On Mar 1, 2016, at 6:19 AM, Reinoud Sleeman <reinoud.sleeman<at>knmi.nl> wrote:
Dear WG-II members,
based on the initial proposal to standardize FDSN waveform quality metrics and the
feedback from Rick Benson, Florian Haslinger, Dan Auerbach, Doug Neuhauser and
Lion Krischer (thanks all) please find this updated, extended document (including some
basic definitions and illustrations) that covers a number of your suggestions:
· added data header/quality indicator as field to properly/uniquely identify time series records
· as indicated by Florian and Doug the time tolerance epsilon of '0' would be an overkill.
It is set now to 50% of the sampling interval.
· time window notation repaired, e.g. [t0, t1)
· definition of the ms_timing_correction metrics: here I followed Doug's suggestion to use
the "time correction" (field 16 in the fixed header).
· all metrics that were defined as "the number of records" that match some criteria has been changed
to percentage of data matching that criteria
· renaming of the metrics based on mini-SEED record header
· the discussion on using the data quality code Q to indicate that (agreed) quality metrics
have been calculated is interesting but seems IMHO not so relevant and practical to use. The
current definitions of D, R, Q and M are not very clear and therefore do not provide useful
information. The manual says that for Q some processes have been applied to the data, but (a) it
is not clear what processes and (b) whether this has altered the data or not. Therefore,
I would prefer to identify QC parameters for each datastream that is uniquely defined by network,
station, location, channel and quality code (R,D,Q,M) and NOT to use Q to identify that QC
parameters are calculated and available
Please provide me with your feedback within 3 weeks, otherwise I assume you agree with these metrics
definitions.
Thank you and best regards,
Reinoud
<Proposal definition QC metrics - v1.4.pdf>
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