Kung, Yu-Long [US-US]
Dear Data Processing team,
Recently, I work on the data downloaded from IRIS DMC in MiniSEED format and response metadata in GeoCSV format, xml format and/or RESP format.
Are Data in MiniSEED format already with time correction applied?
In a RESP file, different stages might have non-zero "Correction applied (seconds)" values.
Ex: for IU.ANMO..BHZ response
...
B050F03 Station: ANMO
B050F16 Network: IU
B052F03 Location: ??
B052F04 Channel: BHZ
B052F22 Start date: 1995,195,00:00:00
B052F23 End date: 1998,299,20:00:00
B057F03 Stage sequence number: 1
B057F08 Correction applied (seconds): +0.0000E+00
B057F03 Stage sequence number: 2
B057F08 Correction applied (seconds): +0.0000E+00
B057F03 Stage sequence number: 3
B057F08 Correction applied (seconds): +6.0000E-03
B057F03 Stage sequence number: 4
B057F08 Correction applied (seconds): +7.7000E-02
B057F03 Stage sequence number: 5
B057F08 Correction applied (seconds): +3.7900E-01
B057F03 Stage sequence number: 6
B057F08 Correction applied (seconds): +7.6000E-01
Is it correct if I assign CSS SENSOR.TSHIFT field to zero for all data returned in MiniSEED format?
Thanks
Yu-Long
Recently, I work on the data downloaded from IRIS DMC in MiniSEED format and response metadata in GeoCSV format, xml format and/or RESP format.
Are Data in MiniSEED format already with time correction applied?
In a RESP file, different stages might have non-zero "Correction applied (seconds)" values.
Ex: for IU.ANMO..BHZ response
...
B050F03 Station: ANMO
B050F16 Network: IU
B052F03 Location: ??
B052F04 Channel: BHZ
B052F22 Start date: 1995,195,00:00:00
B052F23 End date: 1998,299,20:00:00
B057F03 Stage sequence number: 1
B057F08 Correction applied (seconds): +0.0000E+00
B057F03 Stage sequence number: 2
B057F08 Correction applied (seconds): +0.0000E+00
B057F03 Stage sequence number: 3
B057F08 Correction applied (seconds): +6.0000E-03
B057F03 Stage sequence number: 4
B057F08 Correction applied (seconds): +7.7000E-02
B057F03 Stage sequence number: 5
B057F08 Correction applied (seconds): +3.7900E-01
B057F03 Stage sequence number: 6
B057F08 Correction applied (seconds): +7.6000E-01
Is it correct if I assign CSS SENSOR.TSHIFT field to zero for all data returned in MiniSEED format?
Thanks
Yu-Long
-
Dear Yu-long,
Apologies for our delay in responding to your earlier email. You are
correct that you do not need to apply time corrections to this miniseed
data. For these fields in the RESP file, the data logger will have
corrected for the digital filter time shift using these values.
Best regards,
Gillian Sharer
Earthscope Consortium
On Thu, Jan 26, 2023 at 9:01 AM Kung, Yu-Long [US-US] (via IRIS) <
data-processing-help-bounce<at>lists.ds.iris.edu> wrote:
Dear Data Processing team,
Recently, I work on the data downloaded from IRIS DMC in MiniSEED format
and response metadata in GeoCSV format, xml format and/or RESP format.
Are Data in MiniSEED format already with time correction applied?
In a RESP file, different stages might have non-zero “Correction applied
(seconds)” values.
Ex: for IU.ANMO..BHZ response
…
B050F03 Station: ANMO
B050F16 Network: IU
B052F03 Location: ??
B052F04 Channel: BHZ
B052F22 Start date: 1995,195,00:00:00
B052F23 End date: 1998,299,20:00:00
B057F03 Stage sequence number: 1
B057F08 Correction applied (seconds): +0.0000E+00
B057F03 Stage sequence number: 2
B057F08 Correction applied (seconds): +0.0000E+00
B057F03 Stage sequence number: 3
B057F08 Correction applied (seconds): +6.0000E-03
B057F03 Stage sequence number: 4
B057F08 Correction applied (seconds): +7.7000E-02
B057F03 Stage sequence number: 5
B057F08 Correction applied (seconds): +3.7900E-01
B057F03 Stage sequence number: 6
B057F08 Correction applied (seconds): +7.6000E-01
Is it correct if I assign CSS SENSOR.TSHIFT field to zero for all data
returned in MiniSEED format?
Thanks
Yu-Long
----------------------
Data Processing Help
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Dear Gillian
Many thanks for the confirmation.
Best Regards
Yu-Long
From: Gillian Sharer <gillian.sharer<at>earthscope.org>
Sent: Thursday, January 26, 2023 9:16 PM
To: Kung, Yu-Long [US-US] <YU-LONG.KUNG<at>leidos.com>; data-processing-help<at>lists.ds.iris.edu
Subject: EXTERNAL: Re: [IRIS][data-processing-help] data time correction
CAUTION: This email originated from outside of Leidos. Be cautious when clicking or opening content.
Dear Yu-long,
Apologies for our delay in responding to your earlier email. You are correct that you do not need to apply time corrections to this miniseed data. For these fields in the RESP file, the data logger will have corrected for the digital filter time shift using these values.
Best regards,
Gillian Sharer
Earthscope Consortium
On Thu, Jan 26, 2023 at 9:01 AM Kung, Yu-Long [US-US] (via IRIS) <data-processing-help-bounce<at>lists.ds.iris.edu<data-processing-help-bounce<at>lists.ds.iris.edu>> wrote:
Dear Data Processing team,
Recently, I work on the data downloaded from IRIS DMC in MiniSEED format and response metadata in GeoCSV format, xml format and/or RESP format.
Are Data in MiniSEED format already with time correction applied?
In a RESP file, different stages might have non-zero “Correction applied (seconds)” values.
Ex: for IU.ANMO..BHZ response
…
B050F03 Station: ANMO
B050F16 Network: IU
B052F03 Location: ??
B052F04 Channel: BHZ
B052F22 Start date: 1995,195,00:00:00
B052F23 End date: 1998,299,20:00:00
B057F03 Stage sequence number: 1
B057F08 Correction applied (seconds): +0.0000E+00
B057F03 Stage sequence number: 2
B057F08 Correction applied (seconds): +0.0000E+00
B057F03 Stage sequence number: 3
B057F08 Correction applied (seconds): +6.0000E-03
B057F03 Stage sequence number: 4
B057F08 Correction applied (seconds): +7.7000E-02
B057F03 Stage sequence number: 5
B057F08 Correction applied (seconds): +3.7900E-01
B057F03 Stage sequence number: 6
B057F08 Correction applied (seconds): +7.6000E-01
Is it correct if I assign CSS SENSOR.TSHIFT field to zero for all data returned in MiniSEED format?
Thanks
Yu-Long
----------------------
Data Processing Help
Topic home: http://ds.iris.edu/message-center/topic/data-processing-help/https://urldefense.us/v3/__http:/ds.iris.edu/message-center/topic/data-processing-help/__;!!Az_Xe1LHMyBq19w!cI6__VeoskGckg6SmkjzB4g1S4X-8p4CFUFUstPKcoUodSZJM6-JgIKdA9IaCK-gev4$> | Unsubscribe: data-processing-help-unsubscribe<at>lists.ds.iris.edu<data-processing-help-unsubscribe<at>lists.ds.iris.edu>
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-
Dear Gillian,
Thanks for the response and confirmation. I received your response last week. Not sure why I got this email again today. Might be our mail server.
I have another question about SAC format when request data via IRIS WS.
I checked SAC data returned from IRIS DMC WS when specified format=SAC, the SAC header SCALE value is sensitivity.
In the legacy IRIS “rdseed” application, it assigned calib ( = 1/sensitivity) to SAC header SCALE.
Lately, I also use python obspy python interfaces, it also assign calib to SAC header SCALE value.
Can you confirm the SAC data files returned from IRIS DMC WS with SAC HEADER SCALE assigned to sensitivity?
If so and rdseed assign calib to SAC header SCALE, I am wondering why SAC data file returned from IRISDMC using sensitivity instead?
I also noticed the geocsv file SCALE column also showing sensitivity.
Thanks
Yu-Long
From: data-processing-help-bounce<at>lists.ds.iris.edu <data-processing-help-bounce<at>lists.ds.iris.edu>
Sent: Monday, January 30, 2023 11:49 AM
To: Data Processing Help <data-processing-help<at>lists.ds.iris.edu>
Subject: EXTERNAL: Re: [IRIS][data-processing-help] data time correction
Dear Yu-long,
Apologies for our delay in responding to your earlier email. You are correct that you do not need to apply time corrections to this miniseed data. For these fields in the RESP file, the data logger will have corrected for the digital filter time shift using these values.
Best regards,
Gillian Sharer
Earthscope Consortium
On Thu, Jan 26, 2023 at 9:01 AM Kung, Yu-Long [US-US] (via IRIS) <data-processing-help-bounce<at>lists.ds.iris.edu<data-processing-help-bounce<at>lists.ds.iris.edu>> wrote:
Dear Data Processing team,
Recently, I work on the data downloaded from IRIS DMC in MiniSEED format and response metadata in GeoCSV format, xml format and/or RESP format.
Are Data in MiniSEED format already with time correction applied?
In a RESP file, different stages might have non-zero “Correction applied (seconds)” values.
Ex: for IU.ANMO..BHZ response
…
B050F03 Station: ANMO
B050F16 Network: IU
B052F03 Location: ??
B052F04 Channel: BHZ
B052F22 Start date: 1995,195,00:00:00
B052F23 End date: 1998,299,20:00:00
B057F03 Stage sequence number: 1
B057F08 Correction applied (seconds): +0.0000E+00
B057F03 Stage sequence number: 2
B057F08 Correction applied (seconds): +0.0000E+00
B057F03 Stage sequence number: 3
B057F08 Correction applied (seconds): +6.0000E-03
B057F03 Stage sequence number: 4
B057F08 Correction applied (seconds): +7.7000E-02
B057F03 Stage sequence number: 5
B057F08 Correction applied (seconds): +3.7900E-01
B057F03 Stage sequence number: 6
B057F08 Correction applied (seconds): +7.6000E-01
Is it correct if I assign CSS SENSOR.TSHIFT field to zero for all data returned in MiniSEED format?
Thanks
Yu-Long
----------------------
Data Processing Help
Topic home: http://ds.iris.edu/message-center/topic/data-processing-help/https://urldefense.us/v3/__http:/ds.iris.edu/message-center/topic/data-processing-help/__;!!Az_Xe1LHMyBq19w!b0nm7BNsM9T5oWQL9H5Y9MVSsgDvrn_MQBhHEzqgNXzNmc1jdnGNKP4MJyRIfzp7svU$> | Unsubscribe: data-processing-help-unsubscribe<at>lists.ds.iris.edu<data-processing-help-unsubscribe<at>lists.ds.iris.edu>
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-
Hi Yu-Long-
Which web service is returning SAC with the SCALE value being set?
Our current services may not behave in the same manner as the legacy rdseed application, since our business rules change over time. If you can specify which service, we can look at its behavior.
Regards,
-Rob
On Jan 30, 2023, at 9:01 AM, Kung, Yu-Long [US-US] (via IRIS) <data-processing-help-bounce<at>lists.ds.iris.edu> wrote:
Dear Gillian,
Thanks for the response and confirmation. I received your response last week. Not sure why I got this email again today. Might be our mail server.
I have another question about SAC format when request data via IRIS WS.
I checked SAC data returned from IRIS DMC WS when specified format=SAC, the SAC header SCALE value is sensitivity.
In the legacy IRIS “rdseed” application, it assigned calib ( = 1/sensitivity) to SAC header SCALE.
Lately, I also use python obspy python interfaces, it also assign calib to SAC header SCALE value.
Can you confirm the SAC data files returned from IRIS DMC WS with SAC HEADER SCALE assigned to sensitivity?
If so and rdseed assign calib to SAC header SCALE, I am wondering why SAC data file returned from IRISDMC using sensitivity instead?
I also noticed the geocsv file SCALE column also showing sensitivity.
Thanks
Yu-Long
From: data-processing-help-bounce<at>lists.ds.iris.edu <data-processing-help-bounce<at>lists.ds.iris.edu>
Sent: Monday, January 30, 2023 11:49 AM
To: Data Processing Help <data-processing-help<at>lists.ds.iris.edu>
Subject: EXTERNAL: Re: [IRIS][data-processing-help] data time correction
Dear Yu-long,
Apologies for our delay in responding to your earlier email. You are correct that you do not need to apply time corrections to this miniseed data. For these fields in the RESP file, the data logger will have corrected for the digital filter time shift using these values.
Best regards,
Gillian Sharer
Earthscope Consortium
On Thu, Jan 26, 2023 at 9:01 AM Kung, Yu-Long [US-US] (via IRIS) <data-processing-help-bounce<at>lists.ds.iris.edu <data-processing-help-bounce<at>lists.ds.iris.edu>> wrote:
Dear Data Processing team,
Recently, I work on the data downloaded from IRIS DMC in MiniSEED format and response metadata in GeoCSV format, xml format and/or RESP format.
Are Data in MiniSEED format already with time correction applied?
In a RESP file, different stages might have non-zero “Correction applied (seconds)” values.
Ex: for IU.ANMO..BHZ response
…
B050F03 Station: ANMO
B050F16 Network: IU
B052F03 Location: ??
B052F04 Channel: BHZ
B052F22 Start date: 1995,195,00:00:00
B052F23 End date: 1998,299,20:00:00
B057F03 Stage sequence number: 1
B057F08 Correction applied (seconds): +0.0000E+00
B057F03 Stage sequence number: 2
B057F08 Correction applied (seconds): +0.0000E+00
B057F03 Stage sequence number: 3
B057F08 Correction applied (seconds): +6.0000E-03
B057F03 Stage sequence number: 4
B057F08 Correction applied (seconds): +7.7000E-02
B057F03 Stage sequence number: 5
B057F08 Correction applied (seconds): +3.7900E-01
B057F03 Stage sequence number: 6
B057F08 Correction applied (seconds): +7.6000E-01
Is it correct if I assign CSS SENSOR.TSHIFT field to zero for all data returned in MiniSEED format?
Thanks
Yu-Long
----------------------
Data Processing Help
Topic home: http://ds.iris.edu/message-center/topic/data-processing-help/ https://urldefense.us/v3/__http:/ds.iris.edu/message-center/topic/data-processing-help/__;!!Az_Xe1LHMyBq19w!b0nm7BNsM9T5oWQL9H5Y9MVSsgDvrn_MQBhHEzqgNXzNmc1jdnGNKP4MJyRIfzp7svU$> | Unsubscribe: data-processing-help-unsubscribe<at>lists.ds.iris.edu <data-processing-help-unsubscribe<at>lists.ds.iris.edu>
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----------------------
Data Processing Help
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Dear Rob,
Thanks for prompt response
Here I listed information I gathered.
1. Here is the command to get the sac data from IRIS DMC.
wget -O IRISDMC_GUMO.zip -o IRISDMC_GUMO.log http://service.iris.edu/fdsnws/dataselect/1/query?sta=GUMO&start=2017-09-03T03:34:19&end=2017-09-03T04:51:19&format=sac.zip
after unzip and read only 10.BHZ SAC file using SAC, the scale is assigned to 3.262840e+10
SAC> r IU.GUMO.10.BHZ.M.2017.246.033419.SAC
SAC> lh SCALE
FILE: IU.GUMO.10.BHZ.M.2017.246.033419.SAC - 1
------------------------------------------
SCALE = 3.262840e+10
1. Here is the station/level=response request also from IRISDMC in geocsv format, the SCALE is assigned to 3.262840e+10
Network|Station|Location|Channel|Latitude|Longitude|Elevation|Depth|Azimuth|Dip|SensorDescription|Scale|ScaleFreq|ScaleUnits|SampleRate|StartTime|EndTime
…
IU|GUMO|10|BHZ|13.5893|144.8684|170.0|0.0|0.0|-90.0|Streckeisen STS-2 High-gain|3.26284E10|0.02|m/s|40.0|2011-08-16T05:50:00.0000|
…
1. Here is the rdseed description
https://github.com/iris-edu-legacy/rdseed
* CSS headers are handled in the same way as SAC headers, except that a scale factor is inserted into the CALIB variable. If gain reversal checking is active and a reversal is found, the data are inverted and the header CALIB value is also inverted.
4) This is from GUMO 10 BHZ RESP FILE ( I requested response in xml format then converted to RESP format )
# +-----------------------------------+
# | Channel Sensitivity/Gain |
# | IU GUMO 10 BHZ |
# | 08/16/2011 to No Ending Time |
# +-----------------------------------+
#
B058F03 Stage sequence number: 0
B058F04 Sensitivity: +3.26284E+10
B058F05 Frequency of sensitivity: +2.00000E-02
B058F06 Number of calibrations: 0
Thanks
Yu-Long
From: data-processing-help-bounce<at>lists.ds.iris.edu <data-processing-help-bounce<at>lists.ds.iris.edu>
Sent: Monday, January 30, 2023 1:07 PM
To: Data Processing Help <data-processing-help<at>lists.ds.iris.edu>
Subject: Re: [IRIS][data-processing-help] EXTERNAL: Re: data time correction
Hi Yu-Long-
Which web service is returning SAC with the SCALE value being set?
Our current services may not behave in the same manner as the legacy rdseed application, since our business rules change over time. If you can specify which service, we can look at its behavior.
Regards,
-Rob
On Jan 30, 2023, at 9:01 AM, Kung, Yu-Long [US-US] (via IRIS) <data-processing-help-bounce<at>lists.ds.iris.edu<data-processing-help-bounce<at>lists.ds.iris.edu>> wrote:
Dear Gillian,
Thanks for the response and confirmation. I received your response last week. Not sure why I got this email again today. Might be our mail server.
I have another question about SAC format when request data via IRIS WS.
I checked SAC data returned from IRIS DMC WS when specified format=SAC, the SAC header SCALE value is sensitivity.
In the legacy IRIS “rdseed” application, it assigned calib ( = 1/sensitivity) to SAC header SCALE.
Lately, I also use python obspy python interfaces, it also assign calib to SAC header SCALE value.
Can you confirm the SAC data files returned from IRIS DMC WS with SAC HEADER SCALE assigned to sensitivity?
If so and rdseed assign calib to SAC header SCALE, I am wondering why SAC data file returned from IRISDMC using sensitivity instead?
I also noticed the geocsv file SCALE column also showing sensitivity.
Thanks
Yu-Long
From: data-processing-help-bounce<at>lists.ds.iris.edu<data-processing-help-bounce<at>lists.ds.iris.edu> <data-processing-help-bounce<at>lists.ds.iris.edu<data-processing-help-bounce<at>lists.ds.iris.edu>>
Sent: Monday, January 30, 2023 11:49 AM
To: Data Processing Help <data-processing-help<at>lists.ds.iris.edu<data-processing-help<at>lists.ds.iris.edu>>
Subject: EXTERNAL: Re: [IRIS][data-processing-help] data time correction
Dear Yu-long,
Apologies for our delay in responding to your earlier email. You are correct that you do not need to apply time corrections to this miniseed data. For these fields in the RESP file, the data logger will have corrected for the digital filter time shift using these values.
Best regards,
Gillian Sharer
Earthscope Consortium
On Thu, Jan 26, 2023 at 9:01 AM Kung, Yu-Long [US-US] (via IRIS) <data-processing-help-bounce<at>lists.ds.iris.edu<data-processing-help-bounce<at>lists.ds.iris.edu>> wrote:
Dear Data Processing team,
Recently, I work on the data downloaded from IRIS DMC in MiniSEED format and response metadata in GeoCSV format, xml format and/or RESP format.
Are Data in MiniSEED format already with time correction applied?
In a RESP file, different stages might have non-zero “Correction applied (seconds)” values.
Ex: for IU.ANMO..BHZ response
…
B050F03 Station: ANMO
B050F16 Network: IU
B052F03 Location: ??
B052F04 Channel: BHZ
B052F22 Start date: 1995,195,00:00:00
B052F23 End date: 1998,299,20:00:00
B057F03 Stage sequence number: 1
B057F08 Correction applied (seconds): +0.0000E+00
B057F03 Stage sequence number: 2
B057F08 Correction applied (seconds): +0.0000E+00
B057F03 Stage sequence number: 3
B057F08 Correction applied (seconds): +6.0000E-03
B057F03 Stage sequence number: 4
B057F08 Correction applied (seconds): +7.7000E-02
B057F03 Stage sequence number: 5
B057F08 Correction applied (seconds): +3.7900E-01
B057F03 Stage sequence number: 6
B057F08 Correction applied (seconds): +7.6000E-01
Is it correct if I assign CSS SENSOR.TSHIFT field to zero for all data returned in MiniSEED format?
Thanks
Yu-Long
----------------------
Data Processing Help
Topic home: http://ds.iris.edu/message-center/topic/data-processing-help/https://urldefense.us/v3/__http:/ds.iris.edu/message-center/topic/data-processing-help/__;!!Az_Xe1LHMyBq19w!b0nm7BNsM9T5oWQL9H5Y9MVSsgDvrn_MQBhHEzqgNXzNmc1jdnGNKP4MJyRIfzp7svU$> | Unsubscribe: data-processing-help-unsubscribe<at>lists.ds.iris.edu<data-processing-help-unsubscribe<at>lists.ds.iris.edu>
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----------------------
Data Processing Help
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Dear Rob,
I also noticed python obspy 1.4.0 assigned CALIB to SAC.SCALE header field (ex. Reading in GSE2.0 format and writing out as SAC format)
The other question is about column ScaleUnits in geocsv file. If Scale is sensitivity, is the ScaleUnits like V/ (m/s) (or count/ (m/s) ) not m/s ?
Thanks
Yu-Long
From: data-processing-help-bounce<at>lists.ds.iris.edu <data-processing-help-bounce<at>lists.ds.iris.edu>
Sent: Monday, January 30, 2023 2:17 PM
To: Data Processing Help <data-processing-help<at>lists.ds.iris.edu>
Subject: RE: [IRIS][data-processing-help] EXTERNAL: Re: data time correction
Dear Rob,
Thanks for prompt response
Here I listed information I gathered.
1. Here is the command to get the sac data from IRIS DMC.
wget -O IRISDMC_GUMO.zip -o IRISDMC_GUMO.log http://service.iris.edu/fdsnws/dataselect/1/query?sta=GUMO&start=2017-09-03T03:34:19&end=2017-09-03T04:51:19&format=sac.ziphttps://urldefense.us/v3/__http:/service.iris.edu/fdsnws/dataselect/1/query?sta=GUMO&start=2017-09-03T03:34:19&end=2017-09-03T04:51:19&format=sac.zip__;!!Az_Xe1LHMyBq19w!dBCncSKbKhWxGH0HxxjSXsPJDU6xUE1TmP246hh-fYKjyqZuYG9jwpZtsIHXwGALSqI$>
after unzip and read only 10.BHZ SAC file using SAC, the scale is assigned to 3.262840e+10
SAC> r IU.GUMO.10.BHZ.M.2017.246.033419.SAC
SAC> lh SCALE
FILE: IU.GUMO.10.BHZ.M.2017.246.033419.SAC - 1
------------------------------------------
SCALE = 3.262840e+10
1. Here is the station/level=response request also from IRISDMC in geocsv format, the SCALE is assigned to 3.262840e+10
Network|Station|Location|Channel|Latitude|Longitude|Elevation|Depth|Azimuth|Dip|SensorDescription|Scale|ScaleFreq|ScaleUnits|SampleRate|StartTime|EndTime
…
IU|GUMO|10|BHZ|13.5893|144.8684|170.0|0.0|0.0|-90.0|Streckeisen STS-2 High-gain|3.26284E10|0.02|m/s|40.0|2011-08-16T05:50:00.0000|
…
1. Here is the rdseed description
https://github.com/iris-edu-legacy/rdseedhttps://urldefense.us/v3/__https:/github.com/iris-edu-legacy/rdseed__;!!Az_Xe1LHMyBq19w!dBCncSKbKhWxGH0HxxjSXsPJDU6xUE1TmP246hh-fYKjyqZuYG9jwpZtsIHXL7LigkA$>
* CSS headers are handled in the same way as SAC headers, except that a scale factor is inserted into the CALIB variable. If gain reversal checking is active and a reversal is found, the data are inverted and the header CALIB value is also inverted.
4) This is from GUMO 10 BHZ RESP FILE ( I requested response in xml format then converted to RESP format )
# +-----------------------------------+
# | Channel Sensitivity/Gain |
# | IU GUMO 10 BHZ |
# | 08/16/2011 to No Ending Time |
# +-----------------------------------+
#
B058F03 Stage sequence number: 0
B058F04 Sensitivity: +3.26284E+10
B058F05 Frequency of sensitivity: +2.00000E-02
B058F06 Number of calibrations: 0
Thanks
Yu-Long
From: data-processing-help-bounce<at>lists.ds.iris.edu <data-processing-help-bounce<at>lists.ds.iris.edu>
Sent: Monday, January 30, 2023 1:07 PM
To: Data Processing Help <data-processing-help<at>lists.ds.iris.edu>
Subject: Re: [IRIS][data-processing-help] EXTERNAL: Re: data time correction
Hi Yu-Long-
Which web service is returning SAC with the SCALE value being set?
Our current services may not behave in the same manner as the legacy rdseed application, since our business rules change over time. If you can specify which service, we can look at its behavior.
Regards,
-Rob
On Jan 30, 2023, at 9:01 AM, Kung, Yu-Long [US-US] (via IRIS) <data-processing-help-bounce<at>lists.ds.iris.edu<data-processing-help-bounce<at>lists.ds.iris.edu>> wrote:
Dear Gillian,
Thanks for the response and confirmation. I received your response last week. Not sure why I got this email again today. Might be our mail server.
I have another question about SAC format when request data via IRIS WS.
I checked SAC data returned from IRIS DMC WS when specified format=SAC, the SAC header SCALE value is sensitivity.
In the legacy IRIS “rdseed” application, it assigned calib ( = 1/sensitivity) to SAC header SCALE.
Lately, I also use python obspy python interfaces, it also assign calib to SAC header SCALE value.
Can you confirm the SAC data files returned from IRIS DMC WS with SAC HEADER SCALE assigned to sensitivity?
If so and rdseed assign calib to SAC header SCALE, I am wondering why SAC data file returned from IRISDMC using sensitivity instead?
I also noticed the geocsv file SCALE column also showing sensitivity.
Thanks
Yu-Long
From: data-processing-help-bounce<at>lists.ds.iris.edu<data-processing-help-bounce<at>lists.ds.iris.edu> <data-processing-help-bounce<at>lists.ds.iris.edu<data-processing-help-bounce<at>lists.ds.iris.edu>>
Sent: Monday, January 30, 2023 11:49 AM
To: Data Processing Help <data-processing-help<at>lists.ds.iris.edu<data-processing-help<at>lists.ds.iris.edu>>
Subject: EXTERNAL: Re: [IRIS][data-processing-help] data time correction
Dear Yu-long,
Apologies for our delay in responding to your earlier email. You are correct that you do not need to apply time corrections to this miniseed data. For these fields in the RESP file, the data logger will have corrected for the digital filter time shift using these values.
Best regards,
Gillian Sharer
Earthscope Consortium
On Thu, Jan 26, 2023 at 9:01 AM Kung, Yu-Long [US-US] (via IRIS) <data-processing-help-bounce<at>lists.ds.iris.edu<data-processing-help-bounce<at>lists.ds.iris.edu>> wrote:
Dear Data Processing team,
Recently, I work on the data downloaded from IRIS DMC in MiniSEED format and response metadata in GeoCSV format, xml format and/or RESP format.
Are Data in MiniSEED format already with time correction applied?
In a RESP file, different stages might have non-zero “Correction applied (seconds)” values.
Ex: for IU.ANMO..BHZ response
…
B050F03 Station: ANMO
B050F16 Network: IU
B052F03 Location: ??
B052F04 Channel: BHZ
B052F22 Start date: 1995,195,00:00:00
B052F23 End date: 1998,299,20:00:00
B057F03 Stage sequence number: 1
B057F08 Correction applied (seconds): +0.0000E+00
B057F03 Stage sequence number: 2
B057F08 Correction applied (seconds): +0.0000E+00
B057F03 Stage sequence number: 3
B057F08 Correction applied (seconds): +6.0000E-03
B057F03 Stage sequence number: 4
B057F08 Correction applied (seconds): +7.7000E-02
B057F03 Stage sequence number: 5
B057F08 Correction applied (seconds): +3.7900E-01
B057F03 Stage sequence number: 6
B057F08 Correction applied (seconds): +7.6000E-01
Is it correct if I assign CSS SENSOR.TSHIFT field to zero for all data returned in MiniSEED format?
Thanks
Yu-Long
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Gillian Sharer
Rob Casey
