Preliminary Satellite Derived Flood Evolution Assessment, Islamic Republic of Pakistan - 20 January 2023

Name: Preliminary Satellite Derived Flood Evolution Assessment, Islamic Republic of Pakistan - 20 January 2023
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 Evolution of Cumulative Flood Waters over I.R. of Pakistan (01-07 January 2023 Vs 09-15 January 2023): Between 09 and 15 January 2023 approximately 4.5 million people remain potentially exposed or living close to maximum floodwaters areas(*); Approximately 1.3 million people are potentially exposed or living close to minimum floodwaters areas(**) between 09 and 15 January 2023; Based on satellite observations between 01 and 07 January 2023 and compared with observations between 09 and 15 January 2023 , the maximum flood water extent appears to continue to retract with approximately ~ -1,800 km² in Sindh , ~ - 250 km² in Balochistan, ~ -200 km² in Khyber Pakhtunkhwa and ~ -200 km² in Gilgit Baltistan.

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 - 07 March 2023

**UNOSAT code FL20221121PAK** Status: Overall decrease of flood waters observed Further action(s): continue monitoring Evolution of Cumulative Flood Waters over I.R. of Pakistan (11-15 February 2023 Vs 24-28 February 2023): Between 24 and 28 February 2023 approximately 1.8 million people are potentially exposed or living close to maximum floodwaters areas(*); Approximately 420,000 people are potentially exposed or living close to minimum floodwaters areas(**) between 24 and 28 February 2023; Based on satellite observations between 11 and 15 February 2023 and compared with observations between 24 and 28 February 2023 , the maximum flood water extent appears to continue to retract with approximately ~ -850 km² in Sindh , ~ - 150 km² in Punjab, ~ -140 km² in Balochistan and ~ - 60 km² in Khyber Pakhtunkhwa.