dear WG-II members,

    I believe the detailed explanation by Seji concerning the proposed new
    blockette (2001) is
    clear and answers the questions by Chad, Tim and Rick. However, in my
    opinion
    the use of
    a letter code (AA, B1 etc) for the data transfered path should be
    predefined
    and described in
    the SEED manual. Seji, can you please define the codes as you are using
    them now ?
    Apart from this I believe this blockette can be approved - if you have any
    objection please
    let us know within 2 weeks.

    For the second item I do not see how the equation for pressure, which is
    not a polynomial, could
    be written in blockette 62. I believe it also requires values from 2
    outputs
    (U, T), right ? If
    you have any suggestion/idea of how to incorporate such a complex equation
    into a SEED blockette
    let us know.

    Best regards - and a happy new year to all of you !

    Reinoud

    ________________________________

    From: fdsn-wg2-data-bounces<at>iris.washington.edu on behalf of Seiji Tsuboi
    Sent: Wed 5/12/2010 4:35
    To: fdsn-wg2-data<at>iris.washington.edu
    Subject: Re: [fdsn-wg2-data] proposal new blockettes



    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



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