OpenHistoricalMap

[1ec5]

Is your feature request related to a problem? Please describe. Sometimes uMap is used to visualize historical events as an alternative to the popular ArcGIS StoryMaps service. The default OSM basemap can only portray extant features from the present day, so the user must georectify an old map and overlay it on top of the basemap for reference. While this approach is essential for some historical accounts, it would be great if uMap could provide a built-in alternative to OSM that includes historical geographical data.

Describe the solution you'd like uMap could allow the user to set OpenHistoricalMap as a basemap instead of OSM. Or perhaps it could allow a map to include both OSM and OHM as togglable layers.

Additional context OHM provides an official vector tile server and several premade stylesheets based on these tiles. If you choose to integrate an OHM style into Leaflet via maplibre-gl-leaflet, an interactive time slider is also available as a Leaflet plugin, or a custom one could be implemented in uMap for better integration with the rest of the UI.

#1634 tracks adding support for OSM vector tiles. Perhaps you could work with OHM’s tiles and stylesheets beforehand, so that uMap will be ready once OSM’s vector tiles are available.