GreenRevolution
Gujarat, India
SatelliteImagery
Dams
Irrigation
Desertification
Figure 3
The
representative spectral signatures of vegetation, dry grass and soil are shown
above over the visible through infrared wavelengths. Vegetation is unique in the
extreme difference of reflectance values at the visible red
(.6 -.7um) verses the near infrared (.7-1.1). It is this difference that is used to estimate vegetation through NDVI.