[OHM] Open Historical map

[PauLL170]

Hi,

i'm already mapping Germersheim and a bit of Trier :) . Regarding
start_date and end_date I was talking about the following: E. g. if you
have a photo from 1983-05-01 with a certain building and one from
1980-07-01 without it, you can set as start_date 1980-07-01..1983-05-01. In
my opinion it is important that the time slider recognizes this form,
because it is often the case. Generally, we will have to think about how to
render this object in this period, in which the building possibly already
have existed. But for now, I just want to suggest that the time slider
recognizes this form in general, as far as it is doable. As a first version
I imagine a check box: "show doubtful objects". If it is activiated, the
"start_date" technically is set 1980-07-01 and if not, it is set 1983-05-01.

Best regards
Paul
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