Normalized Difference Red Edge Index
Metric in biology From Wikipedia, the free encyclopedia
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.[1] It does this by measuring the amount of chlorophyll in a plant.[2]
It is similar to Normalized Difference Vegetation Index (NDVI) but uses the ratio of Near-Infrared and the edge of Red as follows:[3]
The red edge is the part of the spectrum centred around 715 nm.
The Index will give a value between -1.0 to +1.0, with a higher value showing a healthy plant environment.[3]
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