IRIS DMC MUSTANG metrics Web Service Documentation

percent_availability Percentage of data available per day

Summary

The portion of data available for each day is represented as a percentage. 100% data available means that data for the reported start and end time is complete.

Uses

percent_availability values can be averaged to give data completeness for a channel over an integer number of days. The metric also indicates whether or not data for a given channel/day is available for request from the IRIS DMC.

Data Analyzed

Traces – one N.S.L.C (Network.Station.Location.Channel) per measurement
Window – 24 hours starting at 00:00:00 UTC
Data SourceIRIS miniSEED archive or IRIS PH5 archive

SEED Channel Types – ?H?, ?L?, ?N?, ?G?, ?P?, VM? | High Gain, Low Gain, Accelerometer, Gravimeter, Geophone, Mass Channels

Algorithm

  • Request 24 hours of data for a single N.S.L.C.
  • Sum the data gaps in seconds for this period of time.
  • Calculate the percentage from the ratio of data found (omitting gaps) to data expected for the full day:
    percent_available = 100 - ( 100 * gap_seconds / total_seconds )
    

Metric Values Returned

value – availability of data expressed as a percentage
target – the trace analyzed, labeled as N.S.L.C.Q (Network.Station.Location.Channel.Quality)
start – beginning of the data day requested (00:00:00 UTC)
end – end of the data day requested (truncated as 23:59:59 UTC)
lddate – date/time the measurement was made and loaded into the MUSTANG database (UTC)

Contact

See Also

Updated