The OpenStreetMap Foundation’s Local Chapters and Communities Working Group has formally launched the 31 Day OSM Challenge, an initiative colloquially dubbed “Maptober” that invites digital cartographers and spatial enthusiasts across the globe to contribute daily additions to the world’s most prominent open-source map. Running through the entirety of October, the campaign introduces a structured series of daily themes designed to channel volunteer efforts into refining diverse elements of geographic data, from natural greenery and neighborhood amenities to critical public transit and healthcare infrastructure.
The project draws direct inspiration from the well-established #30DayMapChallenge, a popular social and professional event created for the geospatial community that takes place annually throughout November. While the November initiative traditionally centers on cartographic design, data visualization, and creative spatial representation, Maptober focuses directly on the source data itself. By redirecting the concept toward data collection, validation, and feature enrichment, the OpenStreetMap challenge aims to bolster the underlying database that powers countless open-source navigation engines, humanitarian relief efforts, academic studies, and municipal planning tools.
Under the framework outlined for the month, participants are provided with a distinct mapping prompt for every day of October. The challenge opens on the first day of the month with a focus on forestry and natural vegetation, encouraging contributors to map individual trees, trace wooded patches, or verify existing woodland boundaries. Subsequent daily themes expand into a wide array of urban and rural features, including public benches, pedestrian and vehicular bridges, railway networks, and healthcare facilities such as clinics, pharmacies, and regional hospitals. The comprehensive list of themes has been compiled and published on the official OpenStreetMap Wiki, which serves as a centralized reference point for the global community throughout the event.
To foster a sense of shared participation and track the collective output generated across different regions, contributors are asked to document their work using standardized metadata. When uploading edits to the OpenStreetMap servers, mappers are encouraged to include the hashtags #31DayOSMChallenge and #Maptober within their changeset comments. Mappers are also invited to share snapshots, progress updates, and spatial discoveries on their personal social media channels, helping to amplify the initiative and introduce new participants to collaborative cartography.
Despite the daily structure of the calendar, organizers have emphasized that the challenge is entirely voluntary, informal, and non-competitive. There are no registration requirements, formal leaderboards, or material rewards associated with completing all thirty-one entries. The organizers have made clear that participants face no obligation to submit edits every single day, explicitly welcoming individuals to take part at their own pace, skip prompts that may not align with their local knowledge, or catch up on previous days as their personal schedules allow. The principal reward, as highlighted by the working group, remains the satisfaction of expanding and updating an open, publicly accessible digital commons that serves millions of users worldwide.
Crucially, the guidance issued alongside the event places a strong emphasis on maintaining cartographic integrity and adhering to OpenStreetMap’s established good practices. Organizers have urged contributors to avoid the temptation of mapping solely for the sake of ticking off a checklist or artificially inflating edit counts. In crowdsourced cartography, superficial edits, imprecise tracing from outdated satellite imagery, or inaccurate tagging can degrade data quality and create long-term maintenance burdens for local communities. Participants are therefore encouraged to map accurately, draw on verifiable local knowledge or approved open data sources, and ensure that every addition meaningfully reflects real-world conditions on the ground.
This emphasis on quality aligns with the educational objectives underpinning the challenge. For both seasoned contributors and newer volunteers, the daily prompts offer a deliberate opportunity to broaden individual mapping repertoires. Many active contributors routinely focus on specific categories of infrastructure, such as residential road networks, building footprints, or commercial storefronts. By cycling through varied and sometimes overlooked features—such as seating infrastructure, specialized transport assets, or environmental landmarks—the initiative encourages participants to familiarize themselves with lesser-known tagging schemas, consult community documentation, and master diverse editing environments.
The breadth of themes also provides an avenue for mappers to explore different software tools developed within the broader OpenStreetMap ecosystem. While many casual edits occur through browser-based interfaces such as the default iD editor, more intricate tasks—such as aligning railway tracks, establishing complex multipolygon relations for forested areas, or conducting comprehensive infrastructure reviews—often lead mappers to experiment with advanced desktop software like JOSM. Similarly, mapping local amenities such as benches or neighborhood medical clinics often motivates volunteers to step outdoors and utilize mobile field-mapping applications, bridging the gap between digital data entry and direct ground verification.
The entity coordinating the initiative, the Local Chapters and Communities Working Group, plays a fundamental role within the OpenStreetMap Foundation’s governance structure. Operating primarily through dedicated volunteers, the working group is tasked with supporting grassroots mapping communities, helping national and regional organizations navigate the process of becoming officially recognized local chapters, and facilitating communication among disparate language groups and cultural contexts. By introducing global campaigns like Maptober, the working group seeks to energize local networks, foster cross-border camaraderie, and lower the barriers to entry for individuals who may feel overwhelmed by the sheer scale of the global project.
The initiative comes at a time when the strategic value of open geospatial data continues to grow across both civic and commercial sectors. Founded in 2004 as an alternative to restrictive, proprietary cartographic services, OpenStreetMap has evolved into a foundational layer of global digital infrastructure. Its open licensing enables non-governmental organizations, humanitarian response teams, logistics providers, and independent developers to build navigation tools, conduct spatial analysis, and deploy aid without the recurring licensing costs or geographic restrictions imposed by commercial mapping platforms. Keeping such an expansive database current, however, requires continuous stewardship, particularly in rapidly developing regions and rural communities that commercial mapping corporations frequently overlook.
By establishing a low-pressure, community-oriented framework, Maptober seeks to channel the enthusiasm of the open-source community into sustained, high-quality maintenance of this shared resource. As the challenge progresses throughout the month, the accumulated edits tagged under the campaign will reflect a broad cross-section of the built and natural environment, with trees, transport links, and civic amenities systematically integrated into the map by hundreds of distributed contributors.
Organizers continue to point interested contributors to the dedicated OpenStreetMap Wiki page, where the full calendar of prompts, documentation on tagging conventions, and community discussion links remain publicly available. With the challenge now underway, volunteers around the world are logging into their editors, examining their local surroundings, and adding their contributions to the global map one day at a time.
