SPLIT ENHANCEMENT.—For
split
enhancements, two ranges are also selected. For each,
the complete gray-shade and count value scale applies.
This means that the complete gray shade scale is
applied twice over the image, except for temperatures
lying between the two defined ranges. Figure 1-18
displays a split enhancement curve for temperatures of
+30°C to 0°C and -10°C to -30°C. Areas colder than
the lower minimum temperature will appear white.
Areas warmer than the higher maximum temperature
will appear black.
Areas which are temperatures
between the upper and lower ranges will appear gray.
Predefined Enhancement
Curves
application. One of the most common is the MB
Curve. This is a very good, all-purpose curve, but was
specifically designed for summertime convective
activity. The MB curve has very distinct contours
(thresholding) around specific temperatures, and is
especially helpful in picking out thunderstorms.
Figure 1-19 shows the configuration of the MB curve.
The GOES User’s Guide contains detailed information
on various predefined enhancement curves.
Visible imagery can also be enhanced by adjusting
brightness values vice temperature values as with IR
imagery.
Enhanced visible imagery is especially
useful in cases of fog and thick stratus.
GOES LEGEND INFORMATION
Besides locally developed enhancement curves,
Much information about a particular GOES
there are several predefined enhancement curves
satellite image is available from the GOES legend that
available for GOES imagery that have been tested and
appears at the top of each image received over the
evaluated over many years.
Each of these
GOES Telecommunications Access Program (GOES-
enhancements was developed for a specific
TAP). An example of a GOES legend is shown at the
Figure 1-18.—Split enhancement curve.
1-18
