MSGID: 1:317/3 636e8dc9   
   PID: hpt/lnx 1.9.0-cur 2019-01-08   
   TID: hpt/lnx 1.9.0-cur 2019-01-08   
   November 11, 2022 - Fog and Snow in Canadian Rockies   
      
      Fog   
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      On November 9, 2022, the Canadian Rockies were washed in shades of   
      white and gray in this true-color image acquired by the Moderate   
      Resolution Imaging Spectroradiometer (MODIS) on board NASA’s Terra   
      satellite.   
      
      These shades are typical on snowy days in the Rockies, when a light   
      coat of snow coats vegetation, heavy snow sits in high elevations, and   
      fog fills the valleys. In true-color images, it is sometimes easier to   
      use texture rather than color to sort out white-toned surfaces. For   
      example, fog (low cloud) is liquid water while snow is frozen ice   
      crystals. Fog droplets are much smaller than crystals of ice, and these   
      differences can be seen in the softer texture of the fog. Deep snow   
      tends to have a relatively smooth surface, so it reflects light back   
      strongly and appears bright white. Both the round droplets that make up   
      fog and the variable texture of light snow sitting atop grasses or   
      trees reflect light in varying directions, and less directly back to   
      the sensor, so they appear much less bright than deep snow and may even   
      look gray in true-color images.   
      
      Although the texture and brightness in true-color images are useful,   
      when scientists want to more clearly understand where snow stops and   
      fog begins, they turn to false-color images. The image directly below   
      our true-color Image of the Day is the false-color version of the same   
      image. The false-color image uses infrared and visible light (MODIS   
      bands 7,2,1) while the true-color image is created by visible light   
      (MODIS bands 4,3,1). While the true-color image shows shades of white   
      and gray, the false color image is quite bright and it is simple to   
      separate fog, cloud, liquid ground water, and vegetation. Fog looks   
      white, snow appears electric blue, while deep water (rivers, streams,   
      and lakes) looks deep blue. Vegetation looks bright green and open soil   
      would appear tan. Where light snow sits atop vegetation, the colors of   
      the predominant land cover may appear strongest or the area may be   
      tinted blue-green.   
      
      Image Facts   
      Satellite:  Terra   
      Date Acquired: 11/9/2022   
      Resolutions:  1km (553.7 KB),  500m (1.4 MB),  250m (1.2 MB)   
      Bands Used: 1,4,3 and 7,2,1   
      Image Credit: MODIS Land Rapid Response Team, NASA GSFC   
      
      
      
   https://modis.gsfc.nasa.gov/gallery/individual.php?db_date=2022-11-11   
       
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