International Federation of Digital Seismograph Networks
Thread: Re: proposal new blockettes
Sleeman, Reinoud (KNMI)
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?
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-----know
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
if we misunderstood the intention. The descriptive paragraph shouldoperation
clearly state that data parsers do not need to perform any further
when encountering this blockette to determine sample times. A lessinput
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
values. We ask the authors to clarify.alternative
In the case where the coefficients represent the actual data an
solution might be the use of blockette 2000 which can contain nearly anysamples
data.
In the case where the coefficients are fixed for a given set of input
the question arises for why this would be a data blockette instead ofwritten
as a station control header blockette. Blockette 62 could potentially bewithin
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
SEED,gauges
including a detailed description (see attached file):______________________________________________________________________
One is ``Delay time Information Blockette" which describes breakdown oftotal
delay time. The other is ``Quartz Pressure Blockette" which includes 14coefficients
to convert count value of quartz-type pressure gauge data to physicalvalue.
1. ``Delay time Information Blockette"
We are going to install some seismometers and quartz-type pressure
in seafloor this year.different
The clock time of seafloor data stamped at land base station is
from the time in seafloorstation,
observation because of the delay of time from sensor to seafloor
node point of optic submarinemicro-sec
cable, and the land base station.correction is written in field
This time difference is corrected in the land base station, and the time
16 (100 micro-sec unit) in Fixed Section of Data Header.to utilize the system check of
We here want to describe the breakdown of total delay time in SEED and
data transfer and the acquisition of more precise (more than 100
precision) time at sensor inobservation.
seafloor.
We want to define the new blockette on delay time for seafloor
coefficients2. ``Quartz Pressure Blockette"(Paroscientific, Inc.).
We observe water pressure using quartz-type pressure gauge
This gauge is monitoring not only water pressure but also temperaturein frequency domain for high-
accuracy measurement.
Data user needs to use conversion equations and 14 conversion
if they analyze the data withblockettes
physical value such as Pascal unit.pressure gauge.
We want to define the new blockette on the coefficient for quartz-type
______________________________________________________________________
_______
I'm not an expert in this type of measurements but the proposed
seems OK for me
within the SEED format. Please give me your opinion, if any. If thereare 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
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-----
know
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
if we misunderstood the intention. The descriptive paragraph should
operation
clearly state that data parsers do not need to perform any further
when encountering this blockette to determine sample times. A less
input
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
values. We ask the authors to clarify.
alternative
In the case where the coefficients represent the actual data an
solution might be the use of blockette 2000 which can contain nearly any
samples
data.
In the case where the coefficients are fixed for a given set of input
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
within
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
SEED,
gauges
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
in seafloor this year.
different
The clock time of seafloor data stamped at land base station is
from the time in seafloor
station,
observation because of the delay of time from sensor to seafloor
node point of optic submarine
micro-sec
cable, and the land base station.
correction is written in field
This time difference is corrected in the land base station, and the time
16 (100 micro-sec unit) in Fixed Section of Data Header.
to utilize the system check of
We here want to describe the breakdown of total delay time in SEED and
data transfer and the acquisition of more precise (more than 100
precision) time at sensor in
observation.
seafloor.
We want to define the new blockette on delay time for seafloor
coefficients2. ``Quartz Pressure Blockette"
(Paroscientific, Inc.).
We observe water pressure using quartz-type pressure gauge
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
if they analyze the data with
blockettes
physical value such as Pascal unit.
pressure gauge.
We want to define the new blockette on the coefficient for quartz-type
______________________________________________________________________
_______
I'm not an expert in this type of measurements but the proposed
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
-
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-----
predefined
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,
blockette (2001) is
I believe the detailed explanation by Seji concerning the proposed new
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
and described in
outputs
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.
is not a polynomial, could
For the second item I do not see how the equation for pressure, which
be written in blockette 62. I believe it also requires values from 2
(U, T), right ? If
equation
you have any suggestion/idea of how to incorporate such a complex
into a SEED blockette
proposal
let us know.
Tsuboi
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
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
operationin 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
blockettewhen encountering this blockette to determine sample times. This
Pleasealso 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.
coefficientssee 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
specificif they analyze the data with physical value such as Pascal unit.
of
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
the precision of data conversion.
use,
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
wesuch as is done for blockette 405. We are assuming that is this is a
know
bookkeeping blockette that documents components of the total time
correction in field 16 of the fixed section data header, please let us
if we misunderstood the intention. The descriptive paragraph should
operation
clearly state that data parsers do not need to perform any further
when encountering this blockette to determine sample times. A less
important characteristic is the usage of "10001" as a blockette type,
would recommended "2001".
2) We feel the proposal for a "Quartz Pressure Blockette" is too
entry
anybeing limited to a particular instrument type, a general solution would
input
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
values. We ask the authors to clarify.
alternative
In the case where the coefficients represent the actual data an
solution might be the use of blockette 2000 which can contain nearly
bedata.
samples
In the case where the coefficients are fixed for a given set of input
the question arises for why this would be a data blockette instead of
written
as a station control header blockette. Blockette 62 could potentially
extended by defining a new response type (equation), similar to the
______________________________________________________________________for the MacLaurirn pressure sensors, and create a new field 7.
within
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
SEED,
including a detailed description (see attached file):
ofOne is ``Delay time Information Blockette" which describes breakdown
14total
delay time. The other is ``Quartz Pressure Blockette" which includes
timecoefficients
gauges
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
in seafloor this year.
different
The clock time of seafloor data stamped at land base station is
from the time in seafloor
station,
observation because of the delay of time from sensor to seafloor
node point of optic submarine
cable, and the land base station.
This time difference is corrected in the land base station, and the
______________________________________________________________________correction is written in field
micro-sec
16 (100 micro-sec unit) in Fixed Section of Data Header.
to utilize the system check of
We here want to describe the breakdown of total delay time in SEED and
data transfer and the acquisition of more precise (more than 100
precision) time at sensor in
observation.
seafloor.
We want to define the new blockette on delay time for seafloor
coefficients2. ``Quartz Pressure Blockette"
(Paroscientific, Inc.).
We observe water pressure using quartz-type pressure gauge
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
if they analyze the data with
physical value such as Pascal unit.
pressure gauge.
We want to define the new blockette on the coefficient for quartz-type
_______
blockettes
I'm not an expert in this type of measurements but the proposed
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
-
-
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-----
opinion
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
the use of
predefined
a letter code (AA, B1 etc) for the data transfered path should be
and described in
outputs
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
(U, T), right ? If
proposal
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
in the following explanation. Please let us know if we need further
operation
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
when encountering this blockette to determine sample times. This blockette
specific
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-----
use,
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
such as is done for blockette 405. We are assuming that is this is a
know
bookkeeping blockette that documents components of the total time
correction in field 16 of the fixed section data header, please let us
if we misunderstood the intention. The descriptive paragraph should
operation
clearly state that data parsers do not need to perform any further
when encountering this blockette to determine sample times. A less
we
important characteristic is the usage of "10001" as a blockette type,
would recommended "2001".
2) We feel the proposal for a "Quartz Pressure Blockette" is too
entrybeing limited to a particular instrument type, a general solution would
input
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
values. We ask the authors to clarify.
alternative
In the case where the coefficients represent the actual data an
solution might be the use of blockette 2000 which can contain nearly any
samples
data.
In the case where the coefficients are fixed for a given set of input
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
for the MacLaurirn pressure sensors, and create a new field 7.
within
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
SEED,
______________________________________________________________________
including a detailed description (see attached file):
ofOne is ``Delay time Information Blockette" which describes breakdown
total
14
delay time. The other is ``Quartz Pressure Blockette" which includes
coefficients
gauges
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
in seafloor this year.
different
The clock time of seafloor data stamped at land base station is
from the time in seafloor
station,
observation because of the delay of time from sensor to seafloor
node point of optic submarine
time
cable, and the land base station.
This time difference is corrected in the land base station, and the
correction is written in field
micro-sec
16 (100 micro-sec unit) in Fixed Section of Data Header.
to utilize the system check of
We here want to describe the breakdown of total delay time in SEED and
data transfer and the acquisition of more precise (more than 100
precision) time at sensor in
observation.
seafloor.
We want to define the new blockette on delay time for seafloor
coefficients2. ``Quartz Pressure Blockette"
(Paroscientific, Inc.).
We observe water pressure using quartz-type pressure gauge
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
if they analyze the data with
______________________________________________________________________
physical value such as Pascal unit.
pressure gauge.
We want to define the new blockette on the coefficient for quartz-type
_______
blockettes
I'm not an expert in this type of measurements but the proposed
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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Attachments
Tim Ahern
Seiji Tsuboi