Maps: Satellite data reveals extent of Assam floods
The flood situation in Assam's Brahmaputra valley remained severe on Monday, with water levels continuing to rise across several regions, according to officials. Satellite imagery and flood-mapping data analysed by India Today's OSINT team using Sentinel-1 SAR (Synthetic Aperture Radar) data revealed that large areas of land were submerged under floodwaters.Using the same methodology, the composite overview imagery showed extensive inundation across key districts in Assam, including Nalbari, Guwahati, Nagaon, Silchar, Golaghat and Kamrup. Isolated flood signatures were also detected across nearly 19-20 districts, including Dhemaji, Dibrugarh, Darrang, Biswanath, Tinsukia, Karbi Anglong, Karbi Anglong West, Kamrup, Hojai, Sonitpur, Charaideo, Sivasagar, Majuli and Jorhat.advertisement
In Assam's Kamrup Metropolitan district, flooding was primarily observed along the floodplains of the Digaru river. Satellite imagery indicated severe inundation in key urban zones, particularly in the Garchuk and Boragaon localities of Guwahati.
Blue shades represent flooding in Kamrup.
A similar pattern emerged in the satellite imagery of Nagaon district, where floodwaters were concentrated along the floodplains of the Kapili river. Significant inundation was detected near Kaziranga National Park, as well as in the areas of Barhampur, Barafuti and Kampur town.Using Google Earth Engine (GEE), we processed Sentinel-1 SAR datasets to perform time-series analysis of flood dynamics. By comparing radar data from the pre-monsoon and monsoon periods, we identified changes in surface water coverage that allowed us to detect newly-flooded zones. The use of SAR data, which can penetrate cloud cover and heavy rain, allowed consistent monitoring even during peak weather conditions. This approach enabled clear visualization of flood extent across Assam's impacted districts.advertisementFor this analysis, we utilised pre-flooding (April 16 to May 7) and intra-flooding (May 31 to June 1) remote sensing datasets to conduct a differential assessment of surface water extent. By analysing temporal variations in satellite imagery, we were able to highlight flood-affected zones with enhanced spatial accuracy.The India Meteorological Department (IMD) has issued a red alert for Assam and Meghalaya, warning the states of heavy to very heavy rainfall in the coming week. Similar alerts have been issued for Nagaland, Mizoram, Manipur and Tripura, which are also expected to receive intense rainfall.Must Watch
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