The sharp reflectance change between the red and near-infrared region is called the red edge. If green chlorophyll is decayed, the red wavelengths are no longer absorbed. Geobotanical processing will look at stressed vegetation by analyzing this red-edge shift or variation. The figure below represents healthy green and stressed vegetation spectra to illustrate their reflectance and absorption characteristics. Hydrocarbon processing techniques have used a three-channel ratio around the bitumen absorption feature at 2.31mm.
Areas dominated by vegetation are difficult to analyze.
Asphalt surfaces provide good correlation between high values. Processing looked at the possibility of a hyperspectral signature associated with seepage and tying those similar spectral signatures to those found in other unknown seep areas. It can be viewed in Word document format for your convenience.