HD Enhancement Curve

Operational Products Development Branch (NOAA/NESDIS)

The graph below shows how the gray scale intensities for the HD curve vary with input brightness temperature (deg C).

HD Graph

Here is a table showing output gray scale values versus input brightness ranges and Band 4 (10.7 mm) IR temperatures for the HD curve

Segment
Input
Temp Range
Gray levels
Feature
0
0-58
+50 to +27.8K
0
 No information
1
59 - 82
+27.3 to 15.8 K
0 - 50
 Land/water
2
83-114
+15.3 to 0.3 K
50-210
 Water and low clouds
3
115-119
-0.2 to -2.7 K
0
 Freezing zone
4
120-174
-3.2 to -30.2 K
100-255
 Mid-tropospheric fronts
5
174-186
-30.7 to -41.2 K
60
 Dark gray
6
187-198
-42.2 to -53.2 K
110
 Medium gray
7
199-208
-54.2 to -63.2 K
160
 Light gray
8
209-214
-64.2 to -69.2 K
0
 Black
9
215-220
-70.2 to -75.2 K
255
 White
10
221-225
-76.2 to -80.2 K
140
 Medium gray
11
226-231
-81.2 to -86.2 K
100
 Dark gray
12
232-255
-87.2 to -110.2 K
0
 Black

For further information please contact: Gary Ellrod