21 June Meeting

Karl Grossner

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Jun 13, 2022, 10:29:48 AM6/13/22

to Linked Places

Hello all,

As it turns out I will be in transit all day on 21 June, and in the air at our set time of 4p CST. If someone wants to volunteer to co-host, I can set that now. Please let me know, on here or directly.

Thanks, and sorry for the disruption

Karl

Karl Grossner

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Jun 13, 2022, 1:19:27 PM6/13/22

to Tom Gheldof, linked...@googlegroups.com

I meant CEST - Central Europe Summer Time

Sorry about that

On 6/13/22 5:34 PM, Tom Gheldof wrote:

Dear Karl,

4pm CST, meaning 11pm CET? Not sure if I can make it then, although it might be that I’m mistaken because of the conversion :-)

Best,

Tom

Tom Gheldof

Scientific researcher Trismegistos

Ancient History, Faculty of Arts
Blijde Inkomststraat 21 bus 3307
3000 Leuven
tel. +32 16 37 24 95
www.trismegistos.org

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Karl Grossner

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Jun 15, 2022, 1:10:44 PM6/15/22

to Linked Places

After some discussion with a couple of y'all, it makes the most sense that we cancel this month's meeting. The next will be 19 July, at 4p CET as usual.

In the meantime I have put a few thoughts together about the uncertainty issue that was to be an agenda topic (along with Stephen's broad question of scope for this working group). So here are those thoughts...comments, suggestions and polite brickbats always welcome!

--------------------

I thought it would be good to see whether there are new and useful insights in recent literature on representing uncertainty in models and visualizations, so I tweeted a request for recommendations and got a few. The first two are ~20 year old favorites from GIScience.

What are others? Is this a useful exercise at this point?

Some background…In 2013 I undertook a project called Topotime with colleague Elijah Meeks at Stanford Libraries. The humanities projects we consulted on there had myriad requirements for modeling and visualizing temporality, so we dove in, no holds barred: seasons, cyclical time, uncertain-interval-within, etc. etc. The work got a very favorable reaction every time I presented it, but when I solicited example datasets to work with I got no offers. Then the Library of Congress developed EDTF (ExtendedDate Time Format), covering much of the ground we had worked on, so I scaled my aspirations way back and began advocating only for the use of 4-part expressions for timespans (earliest start, latest start, earliest end, latest end) – in particular, adding them to GeoJSON. Those found use in the GeoJSON-T and Linked Places formats, and PeriodO uses them as well. They provide formal expression of one type of uncertainty.

When LPF was being developed we (me, Rainer, Richard Light, Graham Klyne) considered having it support at least Level 1 of EDTF, but thought better of it because there was no evidence any gazetteer datasets making their way to WHGazetteer or Peripleo at the time would or could include operators like “?” for uncertain, “~” for approximate, or “%” for both. And LPF was built for the use cases of those projects.

So the options I see (what are others?) are:

reconsider Level 1 EDTF for LPF (e.g. ?, ~, % appended to any ISO8601 string in any “when”, e.g. "1832-04~" = approximately April, 1832)
extend “when” with this (already in geometries)
- “when”: {“certainty”: [“certain”|”less certain”|”uncertain”], …}

OR

·allow e.g. “when”: {“certainty”: 0.3, … } in both “when” and geometries (whether standalone or in a GeometryCollection, replacing the previous)

cheers, Karl

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