[webservices] irisFetch and SCEC data center - problem with data conversion?

[Aparna Bhaskaran]

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
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.iris.washington.edu/pipermail/webservices/attachments/20150723/166382ec/attachment.html>