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The Sentinels are a new fleet of European Space Agency (ESA) satellites, developed to deliver a wealth of data and imagery central to Europe’s Copernicus program.
The first in the series, Sentinel-1, includes twin satellites that each carry C-band synthetic aperture radar (SAR), together providing all-weather, day-and-night imagery of Earth’s surface.
Sentinel-1A was launched on 3 April 2014 and Sentinel-1B on 25 April 2016. They orbit 180° apart, together imaging the entire Earth every six days.
The mission benefits numerous services, such as monitoring of Arctic sea-ice extent, routine sea-ice mapping, and surveillance of the marine environment. Applications include oil-spill monitoring and ship detection for maritime security; monitoring land-surface for motion risks; mapping for forest, water, and soil management; and mapping to support humanitarian aid and crisis situations.
Sentinel-1 is the result of close collaboration among ESA, the European Commission, industry, service providers, and data users.
NASA's provision of the complete ESA Sentinel-1 SAR data archive through the ASF DAAC is by agreement between the U.S. State Department and the European Commission (EC). As part of the Earth-observation Copernicus program, the Sentinel mission will provide scientists with accurate, timely, and easily accessible information to help shape the future of our planet.
Content on ASF's Sentinel web pages is adapted from ESA's Sentinel website.