BAND question

[Markus Dolensky]

Quoting Alberto Micol <Alberto.Micol at eso.org>:

> 
> Hi Doug,
> 
> I was trying to understand how I should
> implement the search engine using the BAND parameter.
> 
> Suppose that the query says BAND := 5E-7/5.5E-7
> 
> I do have datasets in my archive with a bandpass extending from  
> 4.8E-7 to 5.1E-7
> and others with a bandpass going from 5.1E-7 to 5.4E-7.
> 
> The first set of datasets hence have a bandpass that intersects the  
> required one,
> while the second set has a bandpass that is fully immersed into the  
> required BAND.
> 
> Which ones should I return? Both or only the second set?
> That is, does intersection suffice?
> 
> Or instead should simply be the typical wavelength (central  
> wavelength however defined)
> that should match the constraint? (in which case some datasets of my  
> first set might
> match and others might not if their central wavelength is defined  
> differently)
> 
> So, shall the data provider work with BOUNDS or LOCATIONs (in char  
> speak) to answer
> a BAND query?
> 
> Whatever the answer, it would be useful to describe this in the  
> document,
> so that we get consistent results from different data centres.
> 
> Thanks,
> 
> Alberto
>