Floodwater Depth in Saint-Louis and Matam Regions, Senegal as of 23 October 2024

✦ DISCOVERED BY ORIONAIUnited Nations Satellite Centre (UNOSAT)EnvironmentSenegal
Senegal

About this dataset

**UNOSAT code: FL20241022SEN** This map illustrates floodwater depth in in Saint-Louis and Matam Regions, Senegal observed from VIIRS flood depth data as of 23 October 2024. Important note: This map is prepared with a 30-m VIIRS satellite-derived Floodwater Depth product. It has been downscaled with software that uses VIIRS daily composite flood products at 375-m resolution as a basis. Products are under development and processed in near real-time at the Cooperative Institute for Meteorological Satellite Studies (CIMSS). This is a preliminary analysis intended to be used for guidance purposes and has yet to be validated with ground truth data. Please send field observations to United Nations Satellite Centre (UNOSAT).

Documentation

UNOSAT datasets and maps are produced using a variety of methods. In general, analysts closely review satellite imagery, often comparing two or more images together, and determine notable changes between the images. For damage assessments, refugee or IDP assessments, and similar analyses, these changes are then manually documented in the vector data by the analyst. For flood extractions, landcover mapping and similar analyses, a variety of automated remote sensing techniques are used to extract the relevant information which is then reviewed and revised as necessary by the analyst. In all cases, resulting data is then loaded into a standardized UNOSAT geodatabase and exported asshapefiles for dissemination. This is a preliminary assessment and has not yet been validated in the field. It is important to consider the characteristics of the source imagery used in the analyses when interpreting results. For damage assessments it should be noted that only significant damage to the structural integrity of the buildings analyzed can be seen in imagery, while minor damage such as cracks or holes may not be visible at all. For flood extractions using radar data it is important to note that urban areas and highly vegetated areas may mask the flood signature and result in underestimation of flood waters. Users with specific questions or concerns should contact unosat@unitar.org to seek clarification.

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