Product ID: 3335 - English
Published: 9 Aug, 2021
GLIDE: FL20210729BGD


Product Links
PDF (12.8MB)     - Static viewing and printing
Shapefile          - Download a Shapefile of data
WebMap          - Dynamic viewing in a browser
Geodatabase   - Download data in the ESRI format
Table                 - Excel

This map illustrates satellite-detected surface waters in Chittagong division, Bangladesh as observed from a Sentinel-1 image acquired on 8 August 2021 at 17:55 local time. Within the analyzed area of about 18,700 km2 and, about 873 km2 of lands appear to be flooded. The water extent appears to have increased of about 21 km2 since 30 July 2021. 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 Cox's Bazar with ~393,240 people, Chittagong with ~358,320 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.
Satellite Data: Sentinel-1
Imagery Dates (1): 27 July 2021 at 11:56 UTC
Imagery Dates (1): 29 July 2021 at 23:48 UTC
Imagery Dates (2): 8 August 2021 at 11:55 UTC
Resolution: 10 m
Copyright: Contains modified Copernicus Sentinel Data [2021]
Source: ESA
Administrative boundaries: Bangladesh Bureau of Statistics (BBS)
Population data: WorldPop [2020]
Reference Water: JRC
Populated place: OpenStreetMap
Road data: OpenStreetMap
Waterways: OpenStreetMap
Background: ESRI World Imagery