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From Mappers to Movement Builders: Strengthening Local Leadership through Open Mapping Gurus (sotm2025)
The Open Mapping Gurus are more than skilled mappers—they are changemakers rooted in their local contexts, driven by purpose, and committed to building resilient communities through open data. As mapping needs shift from short-term project engagement to long-term sustainability and impact, we need to equip these local champions not just with tools—but with vision, leadership, and strategy. This workshop explores how Open Mapping Gurus can play a central role in implementing and co-owning regional and national community-building strategies. Drawing from the Asia-Pacific Open Mapping Hub’s 2025–2030 Community Building Strategy, this session will present pathways for...
The Role of Crowdsourced Damage Assessment in Disaster Response and Recovery (sotm2025)
During disasters, there is a need for accurate, rapid, and reliable mapping, validation, and damage assessment to inform humanitarian response and recovery efforts. However, as disasters are often extensive in scale, it is important that these methodologies are scalable and can be employed for multiple affected areas at any point in time. Crowdsourced mapping, validation, and damage assessment, when combined with multiple layers of validation with local knowledge, enables humanitarian actors to quickly reach multiple affected areas at once - ensuring that no one is left behind. Humanitarian OpenStreetMap Team (HOT) will cover the crowdsourced...
Why and how to visualize OSM data using pmtiles (sotm2025)
In this talk I will describe the pros and cons of using the pmtiles vector tile format in comparison with other tile formats. I will then talk about some of the tools available to generate pmtiles tiles based on OSM data and other GIS formats, inspect these tiles and visualize them on a website. Finally, I will demonstrate how I built in the real world a data pipeline to filter and transform OSM data, combine it with other data from external sources, generate pmtiles using the tools previously described and implement a website to...
Lightning Talks V (sotm2025)
## Building Resilience Spales through Open Mapping
_by Jannie Fleur V. Oraño_
## Mapping pet-friendly spaces in OSM
_by Leigh Lunas_
## Geo Drawing
_by Moe Anjo, Mia Kozaki, Rensei Inoue, Yudai Kato_
## OSM vs. Field Practical Training
_by Erick Tamba Mnyali_
## World's best addressing system
_Dan Jacobson_
## Invitation to FOSS4G 2026 in Hiroshima
_by Satoshi Tanaka_
Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/
about this event: https://2025.stateofthemap.org/sessions/N79KTE/
Video:sotm2025-74411-eng-Lightning_Talks_V_hd.mp4
It’s complicated (sotm2025)
Unlike most world maps, OpenStreetMap is built by a global community with a keen focus on local knowledge. For many local communities, proper representation of the native language is just as important as getting the locations right. OpenHistoricalMap extends this approach back in time, incidentally tracking the evolution of written language through toponyms. Increasingly, users experience both projects through vector maps, which cannot necessarily benefit from the techniques that enable broad language support in raster maps. In particular, many Asian writing systems present unique implementation challenges for both cartographers and renderer developers. This talk traces...
OSMF Board AMA (sotm2025)
During the OpenStreetMap Foundation Board Ask Us Anything (i.e. AMA) session, we will take questions from the audience oand/or more questions that the larger community can submit before the event. We can discuss the board's past actions and our future plans. Let’s have a conversation about the Foundation and the Board and how all the parts work together. If you know nothing about what the board is doing, this is a chance to find out. Find out what the Foundation does and doesn’t do, what it can and can’t do. Find out how you can...
Community Participatory Mapping of Water Sanitation and Hygiene Access for Sustainable Urban Planning. (sotm2025)
Access to safe water and sanitation is critical for public health and sustainable urban development, yet significant disparities persist in informal settlements across low- and middle-income countries. This study explores inequalities in WASH access within Korogocho and Viwandani which are two densely populated informal settlements in Nairobi, using a participatory geospatial approach. Community members collaborated in mapping key WASH-related assets, including water points, sanitation facilities, and waste collection sites, enabling a detailed spatial understanding often absent in official datasets. A three-stage methodology was applied: participatory asset mapping, field validation using SurveyCTO , and data digitization...
What Could You Do with 100 Days of Mapping? (sotm2025)
What could you really accomplish with 100 days of consistent mapping? Add 1000 buildings, delete 100 nodes, or achieve completeness for an entire neighbourhood? Within the OpenStreetMap community, mappers contribute at different levels and frequencies using several tools and editors to enhance the map. In this presentation, we will share our experiences mapping every single day - the lessons learnt, the shortcuts we somehow didn't know, and key insights on maintaining data quality while sustaining a daily mapping practice over an extended period. We'll explore frameworks that could be considered for similar mapping challenges,...
UN Mappers: Building a Community of Mappers to Support Peace with OpenStreetMap (sotm2025)
The UN Maps Programme, an initiative from the Department of Operational Support at the United Nations, provides topographic maps, operational geo-information, search and navigation tools, and imagery and street-level base maps to peacekeeping and humanitarian actors in UN mission areas. UN Maps has established a community of OpenStreetMap (OSM) data contributors called UN Mappers. The UN Mappers community is a collective of open mapping enthusiasts dedicated to building accurate and crowd-worked geospatial data to support peacekeeping and humanitarian missions on the ground. The session aims to provide updates about the UN Maps programme and the...
OSM mapping of building damage - review and prospects after Chido in Mayotte (sotm2025)
On December 14, 2024, the territory of Mayotte, a French department of more than 300,000 inhabitants made up of several islands between Africa and Madagascar, was hit by the passage of Chido, the most violent cyclone it had seen in more than fifty years. Pleiades imagery taken in the following days, between December 17 and 24, were posted online and released for the OSM contribution. These images provided an opportunity to compare the situation before and after the disaster and to assess the damage to thousands of buildings. The presentation will explain the chosen methodology,...