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<p>Dear Ssig, Apps and VESPA members<br>
</p>
<p>As you probably saw, we have more and more Solar System resources
available in the VO.<br>
This is a really good news (notably hanks to Europlanet effort)<br>
</p>
<p>But for client point of view, and notably Aladin, it is more and
more difficult to display and use correctly these new resources as
there is presently no standard way to specify the celestial body
concerned by each of these resources. Actually, in Aladin, we are
face to two issues :</p>
<ol>
<li>How to build correctly the data discovery tree ? Concretely,
how to move the good TAP, CS and other services to the Solar
System branch ?</li>
<li>How to handle the incompatible projections (sky resources over
planets, or the opposite, or Mars data over Io, etc...) ?</li>
</ol>
<p>I progressed a little. For the first point, I made a very bad
hack based on the ivoid. We're lucky, most solar system resources
use EPN-core + DACHS server... and DACHS automatically uses an
ivoid containing the substring "/epn". By magic, 35 resources are
now placed in the Solar System branch. I also had to manually add
3 others resources ( jacobsuni/tap, pvol/tap andÂ
vo-plasma.oeaw.ac.at/tap). The result is not bad (see below) but
this method is clearly debatable. And there is no distinction
between planets.<br>
</p>
<p>For the second point, I have not found a solution. Only Solar
System HiPS maps have a dedicated keyword for each body. But as
it is not the case for other resources of the Solar System, I can
not presently use this keyword.</p>
<p><b>So the question : How to characterize Solar System resources
in the VO ? </b><br>
</p>
<ol>
<li>For the VO registry, do we have to invent a dedicated field
such as <obsbody>mars</obsbody> ?</li>
<li>For TAP tables, how to specify that this table concerns this
body, or the sky ?</li>
<li>How to handle the list of celestial bodies ? Do we have to
provide a list (mercury, venus, earth, moon, mars, io,...)
somewhere in the VO ?<br>
</li>
</ol>
<p>Reactions ? Suggestions ? Do we have time to discuss this point
during Paris Interop ?<br>
Cheers<br>
Pierre Fernique<br>
</p>
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<p><img src="cid:part1.5DF2A65D.3EF35516@astro.unistra.fr" alt=""></p>
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