Preliminary Satellite Derived Flood Evolution Assessment, Islamic Republic of Pakistan-22 October 2022

Name: Preliminary Satellite Derived Flood Evolution Assessment, Islamic Republic of Pakistan-22 October 2022
Creator: United Nations Satellite Centre (UNOSAT)
License: http://www.opendefinition.org/licenses/cc-by-sa

✦ DISCOVERED BY ORIONAIUnited Nations Satellite Centre (UNOSAT)EnvironmentPakistan

Pakistan

About this dataset

**UNOSAT code FL20221121PAK** Status: Overall decrease of flood waters observed Further action(s): continue monitoring Summary of findings; Evolution of Cumulative Flood Waters over I.R. of Pakistan (11-17 October 2022 Vs 14-20 November 2022): Between 14 and 20 November 2022 approximately 8 million people remain potentially exposed or living close to flooded areas; Based on satellite observations between 11 and 17 October 2022 and compared with observations between 14 and 20 November 2022 , the overall flood water extent appears to continue to decrease with approximately ~ -9,000 km² in Sindh ,-400 km² in Balochistan, and ~ +500 km² in Punjab.

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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Preliminary Satellite Derived Flood Evolution Assessment, Islamic Republic of Pakistan-11 October 2022

**UNOSAT code FL20220808PAK, GDACS Id: 1101522** Status: Overall decrease of flood waters observed Further action(s): continue monitoring Summary of findings; Evolution of Cumulative Flood Waters over I.R. of Pakistan (26 September-2 October 2022 Vs 03-09 October 2022): Between 03 and 09 October 2022 approximately 13 million people remain potentially exposed or living close to flooded areas; Based on satellite observations between 26 September and 02 October 2022 and compared with observations between 03 and 09 October 2022, the overall flood water extent appears to continue to decrease with approximately 300 km² in Balochistan, ~Punjab 900 km² and ~4,000 km² in Sindh.