[webservices] empty loc code in fdsnws/station query

Chad Trabant chad at iris.washington.edu
Thu Jun 25 12:38:03 PDT 2015 

>  Perhaps something to do with the changes to the loc code to represent empty?

The loc code representation change should not have effected this.  The old Wilber is gone and it was not using web services back then anyway (and that's the only place location code representation changed).

>> Any chance your copy has been modified in the last 4 years?

>No, it has the original date and I never write mseed.

That leaves us with a conundrum I'm afraid.

Did you get metadata with the original Wilber request?

>I am leaving for IUGG tomorrow, so may be respond rapidly to any more discussion on this.

We can discuss more over a coffee...

Chad


> 
> From: "Robert Casey" <rob at iris.washington.edu <mailto:rob at iris.washington.edu>>
> To: "IRIS Web Services List" <webservices at iris.washington.edu <mailto:webservices at iris.washington.edu>>, "Rick Benson" <rick at iris.washington.edu <mailto:rick at iris.washington.edu>>
> Sent: Thursday, 25 June, 2015 8:11:12 PM
> Subject: Re: [webservices] empty loc code in fdsnws/station query
> 
> 
> 	Hi Anthony-
> 
> 	I checked the wayback machine to find a time when II would have transitioned their data from using an empty location code.  I found an announcement from Rick back in Dec 2001 regarding IRIS/IDA resending their data to correct for mistakes in the MK7 datalogger.  At that point, they were supposed to re-send data going back to 1993 containing numeric location codes.  Since you are looking at 1992 data, I am not sure when that got shifted in our archives, so what you received may indeed be pretty old.  Perhaps Rick can remember what the II resend history looked like.
> 
> 	Data is a constantly shifting medium here.  Probably good for you to get a fresh copy of this event from WILBER III.
> 
> 
> 	-RobC
> 
> 
> On Jun 25, 2015, at 10:50 AM, Chad Trabant <chad at iris.washington.edu <mailto:chad at iris.washington.edu>> wrote:
> 
> 
> Hi Anthony,
> 
> The location code in that data is definitely empty.  I did a quick check and it is exactly the same waveform as the II.AAK data the DMC is serving with location ID '00'.
> 
> I have no idea what happened to that data such that the location ID is not present in the copy you have.  The data in the archive was written pre-2011 and not modified since and such a change is not something the DMC would do during delivery.  Any chance your copy has been modified in the last 4 years?
> 
> Chad
> 
> On Jun 21, 2015, at 12:13 PM, Anthony Lomax <alomax at free.fr <mailto:alomax at free.fr>> wrote:
> 
> Hi Chad,
> 
> Thanks for the information.  I am reading an mseed file downloaded from IRIS Wilbur in 2011 or earlier, and it appears in my software that the location code is empty:
> https://dl.dropboxusercontent.com/u/35233023/Flores_Indonesia_1992.mseed <https://dl.dropboxusercontent.com/u/35233023/Flores_Indonesia_1992.mseed>
> 
> ???
> 
> Thanks!
> 
> Anthony
> 
> PS - I have added a work around to this in my code, so you do not need to reply again on the weekend!
> 
> On 21/06/2015 11:43, Chad Trabant wrote:
> 
> Hi Anthony,
> 
> The 204 means "no matching data selected".  If you would like to see the error returned in your web browser try adding the parameter-value "nodata=404":
> 
> http://service.iris.edu/fdsnws/station/1/query?net=II&sta=AAK&loc=--&cha=BHZ&starttime=1992-12-12&endtime=1992-12-12&level=station&nodata=404 <http://service.iris.edu/fdsnws/station/1/query?net=II&sta=AAK&loc=--&cha=BHZ&starttime=1992-12-12&endtime=1992-12-12&level=station&nodata=404>
> 
> If you submit the query with channel level details:
> http://service.iris.edu/fdsnws/station/1/query?net=II&sta=AAK&cha=BHZ&starttime=1992-12-12&endtime=1992-12-12&level=channel&nodata=404 <http://service.iris.edu/fdsnws/station/1/query?net=II&sta=AAK&cha=BHZ&starttime=1992-12-12&endtime=1992-12-12&level=channel&nodata=404>
> 
> you'll see that there are no channels with empty location IDs.
> 
> Chad
> 
> On Jun 21, 2015, at 10:54 AM, Anthony Lomax <alomax at free.fr <mailto:alomax at free.fr>> wrote:
> 
> In fact, what is returned is:
> Query: http://service.iris.edu/fdsnws/station/1/query?net=II&sta=TLY&loc=--&cha=BHZ&starttime=1992-12-12&endtime=1992-12-12&level=chan <http://service.iris.edu/fdsnws/station/1/query?net=II&sta=TLY&loc=--&cha=BHZ&starttime=1992-12-12&endtime=1992-12-12&level=chan>
> HTTP/1.1 204 No Content
> 
> ???
> 
> Thanks,
> 
> Anthony
> 
> On 21/06/2015 10:50, Anthony Lomax wrote:
> Hi,
> 
> The following gives nothing in my browser (no error, no change of page...):
> http://service.iris.edu/fdsnws/station/1/query?net=II&sta=AAK&loc=--&cha=BHZ&starttime=1992-12-12&endtime=1992-12-12&level=station <http://service.iris.edu/fdsnws/station/1/query?net=II&sta=AAK&loc=--&cha=BHZ&starttime=1992-12-12&endtime=1992-12-12&level=station>
> 
> If I remove the loc=--, it works fine:
> http://service.iris.edu/fdsnws/station/1/query?net=II&sta=AAK&cha=BHZ&starttime=1992-12-12&endtime=1992-12-12&level=station <http://service.iris.edu/fdsnws/station/1/query?net=II&sta=AAK&cha=BHZ&starttime=1992-12-12&endtime=1992-12-12&level=station>
> 
> Doc says:
> loc[ation]     00     Select one or more SEED location identifier. Use -- for “Blank” location IDs (ID’s containing 2 spaces). Accepts wildcards and lists. Accepts exclusions.
> 
> Am I missing something?
> 
> Thanks,
> 
> Anthony Lomax
> 
> -- 
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> 
> 
>    Anthony Lomax 
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