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Remote Sensing

Geospatial Analysis

Vegetation Mapping

Surface Modeling

Satellite Imagery

Scientific Papers

Mapping Vegetation with Satellite Imagery and Derived Products

Vegetation absorbs light as part of the photosynthesis process.

6H20 + 6C02 + light = C6H12O6 + 6O2

The reflectance pattern of green vegetation in the visible wavelengths is due to selective absorption by chlorophyll, the primary photosynthetic pigment in green plants. Plant reflectance in the range 700 to 1,300 nm results primarily from the internal structure of plant leaves. It is a well known fact that the spectral shape and reflectance of green vegetation is sensitive to damage.

The reflectance of healthy vegetation increases as we go from the visible to the near-infrared portion of the spectrum at about 700 nm. Various mathematical combinations of the near infrared (NIR) channel and the red channel have been found to be sensitive indicators of the presence and condition of green vegetation. These mathematical quantities are thus referred to as vegetation indices. Vegetation indices may be used as an indicator of relative biomass and greenness. Mapping relative biomass or greenness for harvesting the "cream of the crop."