This image from the Sentinel-3 satellite shows the Nile River and its delta, as well as the surrounding desert areas of northeast Africa and parts of the Middle East.
The Nile River is an enormous north-flowing river in northeastern Africa. It is generally regarded as the longest river in the world, however other conflicting sources cite a 2007 study that gave the title to the Amazon River in South America.
Very distinct is Egypt, a country connecting northeast Africa with the Middle East, home to millennia-old monuments still sitting along the lush Nile valley.
In the center of the image, capital city Cairo with the Nile River snaking northwards is clearly visible, along with the Red Sea just further east. Also evident are the islands of Cyprus further north in the Mediterranean Sea and parts of Crete on the very left.
One of the suite of sophisticated instruments that will measure Earth’s oceans, land, ice and atmosphere, Sentinel-3’s Sea and Land Surface Temperature Radiometer (SLSTR) measures the energy radiating from Earth’s surface in nine spectral bands, including visible and infrared.
The instrument improves on the capabilities of the Advanced Along-Track Scanning Radiometer carried by the Envisat satellite of 2002–12, including a wider swath of 1400 km, new channels and a partly higher spatial resolution.
Combining radiometer and color data helps us to understand the state of vegetation better.