Preliminary satellite-derived flood evolution assessment - 16 September 2022

Name: Preliminary satellite-derived flood evolution assessment - 16 September 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 FL20220808PAK, GDACS Id: 1101522** Status: Overall decreasing flood waters observed Further action(s): continue monitoring Evolution of Cumulative Flood Impact Assessment (01 - 07 September Vs 08-14 September 2022): From 08 to 14 September 2022 approximately 19 million people remain potentially exposed or living close to flooded areas; Based on satellite observations from 01-07 September 2022 and 08-14 September 2022, the overall flood situation appears to be decreasing with approximately 1,700 km² in Balochistan, ~Punjab 3,900 km² and ~850 km² in Sindh. The dotted line represents approximately the Line of Control in Jammu and Kashmir agreed upon by India and Pakistan. The final status of Jammu and Kashmir has not been agreed upon by the parties. The boundary and names shown on this map do not imply official endorsement or acceptance by the United Nations.

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 - 23 September 2022

**UNOSAT code FL20220808PAK, GDACS Id: 1101522** Status: Overall decreasing flood waters observed Further action(s): continue monitoring Evolution of Cumulative Flood Impact Assessment (08 - 14 September Vs 15-21 September 2022): From 15 to 21 September 2022 approximately 17 million people remain potentially exposed or living close to flooded areas; Based on satellite observations between 08 to 14 September 2022 and compared with observations between 15 and 21 September 2022, the overall flood waters extents appears to continue to decrease with approximately 600 km² in Balochistan, ~Punjab 1,100 km² and ~5,000 km² in Sindh.