Thread: Update to irisws-timeseries (1.4.9) released

Started: 2017-09-28 20:00:56
Last activity: 2017-09-28 20:00:56
Topics: Web Services
Robert Weekly
2017-09-28 20:00:56
Hello Web Service users,

The irisws-timeseries service has been updated to version 1.4.9.

Included with this release is a single change related to how decimation of a time series is performed. A brief description of this change is provided below and more supporting documentation can be found in the Help section of the web service documents (http://service.iris.edu/irisws/timeseries/docs/1/help/#deci)

Previously, requesting data while using the “deci/decimate” query parameter could result in an error if the ratio of the original sample rate and desired sample rate was not factorable by the numbers 2, 3, 5, and 7. With the update, the service is now much less likely to return an error and will instead return a time series decimated to the nearest requested sample rate that is factorable by the numbers mentioned above.

Please note that, by intention, this may lead to time series with an output sample rate that differs from the requested sample rate.

For example, if the original data is sampled at 50 Hz and the request decimates the time series to 4 Hz (below), then the output data will actually be sampled at 4.1666 Hz, as this is the closest factorable sample rate to the original request. If the “output=plot” option is selected in the request, the resulting sample rate can be verified by checking the value at the top of the figure.

http://service.iris.edu/irisws/timeseries/1/query?net=AV&sta=LSPA&loc=--&cha=SHZ&starttime=2017-01-01T00:00:00&endtime=2017-01-01T03:00:00&output=plot&demean=true&decimate=4





Please do not hesitate to provide feedback on this new method if you find it useful in your programming workflow. Thank you.

Regards,
IRIS DMC Services
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