The Sentinel-3A satellite has made the buzz despite itself in the blogosphere.
Iit was placed in orbit with the mission of collecting data relating to changes in the Earth's climate, the level of the oceans, the state of the vegetation, etc. Capable of scanning the entire planet in one day, it is an essential source of information for meteorologists and climatologists.
On March 3, he sent a cliche to say the least surprising and evocative. The Red Nile. This phenomenon can only recall a well-known episode of the 10 plagues of Egypt.
And the LORD said unto Moses, Say unto Aaron, Take thy rod, and stretch out thy hand over the waters of the Egyptians, and over their rivers, and over their streams, and over their ponds, and over all their heaps of waters. They shall become blood: and there shall be blood throughout all the land of Egypt, in the vessels of wood and in the vessels of stone.
But it is not. As surprising as these images may be, the explanation is rational. One of the 4 instruments which allow the measurements is a radiometer which measures the energy produced, across several spectra, including infrared. What we see in red is none other than the energy produced by the vegetation.
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