Satellite-Detected Flood Extent in Niger's Tillabéri Region, August 2022

377 square kilometers of land were detected as flooded in an analyzed area of approximately 26,000 km² in Tillabéri Region, Niger. The analysis, based on a Sentinel-2 image from 19 August 2022, estimates about 33,500 people potentially exposed to these floodwaters. This is a preliminary UNOSAT analysis not yet validated in the field.

Use Cases

• Estimate population exposure by overlaying detected flood extent with WorldPop population data layers.
• Validate and improve flood detection algorithms using the Sentinel-2 image acquisition from 19 August 2022.
• Analyze the spatial distribution of the 377 km² of flooded land for disaster response planning.
• Use the GEODATABASE or SHP files for geospatial analysis of floodwater boundaries in humanitarian contexts.

Strengths

• Provides a quantified flood extent of 377 km² within a precisely defined 26,000 km² analysis area.
• Includes a derived impact metric estimating 33,500 people potentially exposed to flooding.
• Data originates from the authoritative United Nations Satellite Centre (UNOSAT) for humanitarian mapping.
• Based on a specific Sentinel-2 satellite image acquired on 19 August 2022 at 11:37 local time.

Limitations

• The analysis is explicitly noted as preliminary and has not been validated with ground-truth data.
• Limited to a single point in time (19 August 2022), lacking temporal context or change analysis.
• Spatial scope is restricted to the Tillabéri Region of Niger, limiting broader geographic applicability.

Provenance

Source

United Nations Satellite Centre (UNOSAT)

Collection Method

Satellite image analysis using a Sentinel-2 image.

Time Range

19 August 2022

Freshness

Analysis is from August 2022; the dataset metadata was last updated in March 2026.

Geography

Tillabéri Region, Niger (analysis area ~26,000 km²)