Organised Editing/Activities/Thailand Floods 2025
| General Information | ||||||||||||||
Context of the Activation Parts of Thailand has been devastated by a "once in 300 year" storm (CNN). As of 27 November 2025, IFRC, DG ECHO, and TMD reported severe floods affecting Northern, Central, and Penisular (Southern) Thailand; with 46 fatalities, 3.22 million affected people, and nearly 740,500 affected houses across the country. In response to this tragedy, ThaiOSM - Thailand's OpenStreetMap Community, with support from Humanitarian OpenStreetMap Team (HOT), is leading a mapping initiative to support disaster response and recovery efforts. The goal is to provide essential mapping data to local humanitarian actors, helping them plan and coordinate both immediate emergency relief and long-term reconstruction efforts. | ||||||||||||||
Contacts
- Coordination: Bernard Heng [email protected]
- Support: Dinar Adiatma ([email protected])
If you are part of an organization or community involved in the response and have OSM data needs, please reach out to Bernard Heng [email protected] to share your priority locations and/or features for mapping.
Hashtag
All contributions through HOT's Tasking Manager are tracked with a unique change set comment tag: #thaifloods2025
ohsomeNow Stats page for tracking overall contributions
Timeline
- Start: 27 November 2025
- End: TBC
Map and Data Services
Accessing OpenStreetMap data
For wide area downloads use the Humanitarian Data Exchange (HDX), see the HDX Thailand OSM datasets (updated on a monthly basis, with last update on 3 November 2025).
For more targeted downloads: from a Tasking Manager project page, scroll down to the 'Download OSM Data' section once the project is 100% complete.
Prioritisation
According to IFRC, DG ECHO, and TMD, affected provinces in the central and north are Phitsanulok, Nakhon Sawan, Uthai Thani, Sing Buri, Chainat, Ang Thong, Suphan Buri, Phra Nakhon Si Ayutthaya, Pathum Thani, Nonthaburi and Nakhon Pathom. The affected ones across Peninsular (Southern) Thailand are Surat Thani, Nakhon Si Thammarat, Trang, Phatthalung, Satun, Songkhla, Pattani, Yala, and Narathiwat.
HOT is currently coordinating between multiple parties and organisations to identify a priority list of areas to support mapping. As of 27 November 2025, preliminarily the prioritised provinces are:
- Songkhla (most severely affected - all 16 districts)
- Pattani
- Yala
- Narathiwat
- Nakhon Si Thammarat
- Phatthalung
- Satun
Other relevant resources
General
- Google Flood Hub on Thailand Floods
- To be added along the activation.
Remote sensing / imagery
- To be added along the activation.
About This Disaster Activation
About HOT
To learn more about the Humanitarian OpenStreetMap Team (HOT), explore more of our wiki-pages (root: HOT) or our website hotosm.org. HOT is a global community, mostly of volunteers, and it is a US registered nonprofit able to contract with organizations (email info at hotosm.org to contact our staff), we are also a 501(c)(3) charitable organization.
History of this Activation
- 24 November 2025: Record torrential rain over Thailand, leading to severe floods across the country.
- 27 November 2025: HOT received multiple requests to support mapping efforts in Thailand. HOT began coordination with ThaiOSM, with the local OSM community taking lead.
- 27 November 2025: Size-up completed by Bernard Heng
Data Quality
Validation
Validation permissions for Tasking Manager projects are restricted to users with intermediate+ status (more than 250 changesets) that are part of certain validation teams. Teams are groups of OSM users that have been granted permission to join a team based on their experience.
For Mappers
How You Can Contribute
Learn to Map
- Most of our volunteer needs are for remote OSM contributors, visit LearnOSM.org to get started.
Mapping Priority
- Please choose from highest priority first.
- We call for local mappers to prioritize local knowledge on the area.
Tasking Manager
HOT Tasking Manager projects and their progress can be seen here. For any projects that are marked 'Published', select the link in the Project ID column and it will launch the project and you will be able to contribute.
Mapping Instructions
- For remote mapping of buildings and roads via HOT's Tasking Manager: See this project's instructions