Satellite detected water extents in Doi Tao District, Chiang Mai Province as of 6 October 2024

**UNOSAT code: FL20240912THA** This map illustrates cumulative satellite-detected water extent from multiple satellites in Chiang Mai and Lamphun Provinces, Thailand, from 5 to 10 October 2024. Within the cloud-free analysed areas of about 4,000 km², about 245 km² of land appears to have been affected by flood waters, with around 70 km² of cropland inundated. Based on Worldpop spatial demographic data, about 228,000 people are exposed or living close to flooded areas. This is a preliminary analysis and has not yet been validated in the field. Please send ground feedback to the United Nations Satellite Centre (UNOSAT).

**UNOSAT code: FL20240912THA** This map illustrates cumulative detected water using multiple satellites in Chiang Rai Province, Thailand from 1 August to 22 October 2024. Within the boundary of Chiang Rai Province of about 11,600 km², a total of about 875 km² of land appears to be affected by flood waters, with around 700 km² of cropland inundated. Based on Worldpop spatial demographic data, about 94,100 people are exposed or living close to flooded areas. This is a preliminary analysis and has not yet been validated in the field. Please send ground feedback to the United Nations Satellite Centre (UNOSAT). This work is the result of collaboration between UNOSAT and GISTDA operating under the agreement of the UNOSAT Rapid Mapping Partners Initiative Programme

**UNOSAT code: FL20240912THA** This map illustrates cumulative detected water using multiple satellites and drone in Phayao Province, Thailand from 1 August to 12 October 2024. Within the analysed area of about 6,200 km², a total of about 360 km² of land appears to be affected by flood waters, with around 330 km² of cropland inundated. Based on Worldpop spatial demographic data, about 13,500 people are exposed or living close to flooded areas from 1 August to 12 October 2024. This is a preliminary analysis and has not yet been validated in the field. Please send ground feedback to the United Nations Satellite Centre (UNOSAT).

**UNOSAT code: FL20210928THA** This map illustrates satellite-detected surface waters in Northeastern part of Thailand as observed from a Sentinel-1 image acquired on 10 Oct 2021 at 06:00 local time and using an automated analysis with Machine learning method. Within the analyzed area of about 60,000 km2 , about 660 km2 of lands appear to be flooded. The water extent appears to have decreased of about 100 km2 since 5 October 2021 and moved toward east part. Based on Worldpop population data and the detected surface waters in the analyzed area, the potentially exposed population is mainly located in the district of Mueang Khon Kaen with ~ 6,300, Kosum Phisai with ~ 6,000 people, and Phimai with ~ 5,300 people. This is a preliminary analysis and has not yet been validated in the field. Please send ground feedback to United Nations Satellite Centre (UNOSAT). Important note: Flood analysis from radar images may underestimate the presence of standing waters in built-up areas and densely vegetated areas due to backscattering properties of the radar signal.

**UNOSAT code TC20220928THA, GDACS Id: 1000922** This map illustrates satellite-detected surface waters in Chaiyaphum and Nakhon Ratchasima Provinces, Thailand as observed from a RCM-2 image acquired on 4 October 2022 at 06:08 local time. Within the extent of this map of 1,100 km², about 240 km² of lands appear to be flooded. Based on Worldpop population data and the detected surface waters in the map extent, about 24,000 people are potentially exposed or living close to flooded areas. This is a preliminary analysis and has not yet been validated in the field. Please send ground feedback to United Nations Satellite Centre (UNOSAT). Important note: Flood analysis from radar images may underestimate the presence of standing waters in built-up areas and densely vegetated areas due to backscattering properties of the radar signal.

**UNOSAT code: FL20240913LAO** This map illustrates the floods detected using Sentinel-1 images acquired on 11 September 2024 at 06:07 local time. Within the analysed area of approximately 60 km², about 7 km² of land appears to be affected by floodwaters, including 6 km² of croplands. According to WorldPop spatial demographic data, an estimated 2,500 people are exposed to or living near the flooded areas. Please note that this is a preliminary analysis and has not been validated in the field. We welcome any ground feedback that can be provided to the United Nations Satellite Centre (UNOSAT). Important: Flood analysis based on radar images may underestimate the extent of standing water in built-up or densely vegetated areas due to the radar signal's backscattering properties.