Satellite detected water extents between 26 and 30 July 2023 over Pakistan

Name: Satellite detected water extents between 26 and 30 July 2023 over Pakistan
Creator: United Nations Satellite Centre (UNOSAT)
License: http://www.opendefinition.org/licenses/cc-by-sa

✦ DISCOVERED BY ORIONAIUnited Nations Satellite Centre (UNOSAT)WaterPakistan

Pakistan

About this dataset

**UNOSAT code FL20230729PAK** This map illustrates cumulative satellite-detected water using VIIRS in Pakistan between 26 to 30 July 2023. Within the analyzed area in a cloud-free zone of about 723,000 km², a total of about 27,000 km² of land appear to be affected by flood waters. Based on Worldpop population data and the maximum flood water coverage, at least 10 million people were 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 the 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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Satellite detected water extents from 21 July 2024 to 03 August 2024 over Pakistan

**UNOSAT code: FL20240804PAK** This map illustrates cumulative satellite-detected water using VIIRS in Pakistan from 21 July 2024 to 03 August 2024. Within the analysed area of about 800,000 km², a total of about 18,000 km² of lands appear to be affected with flood waters. Based on Worldpop population data and the maximum flood water coverage, about 7.7 million people were 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 the United Nations Satellite Centre (UNOSAT).