Date:6 March 2014
On 19 February 2014, the Moderate Resolution Imaging Spectroradiometer (MODIS) aboard Nasa’s Aqua satellite flew over the Great Lakes and captured this striking image of the heavily frozen Great Lakes – one of the hardest freeze-ups in four decades.
This false-colour image uses a combination of shortwave infrared, near infrared and red (MODIS bands 7,2,1) to help distinguish ice from snow, water and clouds. Open, unfrozen water appears inky blue-black. Ice is pale blue, with thicker ice appearing brighter and thin, melting ice appearing a darker true-blue. Snow appears blue-green. Clouds are white to blue-green, with the colder or icy clouds appearing blue-green to blue.
Image credit: Nasa/Jeff Schmaltz, MODIS Land Rapid Response Team, Nasa GSFC
Source: MODIS Land Rapid Response Team | Nasa GSFC