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<p>Hello all</p>
<p>ISO 19111:2019 (Referencing by coordinates) already includes the
timestamp of coordinates. The standard defines a <tt>CoordinateMetadata</tt>
class with two properties:</p>
<ul>
<li><tt>crs</tt>: Identifier of the coordinate reference system to
which a coordinate set is referenced.</li>
<li><tt>coordinateEpoch</tt>: Epoch at which coordinate referenced
to a dynamic CRS are valid.</li>
</ul>
<p>ISO 19107 (the standard that defines geometry objects) has been
revised. I did not yet had a chance to look closely at it, but
last time I attended to the discussions at OGC my understanding
was that the new geometry objects would be associated to ISO 19111
<tt>CoordinateMetadata</tt> class (and consequently include the
coordinate epoch) instead than to only the CRS.</p>
<p>Simple features are derived from ISO 19107 by the same author. I
think I have seen emails on OGC mailing list about drafts
available, but did not yet had a chance to look at them. At least,
the current Simple Feature editor is well aware of this coordinate
epoch topic since he was present at OGC meetings that debated
about it. So I guess there is good chances that coordinate epoch
will be present in some way in simple features (but did not
verified).</p>
<p> Martin</p>
<p><br>
</p>
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