The European Space Agency (ESA) is Europe’s gateway to space. Its mission is to shape the development of Europe’s space capability and ensure that investment in space continues to deliver benefits to the citizens of Europe and the world.
Find out more about space activities in our 23 Member States, and understand how ESA works together with their national agencies, institutions and organisations.
Exploring our Solar System and unlocking the secrets of the Universe
Go to topicProtecting life and infrastructure on Earth and in orbit
Go to topicUsing space to benefit citizens and meet future challenges on Earth
Go to topicMaking space accessible and developing the technologies for the future
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The so-called 'Permanent Scatterer' method of Synthetic Aperture Radar Interferometry (InSAR) involves combining multiple radar images of the same location, using 'stable scatterers' such as rock outcrops or buildings to avoid signal decoherence and make measurements of millimetre-scale ground shifts occurring between acquisitions. Permanent-Scatterer InSAR is at the basis of the SLAM project in Italy, aimed at better quantifying landslide hazard and employing a decade's worth of archived satellite data. Here permanent scatterer measurements are overlaid on a Spot 5 image and wrapped on a digital elevation model.