Thread: irisFetch and SCEC data center - problem with data conversion?

Hi Shahar,

We have added a fix for the endian issue. All miniseed from the FDSN SCEDC
dataselect webservice should be big endian now. Could you try it out and
let us know what you find?

regards,
Aparna

On Thu, Jul 23, 2015 at 9:01 AM, Ellen Yu <eyu<at>gps.caltech.edu> wrote:

Thanks Shahar and Chad for making us aware of the issue. We are working
on a fix.


Ellen Yu

On Wed, Jul 22, 2015 at 3:25 PM, Chad Trabant <chad<at>iris.washington.edu>
wrote:

Hi Shahar,

The miniSEED returned from the SDEDC's service is encoded in
little-endian byte order using Steim-1 compression. This is not allowed by
the SEED standard. While some miniSEED software will read such data,
invalid as it is, the IRIS-WS Java library (used by irisFetch.m) does not
support it.

I suggest taking this issue up with SCEDC.

regards,
Chad

On Jul 22, 2015, at 3:03 PM, Shahar Barak <shaharb<at>stanford.edu> wrote:

Hi,

Data seems to be corrupted when using irisFetch and the SCEC data
center. Below is a plot of the same data downloaded via irisFetch from the
IRIS data center (top) and from the SCEC data center (bottom) (script
attached). The data looks fine and seems visually identical when I download
the mseed files directly via the web service (not using irisFetch):

http://service.iris.edu/fdsnws/dataselect/1/query?net=CI&sta=BAR&cha=BHZ&loc=--&start=2013-03-10T22:51:50.000&end=2013-03-10T23:51:50.000

http://service.scedc.caltech.edu/fdsnws/dataselect/1/query?net=CI&sta=BAR&cha=BHZ&loc=--&start=2013-03-10T22:51:50.000&end=2013-03-10T23:51:50.000

Help anyone? Did I do something wrong?

Thanks!

Shahar

[image: Inline image 1]
<SB_testFetch.m>_______________________________________________
webservices mailing list
webservices<at>iris.washington.edu
http://www.iris.washington.edu/mailman/listinfo/webservices



_______________________________________________
webservices mailing list
webservices<at>iris.washington.edu
http://www.iris.washington.edu/mailman/listinfo/webservices

_______________________________________________
webservices mailing list
webservices<at>iris.washington.edu
http://www.iris.washington.edu/mailman/listinfo/webservices

_______________________________________________
webservices mailing list
webservices<at>iris.washington.edu
http://www.iris.washington.edu/mailman/listinfo/webservices