Pakistan has endured heavy monsoon rains since late June 2025. The comparison above shows a false-color corrected reflectance image (Bands M11-I2-I1) of flooding in Pakistan on September 11, 2025, on the left "A" side; on the right "B" side is the Flood 3-day window composite. These images are from the Visible Infrared Imaging Radiometer Suite (VIIRS) aboard joint NASA/NOAA NOAA-20 and NOAA-21 platforms.
Swipe the bar back and forth to see how the dark blue floodwaters in the left image coincide with the red flood pixels shown on the right side. The Flood 3-day window composite is created following three key steps: 1) water detection algorithm applied to each VIIRS observation; 2) compositing of these water detections over time to reduce errors and more rigorously identify water; and 3) differentiating flood from expected surface water. Click on the image to open the full version of Worldview in a new browser tab.
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