GreenRevolution
Gujarat, India
SatelliteImagery
Dams
Irrigation
Desertification
Figure 8
Scatter Plot of
SMA v. NDVI: The Saturation Effect
NDVI
Vegetation Values
-0.46 -0.09 0.28 0.64 1.01
Spectral Mixture Analysis Percent Live Cover
This
plot shows the values of each pixel in the subset area shown in Figure
7,
plotted by their vegetation values according to NDVI and SMA results. The major
areas where the majority of pixels do not correlate linearly between the two
methods are highlighted in red and blue. These pixels are highlighted in the
image in Figure 10. As you can see the red pixels correspond to areas of high
vegetation abundance or forests. This is what would be expected if SMA results
were similar to actual vegetation abundance and NDVI showed the classic
saturation problem at high levels of vegetation. Blue pixels correspond to water
and are not of great importance to vegetation abundance analysis.