[webservices] irisFetch.Traces returning duplicate values for unique SNCL-time

[Rob Newman]

Hi Mary,

In the examples you have given, in the case of CI_PASC you are specifying a channel and location code. With IC_ENH you are not specifying either, you wouldn't you expect more than one record (or in Matlab language, structure of 1x2 arrays)? Maybe try specifying a channel and/or loc code and see what you get back.

Best regards,
- Rob N


On Feb 7, 2013, at 3:01 PM, Mary Templeton wrote:

> Hello,
> 
> 	I'm running a matlab amplitude check on GSN stations for the recent Santa 
> Cruz Islands event.  I've done this for past event of M>=7 with no problem.
> 
> 	Today my routine is failing because the structure returned by irisFetch.Traces 
> for IC.ENH.00.BHZ (for example) is a structure of 1x2 arrays having duplicate 
> values rather than a structure of single values.  I'm not getting this behavior with 
> CI.PASC.00.BHZ.  
> 
> Here's what I'm used to:
> 
>>> net='CI'
> net =CI
>>> sta='PASC'
> sta =PASC
>>> loc='00'
> loc =00
>>> chan='BHZ'
> chan =BHZ
>>> starttime
> starttime =2013-02-06 01:12:35
>>> endtime
> endtime =2013-02-06 03:12:35
> 
>>> primary = irisFetch.Traces(net,sta,loc,chan,starttime,endtime)
> primary = 
>                 network: 'CI'
>                 station: 'PASC'
>                location: '00'
>                 channel: 'BHZ'
>                 quality: 'M'
>                latitude: 34.1714
>               longitude: -118.1852
>               elevation: 341
>                   depth: 0
>                 azimuth: 0
>                     dip: -90
>             sensitivity: 5.9199e+09
>    sensitivityFrequency: 0.0300
>              instrument: 'STS-1'
>        sensitivityUnits: 'M/S'
>                    data: [288000x1 single]
>             sampleCount: 288000
>              sampleRate: 40
>               startTime: 7.3527e+05
>                 endTime: 7.3527e+05
>                   sacpz: [1x1 struct]
> 
> 
> Here's how IC.ENH differs:
> 
>>> net='IC'
> net =IC
>>> sta='ENH'
> sta =ENH
> 
>>> secondary = irisFetch.Traces(net,sta,loc,chan,starttime,endtime)
> secondary = 
> 1x2 struct array with fields:
>    network
>    station
>    location
>    channel
>    quality
>    latitude
>    longitude
>    elevation
>    depth
>    azimuth
>    dip
>    sensitivity
>    sensitivityFrequency
>    instrument
>    sensitivityUnits
>    data
>    sampleCount
>    sampleRate
>    startTime
>    endTime
>    sacpz
> 
>>> secondary.sampleRate
> ans =    20
> ans =    20
>>> secondary.network
> ans =IC
> ans =IC
> 
> etc.
> 
> The only field where the values aren't duplicated is sampleCount:
>>> secondary.sampleCount
> ans =       75712
> ans =       60270
> 
> Is this what you would expect?  If so, can you explain when/why it occurs?  I'm wondering 
> if this is an error or something I need to catch and handle.
> 
> Thanks a bunch,
> Mary Templeton
> 
> 
> 
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_____________________________________________

Rob Newman
Technology Architect, IRIS DMC
[e] rnewman at iris.washington.edu



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