Hello and thanks for the prompt reply.
@Guillaume: I took your name and a question on fr-wiki and concluded that you were someone who had taken part in the French usage of Kartographer. I was thinking that their solution might be usable for us also. Thus I was looking for someone who was knowledgeable about that solution.
@Deborah: Yes I have done some experiments, and seen the pages you link to. There may be documentation I have not looked at yet though.
It was a question on why our old interactive map did not show a feature that made me look at it right now, but I had looked at it in the spring. At that time I did not have the time to dive deep into it, as I was finishing my final software-project before retiring.
What we have wrt. maps today at no-wiki is the tool originating in de-wiki with a link after the coordinates that expands above the text. It also highlight the object of the article if OSM has added wikipedia info. That map has not been updated for quite some time, thus the recent updates with Wikipedia/Wikidata references are not giving us any reward. That is a reason to move to your new solution.
We are also collecting coordinates from articles in a category that can be shown on a map. Useful both to a user, but also to check for wrong coordinates. This also can collect coordinates within an article to similarly show on the map. This feature it seems is missing in Kartographer, and something that is likely to be an impediment to its acceptance on no-wiki.
In both cases it should however be possible to utilize Wikidata I think. But that would mean that we would have to assemble some geojson from data probably from several Wikidata-objects. Such a solution would gather support on no-wiki for a possible complete replacement. (We already have ever increasing usage of a simple inclusion of {{Infoboks biografi}} for adding an infobox for biographies with data fetched from Wikidata, but not without some bumps. And the templates and modules could do with rewrite/replacement)
It is easy to add a <mapframe> with the necessary data to highlight objects, but although I think I should be able to get the commas right in the json, I don't think that is something that our editors should be expected to do. Thus the need to put everything into a template, probably with a module.
When I experimented I did not find the correct way to add a mapframe from a template, and I have not seen it clearly described in the documentation either.
Regards,
Hans