LC Enhancement

The LC curve is used on images from the 3.9 micron shortwave infrared channel (CH2) of
GOES.  It provides maximum enhancement in the temperature range where fog and low clouds
typically occur (36C to -9C).  Another enhanced thermal range is from -10C to -29C, 
 the region of precipitation generation in mid-latitude weather systems.  Since CH2 is sensitive
to "hot spots," a steep, reverse ramp is found at the warm end (68C to 50C) to show any
observable fires as white.  There is no enhancement at the very cold end (-30 to -67C), 
due to the instrument noise normally present at these temperatures.
