Open Historical Map/OHM Contributors

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Open Historical Map would not exist without the software contributions of countless people in the OpenStreetMap (OSM) community and the larger OSM ecosystem. The first and foremost credit goes to them. Special credit also goes to those who helped get OHM off the ground.

The list of Data Contributors below is by no means complete, but where possible, the OHM community attempts to credit all those – both individuals and organizations – who have helped build this project. Specifically included are contributors who have requested specific attribution, as well as those whose data licensing dictates they be included.

There is no single "global" copyright or license for the data stored in OHM. Rather, each object contains metadata indicating the terms of its use. So, the license terms of the OHM Contributors should also be found as tags on the OHM data objects the provided.

In a world of interconnected data, the concept of Linked Open Data is critical to the future of this project. It is likely that many geo-focused sources of Linked Open Data, e.g., Pelagios, Pleiades, the World Historical Gazetteer, and the Getty Thesaurus of Geographic Names, may drive the creation of data inside OHM, using data sharing formats such as Linked Places. In addition, LOD sources like Wikidata and Europeana.

Notes on Adding Contributor Attributions

Please be sure to include all appropriate records for attribution, including source of the data, permanent links to any communications authorizing the use of the data (e.g. uploading or storing the communications here on the OHM wiki).

Data Contributor Attributions and Disclaimers

OHM users

OHM users map for a variety of personal reasons and can mark their data at the object (node, way, closed way/area, relation) level. The default license for contributions is CC0.

ANR Communes / The Cambridge Group for the History of Population and Social Structure

A team from ANR Communes and Cambridge University's Group for the History of Population and Social Structure has contributed data to OHM with the tag 'source:name = ANR Communes shapefiles'.

Kartverket (Norwegian Mapping Authority)

Contains data from Kartverket (Norwegian Mapping Authority) released under the CC BY 4.0 licence.

Natural Earth Data

Natural Earth Data is an incomparable provider of natural and cultural geodata with absolutely no copyright restrictions.

The Newberry Library

Atlas of Historical County Boundaries: Dataset (U.S. Compilation: Historical States and Territories) Siczewicz, Peter. U.S. Historical States and Territories (Generalized .0001 deg). Emily Kelley, digital comp. Dataset. Atlas of Historical County Boundaries, ed. by John H. Long. Chicago: The Newberry Library, 2011. Available online from The shapefiles for in this dataset are released under the terms of CC BY-NC-SA 2.5.

The New York Public Library NYC Space//Time Directory

Building Inspector

Data Linking