Re: Proposal for changes to unify response elements
Stephane Zuzlewski
Your proposal makes sense; having some consistency would be desirable.
The least invasive change is probably to assign NumeratorCoefficient with
"number" instead of "i" and to number Numerator & Denominator as well.
Stephane
On 7/14/15 9:48 AM, Philip Crotwell wrote:
>
> Hi
>
> I have another proposal to update FDSN StationXML and wanted to toss
> it out.
>
> 1) Change NumeratorCoefficient in FIRType to use attribute "number"
> instead of "i" and add attribute "number" to Numerator and Demoninator
> in CoefficientsType.
>
> Currently
> PoleZero in PolesZerosType are numbered with "number",
> NumeratorCoeffiecient is numbered in FIRType with "i",
> Numerator and Demoninator are not numbered in CoefficientsType,
> Coefficient is numbered with "number" in PolynomialType
>
> It would be nice if these were all uniform. Probably all coefficients
> should be numbered or none, and would be nice if the names were the
> same, using "number" instead of "i". Mathematically, the poles and
> zeros don't really need to be numbered as they are just multiplication
> and commute, but order matters for coefficients. Could consider
> removing "number" from PoleZeroType.
>
> 2) Change NumeratorCoefficient in FIRType and Numerator and
> Demoninator in CoefficientsType to FloatNoUnitType.
>
> Currently
> PoleZeroType is FloatNoUnitType
> FIRType NumeratorCoefficient is xs:double,
> CoefficientsType Numerator and Demoninator are FloatType,
> PolynomialType Coefficient is FloatNoUnitType
>
> and it would be good if all of these were treated the same.
>
> The attribute change (1) would cause a change in code, but in many
> cases I think the FloatNoUnitType (2) would probably not require any
> code changes on existing clients or servers.
>
> A github pull request is here:
>
> https://github.com/FDSN/StationXML/pull/1
>
> thanks,
> Philip
>
>
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Stephane Zuzlewski University of California, Berkeley
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