Satellite detected water extents in Maroantsetra District, Analairofo Region, Madagascar as of 9 March 2025

**UNOSAT code: TC20250308MDG, GDACS ID: 1154** This map illustrates the potentially affected cropland in Andapa District, Sava Region, Madagascar, based on RCM-2 satellite images acquired on 9 March 2025. In the analyzed area of approximately 680 km², about 145 km² of cropland is identified, of which about 20 km² appears to be affected by floodwaters. This is a preliminary analysis and has not yet been validated on the ground. Ground feedback is requested and can be sent to the United Nations Satellite Centre (UNOSAT). Important Note: Flood analysis based on radar images may underestimate the presence of standing water in built-up or densely vegetated areas due to the backscattering properties of the radar signal. as of 9 March 2025

This map illustrates satellite-detected flood waters over Maroantsetra area, Analanjirofo region in Madagastcar as observed from the TerraSAR-X radar image acquired on 08 March 2017 compared with to a Radarsat-2 image acquired on 04 May 2014. Several zones seem to be inundated and have experienced an increase of standing waters. These zones are mainly agricultural and/or swamps around the town of Maroantsetra. These waters seem to be the results of the recent heavy rain related also to the cyclone ENAWO-17 which made landfall the 07 March 2017. It is likely that flood waters have been systematically underestimated along highly vegetated areas along main river banks and within built-up urban areas because of the special characteristics of the satellite data used. This is a preliminary analysis and has not yet been validated in the field. Please send ground feedback to UNITAR UNOSAT.

This map illustrates satellite-detected flood waters extent and evolution between 08 and 10 March 2017 over Maroantsetra area, Analanjirofo region in Madagascar as detected by TerraSAR-X radar images acquired on 10 and 08 March 2017. Between 08 and 10 March 2017 and within this map extent, waters receded from about 4,270 ha of lands. Many areas within this zone remain affected and ~6,230 ha of lands were still flooded on the 10 March 2017 whereas ~10,500 ha of lands were flooded the 08 March 2017. It corresponds to about 40% decrease. It is likely that flood waters have been systematically underestimated along highly vegetated areas along main river banks and within built-up urban areas because of the special characteristics of the satellite data used. This is a preliminary analysis and has not yet been validated in the field. Please send ground feedback to UNITAR UNOSAT.

**UNOSAT code: TC20220201MDG** This map illustrates satellite-detected surface waters over Betroka district, Anosy region, Madagascar observed from Sentinel-2 image acquired on 9 February 2022 at 10:00 local time. Within the analyzed cloud free zones of about ~1,000 km2, a total of about 35 km2 of lands appear to be flooded. Based on Worldpop population data and the detected surface waters, about 2,000 people are potentially exposed or living close to flooded areas. This is a preliminary analysis that has not yet been validated in the field. Please send ground feedback to United Nations Satellite Centre (UNOSAT).

**UNOSAT code: TC20220221MDG** This map illustrates satellite-detected surface waters in Vangaindrano district, Atsimo Atsinanana region, Madagascar as observed from a Sentinel-2 image acquired on 1 March 2022 at 10:00 local time. Within the analyzed cloud free zones of about 300km2, a total of about 25 km2 of lands appear to be flooded. Based on Worldpop population data and the detected surface waters, about 5,500 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).

**UNOSAT code: TC20220201MDG** This map illustrates satellite-detected surface waters in Amboasary-Atsimo and Taolagnaro districts, Anosy region, Madagascar as of 8 February 2022 at 05:21 local time. The flood analysis were carried out by using an automated analysis with Artificial Intelligence based methods. Within the analyzed area of about 2,700 km2, about 30 km2 of lands appear to be flooded. Based on Worldpop population data and the detected surface waters, about 3,000 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 UNITAR-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.