Sentinel-1A transmits data to Earth when passing over ground stations in Norway, Italy and Spain. For continual data delivery, the satellite is also equipped with a laser terminal to transmit data to satellites in geostationary orbit carrying the European Data Relay System (EDRS). These satellites then transmit the Sentinel-1 data to the ground. Complementing the Sentinel ground-station network, EDRS ensures the timely availability of large volumes of data. Sentinel-1A is the first in the family of satellites for Europe's Copernicus programme, the largest environmental monitoring programme in the world. This new satellite carries an advanced radar instrument to image Earth’s surface through cloud and rain, regardless of whether it is day or night. Among its many applications Sentinel-1 routinely
monitors shipping zones, maps sea ice and provides information on winds and waves for marine traffic, tracks changes in the way land is being used, provides imagery for rapid response to disasters such as floods, and monitors uplift and subsidence.
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