Visible -vs- Infrared Images
comparison and contrast
Images (a) and (b) are examples of visible
and infrared satellite images
respectively (valid for the same time).
Visible images measure
scattered light and the example
here depicts a wide line of clouds stretching across the southeastern United States and then northward into Ontario and Quebec.
||In contrast, infrared images are related
Therefore, the clouds over Louisiana, Mississippi, and western Tennessee
in image (a) appear gray in the infrared
image (b) because of they are lower and have relatively warm cloud tops.
The warmer the temperature, the lower the clouds, the darker the color.
From Alabama northeastward into New York is a region of
deep convective clouds
that appear bright white in both pictures.
Because of their higher cloud
tops, these clouds are bright white in both images because of their high
reflectivity and extremely cold cloud top temperatures.
The clouds in Canada
probably high thinner cirrus and
They have lower reflectivities and therefore
appear somewhat darker in the visible image (a)
but because of their higher
altitudes and colder cloud tops, they appear bright white in the
infrared image (b).
color enhanced ir