As the name suggests, OpenHistoricalMap is OpenStreetMap’s sister project for collaboratively mapping history. It would be great if Kartographer could include OHM in its “External maps” sidebar that links to third-party maps including OSM.

Use case(s)

For a typical wiki that installs Kartographer, historical maps would be an important genre of maps alongside the other genres currently listed. For example, Kartographer maps often appear anachronistically on articles about historical events or long-gone places. The reader should be able to navigate easily to OHM’s coverage of the time period to supplement the modern-day geographical coverage provided by the default map layer.

Benefits

Getting first-class support for OHM tiles into Kartographer would require complex infrastructural work. A simpler link will facilitate access to OHM’s historical coverage in the meantime. The list already includes GeoHack, which in turn links to OHM (as long as you’re on the English Wikipedia or some other Wikipedia language editions that have manually added OHM to their Template:GeoTemplate). However, only a relative handful of longtime users would recognize GeoHack by name; few would suspect it as a convenient shortcut to historical maps.

Implementation notes

Adding OHM to the list appears to entail adding an entry to externalLinks.json, then adding a localizable string for the name of the service.

		{
			"id": "openhistoricalmap",
			"featured": true,
			"links": [
				{
					"type": "historical",
					"url": "https://www.openhistoricalmap.org/?mlat={latitude}&mlon={longitude}&zoom={zoom}&layers=O"
				}
			]
		}

	"kartographer-linktype-historical": "Historical maps",
	"kartographer-link-openhistoricalmap": "OpenHistoricalMap",