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Satellite detected water extent over Province 1, Nepal as of 4 July 2021

The Centre for Humanitarian Data · 2021 Full Details

Full Details

Title
Satellite detected water extent over Province 1, Nepal as of 4 July 2021
Description
**UNOSAT code: FL20210630NPL** This map illustrates satellite-detected surface waters in Province 1, Nepal as observed from a Sentinel-1 image acquired on 4 July 2021 at 05:48 local time and using an automated analysis with Machine learning method. Within the analyzed area of 4,060 km2, about 240 km2 of lands appear to be flooded. The water extent appears to have decreased of about 200 km2 since 1 July 2021 and moved toward India. Based on Worldpop population data and the detected surface waters in the analyzed area, the potentially exposed population is mainly located in the district of Sunsari with ~186,000 people, Morang with ~83,600 people, and Jhapa with ~21,700 people. This is a preliminary analysis and has not yet been validated in the field. Please send ground feedback to United Nations Satellite Centre (UNOSAT). Important note: Flood analysis from radar images may underestimate the presence of standing waters in built-up areas and densely vegetated areas due to backscattering properties of the radar signal.
Creator
UN Operational Satellite Applications Programme (UNOSAT)
Publisher
The Centre for Humanitarian Data
Temporal Coverage
2021-07-06
Date Issued
2022-02-18
License
http://www.opendefinition.org/licenses/cc-by-sa
Access Rights
Public
Date Added
August 23, 2025

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Cite and Reference

  • Citation
    UN Operational Satellite Applications Programme (UNOSAT) (2022). Satellite detected water extent over Province 1, Nepal as of 4 July 2021. The Centre for Humanitarian Data. https://data.humdata.org/dataset/af971911-8f38-4e6c-b8fe-214be84a6810 (dataset)
  • BTAA Geoportal Link

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