Thailand flood history map
Search an address, soi, or condo project to see whether it falls inside a historical satellite-observed flood extent. Free to use and embed — data and methodology below.
Flood events covered
| Event | Observed window | Source | Licence | Download GeoJSON |
|---|---|---|---|---|
| Satellite detected water extents in Doi Tao District, Chiang Mai Province as of 6 October 2024 | October 6, 2024 – October 6, 2024 | UNOSAT (United Nations Satellite Centre) doitao | CC BY-SA 4.0 | Download GeoJSON |
| Satellite detected water extents from 5 to 10 October 2024 over Chiang Mai and Lamphun Provinces | October 5, 2024 – October 10, 2024 | UNOSAT (United Nations Satellite Centre) chiangmai-lamphun | CC BY-SA 4.0 | Download GeoJSON |
| Satellite detected water extents from 1 Aug. 2024 to 22 October 2024 over Chiang Rai Province | August 1, 2024 – October 22, 2024 | UNOSAT (United Nations Satellite Centre) chiangrai | CC BY-SA 4.0 | Download GeoJSON |
| Satellite detected water extents from 1 August 2024 to 12 October 2024 over Phayao Province | August 1, 2024 – October 12, 2024 | UNOSAT (United Nations Satellite Centre) phayao | CC BY-SA 4.0 | Download GeoJSON |
| Northeastern Thailand floods -- Sentinel-1, 2021-11-08 to 2021-11-11 (UNOSAT) | November 8, 2021 – November 11, 2021 | UNOSAT (United Nations Satellite Centre) unosat-fl20210928tha-s1-20211108-20211111-northeastern | CC BY-SA 4.0 | Download GeoJSON |
| Central & Western Thailand floods -- Sentinel-1, 2021-11-01 (UNOSAT) | November 1, 2021 – November 1, 2021 | UNOSAT (United Nations Satellite Centre) unosat-fl20210928tha-s1-20211101-central-western-regions | CC BY-SA 4.0 | Download GeoJSON |
| Central & Western Thailand floods -- Sentinel-1, 2021-10-20 (UNOSAT) | October 20, 2021 – October 20, 2021 | UNOSAT (United Nations Satellite Centre) unosat-fl20210928tha-s1-20211020-central-western-regions | CC BY-SA 4.0 | Download GeoJSON |
| Northeastern Thailand floods -- Sentinel-1, 2021-10-17 to 2021-10-18 (UNOSAT) | October 17, 2021 – October 18, 2021 | UNOSAT (United Nations Satellite Centre) unosat-fl20210928tha-s1-20211017-20211018-northeastern | CC BY-SA 4.0 | Download GeoJSON |
| Northeastern Thailand floods -- Sentinel-1, 2021-10-17 (UNOSAT) | October 17, 2021 – October 17, 2021 | UNOSAT (United Nations Satellite Centre) unosat-fl20210928tha-s1-20211017-northeastern | CC BY-SA 4.0 | Download GeoJSON |
| Northeastern Thailand floods -- Sentinel-1, 2021-10-15 (UNOSAT) | October 15, 2021 – October 15, 2021 | UNOSAT (United Nations Satellite Centre) unosat-fl20210928tha-s1-20211015-northeastern | CC BY-SA 4.0 | Download GeoJSON |
| Central & Western Thailand floods -- Sentinel-1, 2021-10-10 (UNOSAT) | October 10, 2021 – October 10, 2021 | UNOSAT (United Nations Satellite Centre) unosat-fl20210928tha-s1-20211010-central-western-regions | CC BY-SA 4.0 | Download GeoJSON |
| Northeastern Thailand floods -- Sentinel-1, 2021-10-09 (UNOSAT) | October 9, 2021 – October 9, 2021 | UNOSAT (United Nations Satellite Centre) unosat-fl20210928tha-s1-20211009-northeastern | CC BY-SA 4.0 | Download GeoJSON |
| Nakhon Ratchasima floods -- KOMPSAT-5, 2021-10-06 (UNOSAT) | October 6, 2021 – October 6, 2021 | UNOSAT (United Nations Satellite Centre) unosat-fl20210928tha-kompsat5-20211006-nakhon-ratchasima | CC BY-SA 4.0 | Download GeoJSON |
| Chaiyaphum, Khon Kaen & Nakhon Ratchasima floods -- Sentinel-1, 2021-10-05 (UNOSAT) | October 5, 2021 – October 5, 2021 | UNOSAT (United Nations Satellite Centre) unosat-fl20210928tha-s1-20211005-chaiyaphum-khon-kaen-nakhonratchasima | CC BY-SA 4.0 | Download GeoJSON |
| Central Thailand floods -- Sentinel-1, 2021-10-02 (UNOSAT) | October 2, 2021 – October 2, 2021 | UNOSAT (United Nations Satellite Centre) unosat-fl20210928tha-s1-20211002-central-region | CC BY-SA 4.0 | Download GeoJSON |
| Upper Central Thailand floods -- Sentinel-1, 2021-10-01 (UNOSAT) | October 1, 2021 – October 1, 2021 | UNOSAT (United Nations Satellite Centre) unosat-fl20210928tha-s1-20211001-upper-central-region | CC BY-SA 4.0 | Download GeoJSON |
| Chaiyaphum, Khon Kaen & Nakhon Ratchasima floods -- Sentinel-1, 2021-09-29 (UNOSAT) | September 29, 2021 – September 29, 2021 | UNOSAT (United Nations Satellite Centre) unosat-fl20210928tha-s1-20210929-chaiyaphum-khon-kaen-nakhonratchasima | CC BY-SA 4.0 | Download GeoJSON |
Methodology
Flood extents are derived from satellite radar (SAR) imagery captured during specific flood events, analysed by the source organisations listed below. A location is marked "flooded" when it falls inside a mapped flood polygon for at least one event, "not flooded" when it falls inside an event's analysed area but outside any flood polygon, and "no data" when no covered event's analysed area reaches it at all.
What this tool does not tell you
This map shows historical satellite (SAR radar) observations of specific past flood events — it is not a flood forecast, a flood-risk score, or a guarantee that a location will or won't flood in the future.
Radar can under-detect standing water in dense urban areas (tall buildings, narrow sois) and under tree canopy, so a real flood can be missed by the source imagery.
A "not flooded" result only means no flooding was observed within the area a satellite pass actually analysed for that event — it is not confirmation the location stayed dry, and it says nothing about events not listed here.
Coverage is limited to the events listed above — specific provinces and date ranges, not an ongoing, nationwide flood monitor.
See the attribution page