Normalized Difference Red Edge Index

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The normalized difference red edge index (NDRE) is a metric that can be used to analyse whether images obtained from multi-spectral image sensors contain healthy vegetation or not. It is similar to Normalized Difference Vegetation Index (NDVI) but uses the ratio of Near-Infrared and the edge of Red as follows:

The red edge is the term used to describe the part of the spectrum centred around 715 nm.

External links[edit]

  • Background on NDRE
  • Chlorophyll Absorption
  • Spectral Reflectance Changes Associated with Autumn Senescence of Aesculus hippocastanum L. and Acer platanoides L. Leaves. Spectral Features and Relation to Chlorophyll Estimation