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Remote sensing has become an indispensable tool for understanding both physical processes and human activities on the Earth’s surface. In the context of floods, it helps in observing, analyzing, and managing the physical characteristics of flood events, while in the context of settlements, it provides valuable insights into patterns of human habitation, growth, and vulnerability. The ability of remote sensing to acquire repetitive, synoptic, and multi-spectral data over large areas makes it particularly suitable for studying floods and settlements, which are dynamic in nature and often spread over extensive regions. In flood studies, remote sensing is primarily applied to analyze physical aspects such as rainfall distribution, river behavior, inundation extent, flood dynamics, and post-flood impacts. Satellite-based sensors operating in optical, thermal, and microwave regions of the electromagnetic spectrum play a crucial role in flood monitoring. One of the most important applications is flood mapping. During flood events, satellites like Landsat, Sentinel-2, and MODIS provide images that help identify inundated areas by distinguishing water from land based on spectral reflectance. Water bodies absorb most of the near-infrared radiation and appear dark, allowing accurate delineation of flooded zones. Such flood extent maps are essential for emergency response, relief planning, and damage assessment. Microwave remote sensing, especially Synthetic Aperture Radar (SAR), has ___ ____ ________ ________ _____ ________.
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