Satellite detected water extents between the 13th and the 17th November 2020 in El Salvador

✦ DISCOVERED BY ORIONAIUnited Nations Satellite Centre (UNOSAT)WaterEl Salvador
El Salvador

About this dataset

**UNOSAT code: TC20201118SLV** This map illustrates satellite-detected surface waters (cumulative) in El Salvador as detected by VIIRS-NOAA satellite between 13th & 17th November 2020. Within the analyzed area of about 20,000 km2, a total of about 440 km2 of lands appear to be flooded. Based on HRSL population data and the detected surface waters, about 44,000 people are potentially exposed or living close to flooded areas. The potentially exposed population is mainly located in the departments of Usulutan with ~9,000 people, La Union with ~8,500 people, and Santa Ana with ~7,500 people. This is a preliminary analysis and has not yet been validated in the field. Please send ground feedback to UNITAR-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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