[OHM] Some mapping questions

[P]

 [I sent this message on 2020-08-05 but it was too big because of the
quotation]

Hi,

referring to uncertain dates:

At the moment, there is unluckily the incentive to use exact start and
end_dates even if it is not known. That's a bit discomforting to me.

I also would advise against the procedure to enter an approximate - but
technically exact - start_date with a note that it is approximative.
Instead we should agree on one form of tagging of uncertain time ranges and
then strongly recommend to use it if there is uncertainty. Is there
anything speaking against the form "1900-03-07..1905-04-09" / "1900..1905"?
Maybe machine reading issues?

Further, there is the question of rendering: The idea, that the time slider
should process an average date sounds not that bad, but in many cases, a
start_date-range is very big. For example, when there is a single dated
photo/map where a building appears. It could be built any time before that
photo/map was created. Computing an average date out of 0..1905 or
something doesn't make sense in my opinion. To give some more possibilities
at least: There could be the option to show "maybe-objects" or not. If it
is activated, in the years 0 to 1905 the building is shown, if not, it will
appear on the map in the time slider year 1905 and after. Further, objects
could be given a mark (colouring; higher transparency; a question mark
symbol; ...) during the period in question.

As you see, I neither have a perfect solution, but we should discuss that
topic with some priority because there is the danger that many objects get
a seemingly but incorrect exact date as a result of mapping for the
renderer.

Kind regards,
Paul
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