[webservices] GainUnits in StageSensitivity

[Yazan Suleiman]

Hi Phillip

GainUnits should not be empty when not available.  I will open a bug.  Thanks


On Oct 28, 2011, at 8:28 AM, Philip Crotwell wrote:

> Hi
> 
> For the resp level output from this URL:
> http://www.iris.edu/ws/station/query?net=CO&sta=PAULI&loc=00&chan=HHN&level=resp
> The Stage 2 response consists of just a <StageSensitivity> which has a
> empty <GainUnits/> element. All of the other stages also have
> sensitivities with the <GainUnit> but it is filled in with the same
> value as the <InputUnits> of the stage.
> 
> <Response stage="2">
>  <StageSensitivity>
>    <SensitivityValue>1</SensitivityValue>
>    <GainUnits/>
>    <Frequency>.05</Frequency>
>  </StageSensitivity>
> </Response>
> 
> 
> Two questions, first, why is stage 2's <GainUnits> empty?
> 
> Second quesiton, what is <GainUnits> supposed to represent? The docs
> only say  that the <StageSensitivity> represents a seed blockette58,
> but there are no units in a B58. I assume the units go with the
> <SensitivityValue> and not with the <Frequency>, but that is not
> clear.
> 
> I guess to me this field feels like this is redundant information
> within the stage. It is optional, so perhaps the station web service
> should not populate it. Unless it serves some purpose I can't see,
> maybe it should be remove from the schema???
> 
> Just for reference, here is the equivalent stage 2 in resp format. It
> appears to be useless information here as the whole stage consists of
> nothing but a unity gain. So I guess it really doesn't belong in the
> response in the first place, but there it is...
> #
> #                  +-----------------------------------+
> #                  |      Channel Sensitivity/Gain     |
> #                  |        CO  PAULI  00  HHZ         |
> #                  |     04/26/2011 to 12/31/2599      |
> #                  +-----------------------------------+
> #
> B058F03     Stage sequence number:                 2
> B058F04     Sensitivity:                           +1.00000E+00
> B058F05     Frequency of sensitivity:              +5.00000E-02
> B058F06     Number of calibrations:                0
> #
> 
> thanks,
> Philip
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