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Hi All,</div>
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Apologies that I have not been following this in detail but whilst I agree with Mark that 1.10 is not a realistic use case, selection by uv coverage is, but just the number of antennas and extrema of baseline lengths is not enough. On the other hand, often
all archives provide is baseline length (or even just antenna positions), frequency, pointing direction and observation duration. Metrics related to uv coverage density can then easily be calculated (as in the L5 and L80 etc. metrics in the ALMA archive)
but I don't know if this is commonly seachable directly for any archive. So it is not just a matter of what is commonly searched for, but also what archives provide and how much there can be an interface to convert the latter to the former.<br>
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thanks</div>
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Anita<br>
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<span style="font-size: 10pt;">-------------------------------------------------------------------------------------------------------</span></div>
<div style="font-family: Tahoma; font-size: 13px;"><span style="font-family: "Century Gothic", sans-serif; font-size: 10pt;">Dr. A.M.S. Richards</span></div>
<div style="font-family: Tahoma; font-size: 13px;"><span style="font-family: "Century Gothic", sans-serif; font-size: 10pt;">Senior visiting fellow, JBCA, University of Manchester, M13 9PL
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<span style="font-family: "Century Gothic", sans-serif; font-size: 10pt;">a.m.s.richards@manchester.ac.uk (please do not use old @jb.man.ac.uk email)</span></div>
<div style="font-family: Tahoma; font-size: 13px;"><span style="font-family: "Century Gothic", sans-serif; font-size: 10pt;">I work the hours which suit me. I do not expect instant replies, I respect whatever hours you work.</span><br>
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<div id="divRplyFwdMsg" dir="ltr"><span style="font-family: Calibri, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);"><b>From:</b> Radioig <radioig-bounces@ivoa.net> on behalf of Mark Kettenis <kettenis@jive.eu><br>
<b>Sent:</b> 10 November 2023 14:28<br>
<b>To:</b> BONNAREL FRANCOIS <francois.bonnarel@astro.unistra.fr><br>
<b>Cc:</b> radioig@ivoa.net <radioig@ivoa.net><br>
<b>Subject:</b> Re: [Radioig] ObsCore extension last news</span>
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<div><span style="font-size: 11pt;" class="elementToProof">> Date: Wed, 8 Nov 2023 20:55:17 +0100<br>
> From: BONNAREL FRANCOIS <francois.bonnarel@astro.unistra.fr><br>
><br>
> Dear all,<br>
<br>
Hello Francois,<br>
<br>
> 2 )<br>
> <a href="https://urldefense.com/v3/__https://wiki.ivoa.net/internal/IVOA/ObsCoreExtensionForRadioData/ADQLusecasesForObsCoreExtensionForRadioData.pdf__;!!PDiH4ENfjr2_Jw!HyhwwRr7kABYG1-TlUUEvWs38ey-0cYDZYKmOpN-45ssDSu_Y5Zvz0S34Ay1is-fowGJTFJKOATDwFcTBpZd-YkoSWM9$" id="OWA6b86d7f7-5a1d-5e2c-a7ee-fe570ce046bb" class="OWAAutoLink" data-auth="NotApplicable">
https://urldefense.com/v3/__https://wiki.ivoa.net/internal/IVOA/ObsCoreExtensionForRadioData/ADQLusecasesForObsCoreExtensionForRadioData.pdf__;!!PDiH4ENfjr2_Jw!HyhwwRr7kABYG1-TlUUEvWs38ey-0cYDZYKmOpN-45ssDSu_Y5Zvz0S34Ay1is-fowGJTFJKOATDwFcTBpZd-YkoSWM9$</a> [wiki[.]ivoa[.]net]<br>
<br>
Thanks. It is good to have these ADQL examples. But I think we need<br>
a scientific use case associated with these ADQL examples as well. I<br>
still think the current set of additional columns is larger than it<br>
should be as there is overlap between e.g. the ones that characterize<br>
the uv coverage and the ones that characterize the field of view<br>
and/or resolution. I think we should drop the ones for which we do<br>
not of have a scientific use case (including an ADQL example).<br>
<br>
Another somewhat questionable example is use case 1.10. The minimum<br>
number of antennas for a "good" observation really is<br>
instrument-specific and the maximum distance between antennas really<br>
is just a very poor way of expressing a resolution or uv-coverage<br>
constraint for which we already have columns. So unless someone can<br>
come up with a scientific use case for these parameters, I think they<br>
should be dropped from the extension.<br>
<br>
Thanks,<br>
<br>
Mark<br>
<br>
<br>
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