Blue is cool and pink is hot in this infrared photograph.
Hot-pink riverbanks and beaches outline the black, colder water of the river system. When water turns to mist at the various falls and rapids, it quickly goes from river-cold to nearly air-temperature, resulting in other bright pink areas.
It’s unusual to find an infrared photo with this much fine detail. It was taken at about 4pm on a clear summer day.
This photo was taken by an astronaut aboard the International Space Station during Expedition 31 in 2012.
Original (raw) image courtesy of the Earth Science and Remote Sensing Unit, NASA Johnson Space Center.
Niagara in Heat