[OHM] Open Historical map

[Peter Cooper]

Hi

I am a member of the Society for One-Place Studies, “where family history and local history unite”. I have been exploring how we might support people doing One-Place Studies (OPS) to use mapping. To this end I have developed a forum (mapping4ops.org) where ideas, experiences, documentation etc can be be logged, and a prototype mapping system M4OPS (Mapping for One-Place Studies - mapping4ops.org/M4OPS) . On M4OPS we have a number of studies, each with both current and historic maps that we can layer over each, together with features from data that our researches uncover. Technically M4OPS use OpenLayers4, and we are able to cope with inputs from lots of different sources, and in different formats, as well as create our own. 



Knowing we have similar but different aims, when I started out I did try reaching out to the OHM mailing list, and had a few responses. I have not seen many posts on the OHM mailing list until recently, so I was not sure how active the group are.



While I am always happy to talk generally about mapping and local history, in the current discussion I thought I would mention what I have tried out for time sliders in case it is of interest. You can see an example in the last section of my demo system (click on Next for more explanation).



Because I come from the genealogical world I personally use GEDCOM* style dates (1924, MAR 1876, BEF, AFT, FROM, ABT etc) in my databases (eg for people, events, buildings, relationships). Although not perfect, and initially hard to program for, these do give all the flexibility I need. A few of us on the forum have discussed some of the issues (eg here), but I cannot pretend to have solved them yet. I have not yet enabled our time slider to cope with all the flexibility of GEDCOM dates.



Peter Cooper



* For anyone not familiar with GEDCOM the current version (v5.5) is from the 1990's, is far from perfect, and is very widely used. For various reasons (eg RootsWeb being unavailable) the specification is a bit difficult to work with at present. One description is here, and the (very comprehensive) GEDCOM X proposal is here..





From: PauLL170 
Sent: Sunday, May 6, 2018 11:19 AM
To: Jeff Meyer 
Cc: historic at openstreetmap.org ; Jonathan Masur 
Subject: Re: [OHM] Open Historical map

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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