OpenHistoricalMap

Explore the world throughout history – and local history, and prehistory. The #TimeMachine of maps, created by people like you and dedicated to the #PublicDomain. Charter project of @OpenStreetMapUS and companion to @openstreetmap.

Learn more: osm.wiki/OHM

(Mastodon account run by @jeffme @mxn and bridged as bsky.app/profile/ohm.mapstodon )

#OpenHistoricalMap #OpenStreetMap #DigitalHumanities #OpenData #HGIS

OpenHistoricalMap boosted:
OpenHistoricalMapohm@mapstodon.space
2026-02-03

This is the single largest increase in the average age of an element and the single largest decline in the average year since recordkeeping began in June 2023. That’s actually a good thing: it means we’re mitigating #recentism, bringing more historical balance to our coverage.

A line chart of dates along the X axis from May 2025 to present and average age in years along the Y axis from 110 to 140 years. The series seesaws between 125 and 135 except for a drop toward the latter half of last year to 120 before rebounding to 127 this month.A line chart of dates along the X axis from May 2025 to present and average year along the Y axis from 1920 to 1950. The series mostly stays within the 1930s, steadily rising to the early 1940s in 2025 before a steep drop back to 1938 this month.
OpenHistoricalMapohm@mapstodon.space
2026-02-03

In January, the #OpenHistoricalMap community added 65,731 dated elements, 9,668 buildings, and 15,303½ railroad miles. The average age of a dated element rose by more than 7 years, and the average year shifted more than 4 years earlier. All this with the help of 39 new contributors – welcome!

wiki.openstreetmap.org/wiki/Op

OpenHistoricalMapohm@mapstodon.space
2026-01-23

@richlv @vees If there’s any way to come up with start dates on the data, then it would be a good candidate for an import. Or if there’s newer data that we can diff it against.

OpenHistoricalMap boosted:
selena deckelmannselenamarie@fiasco.social
2026-01-16

Wonderful call to action to academia from Dariusz, a thoughful former board trustee for the Wikimedia Foundation rdcu.be/eYRTA

OpenHistoricalMap boosted:
2026-01-16

Happy 25th Birthday Wikipedia! 🥳 🎂

Wikipedia & OpenStreetMap are open projects & open communities to build a free content, to make the world a better place. ☺️ ☺️

wikimediafoundation.org/wikipe

#Wikipedia #Wikipedia25 #FreeCulture #OpenStreetMap

OpenHistoricalMap boosted:

Snag your early bird #SOTMUS tickets before pricing goes up on Feb. 1. The early bird catches the deal: openstreetmap.app.neoncrm.com/

#StateoftheMapUS #earlybird #OpenStreetMap

OpenHistoricalMap boosted:
2026-01-16

Wikipedia turns 25 today! 🎂📚

To celebrate, we’re looking back at its baby pictures—some of the earliest captures of the site, preserved in the #WaybackMachine.

Take a nostalgic peek at early Wikipedia ⤵️

web.archive.org/web/2003030100

#WikipediaDay #Wikipedia25 @wikipedia

Image with text at the top that reads: "Wayback Machine Then and "WIKIPEDIA.ORG" at the bottom. Below is a Wayback Machine capture of the Cartoon Network website from JUN 8, 2003.
OpenHistoricalMap boosted:
revy :neocat_flag_gay_256: orthogonality@app.wafrn.net
2026-01-16

concept for a historical data science project im working on. europe, 1938.
written with python (osmnx and folium); map data from #openstreetmap and #openhistoricalmap


#openstreetmap #openhistoricalmap
a map of europe in 1938
OpenHistoricalMapohm@mapstodon.space
2026-01-01

In December, the #OpenHistoricalMap community added 55,351 dated elements, 13,877 buildings, and 8,959 railroad miles. The average age of a dated element fell by 8 months, and the average year shifted one year later. All this with the help of 31 new contributors – welcome!

wiki.openstreetmap.org/wiki/Op

OpenHistoricalMapohm@mapstodon.space
2026-01-01

We deeply appreciate all the help that @greeninfo provided over the years. We look forward to spending an unprecedented 2026 with the #HistoricalMapping and @OpenStreetMapUS communities.

OpenHistoricalMapohm@mapstodon.space
2026-01-01

The main #VectorTiles tileset contains route information for more informative transportation map styles. A new tileset contains territories as polygons, so your custom map can color in a country or other administrative region.

A raw view of the data showing route_lines features with indexed tram route attributes.A raw data view of the world highlighting country territories as polygons, showing details about Numidia and France.
OpenHistoricalMapohm@mapstodon.space
2026-01-01
𒆳𒆍𒀭𒊏𒆠
𒌷𒀕
𒋀𒀕𒆠
OpenHistoricalMapohm@mapstodon.space
2026-01-01

If you contribute to @wikipedia @wikidata #WikimediaCommons #Wikivoyage, you can join OpenHistoricalMap in just a few clicks, without having to juggle yet another password for yet another wiki. It works a lot like our existing OpenStreetMap login support.

#SingleSignOn #OAuth2

Hi Example, In order to complete your request, OpenHistoricalMap needs permission to access information about you, including your email address, on all projects of this site. No changes will be made with your account.
OpenHistoricalMapohm@mapstodon.space
2026-01-01

#OSMCha can visualize giant changesets without timing out or throwing an error. No one will sneak another empire into OHM without the community noticing it.

#HowToHideAnEmpire

OSMCha showing a changeset that adds many streets to Mannheim.OSMCha showing a changeset that adds boundaries around the world to the French Empire.
OpenHistoricalMapohm@mapstodon.space
2026-01-01

#scrapers and #crawlers are waging a constant #DDOS on our site and driving up cloud hosting costs. We’re coping, but if it keeps getting worse, will OHM last? 🫠

Protection pack (web ACL) activity: summary of your protection rules and how their order contributes to terminating actions. Block-Old-Chrome-UA, Block-countries, and ipset-block-production siphon off about a sixth of the traffic. Of 53,720 requests, 47,700 are allowed and 6,030 are blocked.
OpenHistoricalMapohm@mapstodon.space
2026-01-01
OpenHistoricalMap boosted:
Carwil Bjork-JamesCarwil@mastodon.online
2025-12-05

Just added my first object to OpenHistoricalMap: the Mississippian and later Cherokee town of Toqua.

#NativeSoutheast

Open Historical Map interface showing a region in eastern Tennessee at 1707 CE. 

Title highlights: Node: Toqua [950 – 1819]

Toqua (Cherokee: ᏙᏉ, romanized: Toquo) was a prehistoric and historic Native American site in Monroe County, Tennessee, located in the Southeastern Woodlands. Toqua was the site of a substantial ancestral town that thrived during the Mississippian period (1000-1600 CE).

 Added prehistoric Native American and Cherokee town
Edited 2 minutes ago by Carwil
Changeset #207314 0
Location: 35.5658732, -84.1696025
OpenHistoricalMapohm@mapstodon.space
2025-12-03

@osm_tech For #GivingTuesday we’ll even make a twofer: OSM’s full history data and *our* full Historical data!

openstreetmap.app.neoncrm.com/

Client Info

Server: https://mastodon.social
Version: 2025.07
Repository: https://github.com/cyevgeniy/lmst