<div dir="ltr"><div dir="ltr"><div dir="ltr"><div><div><div><div>Laurent,<br></div><br></div>Thanks for the comment, and I agree.. the distinction between them needs to be very clear.<br></div><br>How about if I add a short glossary in both the Coords and Measurement models.. maybe in the Model section, that defines the 3 terms which are generally involved in the discussion on these objects.<br></div> Quantity: [ivoa model] A number with a unit. <br></div><div> Coordinate: [coords model] An absolute location within a coordinate space. Comprised of a 'value' (often a Quantity), along an associated axis in a coordinate space, and a coordinate frame providing additional metadata about the orientation and origin of the coordinate space.<br></div><div dir="ltr"><div><div><div><div><div><div><div> Measurement: [meas model] For 'measured', or 'determined' data. Combines a Coordinate (ie: the determined value) with corresponding Error(s).<br><br></div>Mark<br><br></div></div></div></div></div></div></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Jun 11, 2019 at 6:04 AM Laurent MICHEL <<a href="mailto:laurent.michel@astro.unistra.fr">laurent.michel@astro.unistra.fr</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Dear all,<br>
<br>
I started to read the STC trilogy by Coords and I think the Coordinate <br>
role needs some clarification.<br>
<br>
It is written (4.1) that a coordinate "... represent an absolute <br>
location within a coordinate space..."<br>
<br>
Having read that, I expect to get here anything describing my <br>
coordinate. But this is not the case; e.g. there no ne error.<br>
<br>
I guess that the Meas model doing the job, and I think that the bridge <br>
between the 2 models must be clearly stated in the document.<br>
<br>
Laurent<br>
<br>
-- <br>
---- Laurent MICHEL Tel (33 0) 3 68 85 24 37<br>
Observatoire de Strasbourg Fax (33 0) 3 68 85 24 32<br>
11 Rue de l'Universite Mail <a href="mailto:laurent.michel@astro.unistra.fr" target="_blank">laurent.michel@astro.unistra.fr</a><br>
67000 Strasbourg (France) Web <a href="http://astro.u-strasbg.fr/%7Emichel" rel="noreferrer" target="_blank">http://astro.u-strasbg.fr/~michel</a><br>
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</blockquote></div>