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The $1.3 billion mission will help forecasters and first responders stay one step ahead of floods, landslides, and other disasters, scientists said. The satellite, known as NISAR, short for NASA-ISRO Synthetic Aperture Radar,聽will survey the聽same locations twice every 12 days, teasing out changes as small as a fraction of an inch.听Among the satellite鈥檚 most pressing measurements: melting glaciers and polar ice sheets; shifting groundwater supplies; motion and stress of land surfaces prompting landslides and earthquakes; and forest and wetland disruptions boosting carbon dioxide and methane emissions.听The satellite blasted off for its three-year mission from India on Wednesday.