<html><body><div style="font-family: times new roman, new york, times, serif; font-size: 12pt; color: #000000"><div>Greetings,<br></div><div><br></div><div>I've begun trying to extend GeoJSON objects to include reference to the temporal attributes of geographic features alongside their spatial attributes (geometry). I just wrote a little blog post about this (<a href="http://kgeographer.com/wp/joining-space-and-time-in-geographic-features/">http://kgeographer.com/wp/joining-space-and-time-in-geographic-features/</a>). It involves trying to fold in elements of Topotime, which models PeriodCollections; <a href="http://dh.stanford.edu/topotime">http://dh.stanford.edu/topotime</a>, and its handling of uncertain time.<br></div><div><br></div><div>I've approached this two ways: 1) adding a "periods": [ ] array to a GeoJSON FeatureCollection (<a href="https://github.com/kgeographer/catalhoyuk/blob/master/figurine.json">https://github.com/kgeographer/catalhoyuk/blob/master/figurine.json</a>); and 2) adding one or more "temporalExtent": [{}] element of a GeoJSON feature (<a href="https://github.com/kgeographer/catalhoyuk/blob/master/geotemporal_fig.json">https://github.com/kgeographer/catalhoyuk/blob/master/geotemporal_fig.json</a>)<br></div><div><br></div><div>Added to that, I'd like to make this JSON-LD compatible. This isn't a theoretical exercise! I have 200-300k archaeological features to publish as linked data and looking to do it in useful way that adds something to the modeling conversation.<br></div><div><br></div><div>I'd be very interested to hear comments from the GeoJSON development team and user community on this; granted I don't have a full-fledged proposal worked out, but hopefully enough for a discussion.<br></div><div><br></div><div>cheers,<br></div><div>Karl<br></div><div><br></div><div><br></div><div><span name="x"></span><span style="color: #999999; font-size: small;" data-mce-style="color: #999999; font-size: small;" size="2"><span style="font-family: Courier New,courier,monaco,monospace,sans-serif;" data-mce-style="font-family: Courier New,courier,monaco,monospace,sans-serif;">-------------</span><br style="font-family: Courier New,courier,monaco,monospace,sans-serif;" data-mce-style="font-family: Courier New,courier,monaco,monospace,sans-serif;"><span style="font-family: Courier New,courier,monaco,monospace,sans-serif;" data-mce-style="font-family: Courier New,courier,monaco,monospace,sans-serif;">Karl Grossner</span><br style="font-family: Courier New,courier,monaco,monospace,sans-serif;" data-mce-style="font-family: Courier New,courier,monaco,monospace,sans-serif;"><span style="font-family: Courier New,courier,monaco,monospace,sans-serif;" data-mce-style="font-family: Courier New,courier,monaco,monospace,sans-serif;">Digital Humanities Research Developer</span><br style="font-family: Courier New,courier,monaco,monospace,sans-serif;" data-mce-style="font-family: Courier New,courier,monaco,monospace,sans-serif;"><span style="font-family: Courier New,courier,monaco,monospace,sans-serif;" data-mce-style="font-family: Courier New,courier,monaco,monospace,sans-serif;">Stanford University Libraries</span><br style="font-family: Courier New,courier,monaco,monospace,sans-serif;" data-mce-style="font-family: Courier New,courier,monaco,monospace,sans-serif;"><span style="font-family: Courier New,courier,monaco,monospace,sans-serif;" data-mce-style="font-family: Courier New,courier,monaco,monospace,sans-serif;">Stanford,CA US</span><br style="font-family: Courier New,courier,monaco,monospace,sans-serif;" data-mce-style="font-family: Courier New,courier,monaco,monospace,sans-serif;"><span style="font-family: Courier New,courier,monaco,monospace,sans-serif;" data-mce-style="font-family: Courier New,courier,monaco,monospace,sans-serif;">www.kgeographer.org</span><br style="font-family: Courier New,courier,monaco,monospace,sans-serif;" data-mce-style="font-family: Courier New,courier,monaco,monospace,sans-serif;"><br></span><span name="x"></span><br></div></div></body></html>