OpenStreetMap

OpenStreetMap (OSM) is a global collaborative mapping project whose central asset is an openly licensed geographic database. It allows contributors to collect, edit, verify, and update information about roads, paths, buildings, addresses, land use, transit infrastructure, businesses, natural features, and many other objects. The project is commonly experienced through the OpenStreetMap website, but the brand also encompasses the underlying data, editing tools, application programming interfaces, rendering infrastructure, community events, and a broad ecosystem of commercial, public-sector, humanitarian, and research users. The project was started in the United Kingdom in 2004 by Steve Coast in response to restrictions and perceived limitations surrounding access to geographic data. Rather than operating as a conventional map publisher, OpenStreetMap uses a distributed contribution model. Volunteers and professional contributors can survey places, trace features from permitted aerial imagery, import compatible datasets, add local knowledge, and review one another's edits. The resulting database is maintained as a continuously changing collection of geographic objects rather than as a single fixed map image. OpenStreetMap data is generally distributed under the Open Data Commons Open Database License (ODbL). The license permits reuse, including commercial reuse, subject to conditions such as attribution and, in relevant circumstances, sharing adapted databases under the same or a compatible license. Individual contributions may also be subject to separate contributor terms. This licensing model has made OSM useful to companies building navigation, logistics, delivery, travel, real-estate, mobility, gaming, and location-based services, as well as to governments, universities, and nonprofit organizations. The OpenStreetMap Foundation (OSMF), incorporated in 2006, supports the project by holding infrastructure, administering services and grants, promoting the database, supporting the community, and providing organizational governance. It does not own every local mapping activity or control all software that uses OSM data. The project remains dependent on a large volunteer community, organized local chapters and communities, mapping conferences, and independent operators of derivative services. Key public-facing and ecosystem components include the OpenStreetMap website and web editor, the iD browser editor, the Java OpenStreetMap Editor (JOSM), the main editing API, downloadable planet data, tile-rendering services, and geocoding and routing projects built on OSM data. Nominatim is a prominent OSM-based search and geocoding system, while many routing, visualization, and quality-assurance tools are developed outside the core foundation. The distinction between the OpenStreetMap database and third-party services is important: OSMF operates selected infrastructure, but it does not guarantee every map, application, tile server, or commercial product that uses OSM data. OpenStreetMap's coverage and quality vary by region and feature type. Dense urban areas may have extensive building, address, accessibility, and business information, while other areas may be sparse or outdated. The open contribution model enables rapid local updates and disaster response, but it also creates challenges involving vandalism, inconsistent tagging, duplicate data, licensing compliance, server capacity, privacy, and uneven contributor representation. Despite these limitations, OSM has become one of the most important open geographic-data projects internationally and a foundational data source for many digital mapping products.

OpenStreetMap began in 2004 when Steve Coast created a project intended to provide a freely usable alternative to proprietary and restricted geographic datasets. The first activity focused on building a contributor-driven map of the United Kingdom, where access to detailed national mapping data had historically been constrained. The project adopted a wiki-like model in which registered users could add and edit geographic features, allowing local knowledge to become a central source of map improvement. During its early years, OpenStreetMap developed both a database and a social infrastructure. Contributors created tagging conventions, editing software, import procedures, mailing lists, local communities, and annual mapping events. The project expanded beyond the United Kingdom as users mapped roads, trails, buildings, addresses, waterways, and points of interest worldwide. Its open data model made it especially attractive to developers and organizations that wanted to create services without depending entirely on a single commercial map supplier. The OpenStreetMap Foundation was incorporated in 2006. The foundation's role was to support the project rather than function as a traditional map publisher. It helped maintain servers and domains, organized legal and administrative support, promoted the database, and provided a formal structure for interactions with institutions and sponsors. Governance remained community-oriented, with members and elected board directors participating in foundation decisions while many technical and mapping activities continued to occur independently of the foundation. A major technical and legal transition occurred in the late 2000s and early 2010s. The community replaced the project's earlier Creative Commons database licensing arrangement with the Open Data Commons Open Database License. The ODbL was selected because it was designed specifically for databases and clarified the rights and obligations associated with extracting, reusing, and adapting geographic information. The transition was completed in 2012, although the project continued to address contributor permissions and compatibility questions as part of normal data governance. OpenStreetMap's importance grew through a combination of improving coverage, better editing tools, and external use. The browser-based iD editor lowered the barrier to contribution, while JOSM offered advanced capabilities for experienced mappers. Data consumers developed tile layers, search systems, routing engines, mobile applications, statistical tools, and specialized geographic products. Nominatim became a widely known OSM-based geocoding project, although its public capacity and usage policies differ from the database itself. Commercial organizations also began incorporating OSM into logistics, mobility, navigation, travel, real-estate, and location intelligence products. Humanitarian mapping became one of the project's most visible applications. Following disasters and other crises, volunteers have used satellite imagery, local information, and remote mapping to update roads, buildings, settlements, and facilities. The Humanitarian OpenStreetMap Team developed this work into a more structured program involving tasking systems, training, partnerships, and field operations. OSM data has also supported public-health, development, accessibility, transportation, and environmental projects. The project has faced persistent operational and governance challenges. Maintaining a globally available editing API, tile services, websites, and large data distribution systems requires significant infrastructure and funding. The open editing model can produce vandalism, accidental changes, inconsistent tagging, and disputes about imports or local conventions. The community has also debated contributor diversity, the balance between volunteer and corporate participation, the responsibilities of large data users, and the scope of foundation governance. These issues have not changed the basic model: OpenStreetMap remains a distributed project in which the database is open, continuously edited, and used by a wide ecosystem rather than being a single conventional software product. By its twentieth anniversary in 2024, OpenStreetMap had become a globally recognized source of open geographic information. Its continuing development depends on volunteer mapping, local communities, institutional and commercial support, foundation infrastructure, open-source tools, and responsible downstream reuse. The project remains active, with data quality and feature coverage varying by location and with new applications continually being built on top of its database.

• 2024

  Twentieth anniversary

  [7]OpenStreetMap twentieth anniversaryblog.openstreetmap.org

  OpenStreetMap marked twenty years of collaborative mapping and international community development.

• 2020

  OpenStreetMap Foundation governance debate

  [11]OpenStreetMap Foundation governance debateblog.openstreetmap.org

  The foundation and community held extensive discussions about board governance, corporate participation, diversity, and the relationship between OSMF and the wider project.

• 2013

  iD becomes a major browser editing tool

  [10]iD becomes a major browser editing toolwiki.openstreetmap.org

  The iD web editor helped make contribution easier for newer users while JOSM continued to serve advanced mapping workflows.

• 2012

  ODbL license transition completed

  [5]The license change is completeblog.openstreetmap.org

  OpenStreetMap completed its migration to the Open Data Commons Open Database License.

• 2010

  Humanitarian mapping gains global visibility

  [9]Humanitarian mapping gains global visibilityhotosm.org

  Large-scale mapping after the Haiti earthquake demonstrated how distributed contributors could produce useful geographic information during a crisis.

• 2007

  First State of the Map conference

  [8]First State of the Map conferencestateofthemap.org

  The first State of the Map conference created a recurring international forum for contributors, developers, users, and organizations involved with OSM.

• 2006

  OpenStreetMap Foundation established

  [2]OpenStreetMap Foundation: Aboutwiki.osmfoundation.org

  The nonprofit foundation was incorporated to support OpenStreetMap's infrastructure, community, promotion, and governance.

• 2004

  Project launched

  [3]OpenStreetMap historywiki.openstreetmap.org

  Steve Coast started OpenStreetMap in the United Kingdom as a collaborative alternative to restricted geographic data.

Open, community-maintained geographic data and infrastructure that can be reused by individuals, public institutions, nonprofits, researchers, and businesses under an open database license.

• Open geographic data · 2004

  OpenStreetMap database

  The core product is a continuously edited database of geographic objects, including transportation networks, buildings, addresses, land use, natural features, boundaries, amenities, and points of interest. Data can be downloaded in regional extracts or as planet-scale files and reused under the Open Data Commons Open Database License, subject to attribution and share-alike requirements for applicable derivative databases.

• Web mapping platform · 2004

  OpenStreetMap.org

  The official website provides a browsable map, search and basic interaction features, account functionality, contribution documentation, and access to editing workflows. Its rendered map is one presentation of the underlying database; independent organizations may create different visual styles, tile layers, and applications from the same data.

• Browser-based map editor · 2013

  iD

  iD is an open-source editor integrated into the OpenStreetMap website. It is designed to let contributors add and modify map features in a browser, with forms, presets, imagery support, and validation assistance. Its relatively accessible interface has made it an important entry point for new contributors, while complex workflows may use more advanced desktop tools.

• Desktop map editor

  JOSM

  The Java OpenStreetMap Editor is a powerful desktop application for experienced contributors. It supports detailed editing, imagery and data-layer management, validation, presets, plugins, and workflows involving large or complex changesets. JOSM is an independent open-source tool closely associated with the OSM editing ecosystem rather than a conventional proprietary product.

• Geospatial API

  OpenStreetMap Editing API

  The editing API enables authenticated applications and editors to read and modify OpenStreetMap map data through structured requests. It is intended for editing the main database and is subject to usage policies, rate limits, and operational safeguards. It should not be confused with every third-party API that distributes OSM-derived data.

• Geocoding software

  Nominatim

  Nominatim is an open-source search and geocoding system that uses OpenStreetMap data to convert between place descriptions and geographic coordinates. Public instances and independently operated deployments differ in capacity, configuration, and acceptable use. Nominatim is part of the broader OSM software ecosystem, not a guarantee of unlimited geocoding service from the foundation.

• 2020Mapping during the COVID-19 response

  Global

  OSM communities and humanitarian mapping organizations supported projects involving health facilities, vulnerable communities, supply chains, and local response information during the COVID-19 period.

  Outcome. The work demonstrated the continuing role of open geographic data in public-health and community-response projects.

  Source
• 2014Humanitarian OpenStreetMap Team programs

  Global · Humanitarian and development sectors

  The Humanitarian OpenStreetMap Team organized task-based mapping, training, partnerships, and field activities to apply OSM methods to disaster response, development, and resilience work.

  Outcome. Humanitarian mapping became a structured international activity with dedicated coordination and technology.

  Source
• 2010Haiti earthquake mapping

  Haiti · International humanitarian community

  After the Haiti earthquake, volunteers used satellite imagery and local information to map roads, buildings, settlements, and other features for humanitarian responders. The effort became a landmark example of remote collaborative mapping in a disaster context.

  Outcome. Open geographic information was made available quickly for response organizations, helping establish humanitarian mapping as a major OSM use case.

  Source

• 2020

  Governance and corporate-engagement discussionsStrategy

  Background

  Growth in commercial use led to debate about representation, funding, corporate participation, diversity, and the responsibilities of large organizations using OSM data.

  Action taken

  The OpenStreetMap Foundation and community discussed governance reforms, membership access, board composition, and methods for supporting the wider project.

  Aftermath

  The debates highlighted continuing tension between OSM's volunteer-centered identity and its importance as infrastructure for commercial and institutional users.

  Source

• 2013

  Expansion of the iD browser editorProduct launch

  Background

  The project sought to reduce the technical barrier to contribution and make editing accessible directly through a web browser.

  Action taken

  The iD editor was integrated into the main OpenStreetMap editing experience as a modern browser-based alternative to specialist desktop tools.

  Aftermath

  iD became a major entry point for new mappers while advanced contributors continued to use JOSM and other tools.

  Source

• 2012

  Adoption of the Open Database LicenseStrategy

  Background

  The project needed a database-specific licensing framework that clarified reuse, attribution, and obligations for modified databases more directly than its previous arrangement.

  Action taken

  OpenStreetMap completed its transition to the Open Data Commons Open Database License after a community consultation and contributor-approval process.

  Aftermath

  The ODbL became the principal legal framework for reuse of the OpenStreetMap database and remains central to downstream compliance.

  Source

1. 1OpenStreetMapopenstreetmap.org
2. 2OpenStreetMap Foundation: Aboutwiki.osmfoundation.org
3. 3OpenStreetMap historywiki.openstreetmap.org
4. 4OpenStreetMap Foundation: Licencewiki.osmfoundation.org
5. 5The license change is completeblog.openstreetmap.org
6. 6Humanitarian OpenStreetMap Teamhotosm.org
7. 7OpenStreetMap twentieth anniversaryblog.openstreetmap.org
8. 8First State of the Map conferencestateofthemap.org
9. 9Humanitarian mapping gains global visibilityhotosm.org
10. 10iD becomes a major browser editing toolwiki.openstreetmap.org
11. 11OpenStreetMap Foundation governance debateblog.openstreetmap.org
12. 12Mapping during the COVID-19 responsehotosm.org