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<p>Hello Heig members, </p>
<p>In order to prepare the discussion about UCDs tomorrow, <br>
here is a short summary of were we stand in the UCD proposal and
the discussions with the Semantics WG: <br>
</p>
<p><i>Reminder : </i></p>
<p>We must keep in mind that the UCD vocabulary helps to <i>categorize</i>
the quantities or labels or information present in a table
column. <br>
It is not a data model class attribute , which is designed
specificaly for the domain it is used for . <br>
<br>
UCDs are used in tables stored as VOTable, either in data tables ,
like in the Vizier catalog tables for instance , <br>
or in metadata tables like in TAP query responses ( as in ObsTAP)
or Cone search response, for instance. </p>
<p>For the various UCDs discussed in this group , they deal with : <br>
</p>
<ul>
<li><b>event</b></li>
</ul>
For an event_list data set, expressed as a table , column names
describe the kind of quantities recorded for an event and can be
tagged by a UCD .
<p>The event_list table has one event per row , with all quantities
values in the various columns. <br>
<br>
In order to designate an high energy event, we have proposed <i>obs.event</i> together
with Bruno and the semantics chairs in december 2025.<br>
See here the corresponding issue : <a moz-do-not-send="true"
href="https://github.com/ivoa/HighEnergyObsCoreExt/issues/48">https://github.com/ivoa/HighEnergyObsCoreExt/issues/48<br>
<span
style="caret-color: rgb(31, 35, 40); color: rgb(31, 35, 40); font-family: "Mona Sans VF", -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji"; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none; display: inline !important; float: none;">S
obs.event Related to a signal messenger detection
(photon or particle)</span></a></p>
<p>It does not define what an event is ( this is up to the data
model) but it says how to relate a quantity to an event .</p>
<p>then columns related to an event can be tagged with </p>
<p>column name | ucd <br>
event_id meta.id;obs.event<br>
event_type meta.code.class;obs.event<br>
event_grade meta.code.class;obs.event</p>
<ul>
<li><b>pha</b></li>
</ul>
Thanks to Ian for the example about PHA quantities related to an
event:
<p>see <a moz-do-not-send="true"
href="https://github.com/ivoa/HighEnergyObsCoreExt/issues/39"
class="moz-txt-link-freetext">https://github.com/ivoa/HighEnergyObsCoreExt/issues/39</a> <br>
<a moz-do-not-send="true"
href="https://github.com/ivoa/HighEnergyObsCoreExt/issues/39#issuecomment-4208293821"
class="moz-txt-link-freetext">https://github.com/ivoa/HighEnergyObsCoreExt/issues/39#issuecomment-4208293821</a><br>
</p>
<p>I have tried to tag the UCDs corresponding to the various
columns <br>
using <i>instr.pulse </i>suggested above in the issue thread. <br>
<br>
Most of the quantities can be UCD anotated as shown in this issue.</p>
<p>A problem remains for :</p>
<p><span
style="caret-color: rgb(31, 35, 40); color: rgb(31, 35, 40); font-family: "Monaspace Neon", ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace; font-size: 11.9px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: break-spaces; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgba(129, 139, 152, 0.12); text-decoration: none; display: inline !important; float: none;">pi pulse invariant amplitude, calculated from energy (and therefore pha), this value is needed to compute the rmf</span></p>
<p>Can we clarify this quantity? </p>
<ul>
<li><b>phys.flux/ phys.flux.density</b> work in progress (B.
Khelifi)<br>
to be discussed further </li>
</ul>
<ul>
<li><b>phys.particle</b> a VEP has been proposed at <br>
<a moz-do-not-send="true"
href="https://voparis-gitlab.obspm.fr/vespa/ivoa-standards/semantics/vep-ucd/-/blob/master/VEP-UCD-26-particle_types.txt"
class="moz-txt-link-freetext">https://voparis-gitlab.obspm.fr/vespa/ivoa-standards/semantics/vep-ucd/-/blob/master/VEP-UCD-26-particle_types.txt</a></li>
</ul>
Cheers, Mireille<br class="Apple-interchange-newline">
<br>
<p><br>
</p>
<pre class="moz-signature" cols="72">--
--
Mireille Louys, MCF (Assistant Professor)
Centre de données Astronomiques (CDS) Equipe Images, ICube
Observatoire de Strasbourg Telecom Physique Strasbourg
11, rue de l' Université 300, Bd Sebastien Brandt CS 10413
F-67000 Strasbourg F-67412 Illkirch Cedex</pre>
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