DART instrument Response Decimation Swapped in stages - #2518

Hi there !
as a start
something to grind on about the response of the DART
to make them validated by the IRIS /sage/gage/earthscope stationxml validator
https://github.com/iris-edu/stationxml-validator
some suggestion of Mark in the related ticket :)

@ozym @Thomas-Benson

I think we probably don't need the second stage. The only requirement is to swap between volts and counts, but these instruments don't record in volts.

Hi @ozym thanks i shortened the response to one single stage as a test.

• This passes the fdsn stationxml validation as we set the sampling reference and input sample right

• the problem i have further down the line (had it before for toast ...):

  Seiscomp .. does not to not accept/parse/convert entirely "a one stage only response" as produced by delta
  since it doesn't pick up a "sensor" information

  using scinv check test.xml :

Checking inventory ... done
I Stream NZ.NZA.40.UTZ
  no sensor and thus no response information available
I Stream NZ.NZA.41.UTZ
  no sensor and thus no response information available
I Stream NZ.NZA.42.UTZ
  no sensor and thus no response information available

i have attached the stationxml FDSN one stage as producef for NZA UTZ from delta
and the converted seiscomp station xml (scpxml)

test.scpxml.txt
test.xml.txt

cheers!

Okay, Plan B. Make the input sample rate for the second stage the same as the first (e.g. 0.06666666666666667) with a factor of 1. That is, no decimation.

You could also try -15 rather than 0.06666666666666667

Test -900 and -15

• Our tests of -900 and -15 sampling ratea are passing our stationxml tools and the seiscomp parser/conversion checks.
• Yet the java -jar stationxml-validator-1.7.5.jar test.xml --verbose --debug --continue-on-error test gives error 421:
  421,Error,NZ,NZA,WTZ,42,2023-12-16T00:15:00,,Chan:Samplerate 0.0011111111111111111 != [stage 02] Decimation:Frequency/Decimation:Factor -900.0

->Maybe the validator might also need an update to account for -900 and -15 sampling convention
(or respone not enough well formed) ?

test.xml.txt
test.scpxml.txt
test_OK_NZA.xml.txt

• I updated the PR 0.0333 and 0.00111 sampling rate to passs the validation instead
  and it s ok for the seiscomp conversion tools too

• ticket to IRIS for the java validator - though validator is not currwently maintained also it is set up for version 1.1

Kia Ora @Thomas-Benson @ozym
Could we have a last check on that PR for DART REsponse consistency ?
(no that this is used intensevely though)

As we move toward stationxml 1.2 it d be great to have this PR reviewed thanks!

Hi @Thomas-Benson Would youhave a go at this
perhaps also using obspy tools ?
Thanks !

Hi @Thomas-Benson @ozym :)
as we went to stationxml 1.2 and that this PR is 4 months old
May i get a final review/
thansk :)