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.
[Barnes, E. M., Clarke, T. R., Richards, S. E., Colaizzi, P. D., Haberland, J., Kostrzewski, M., ... & Lascano, R. J. (2000, July). Coincident detection of crop water stress, nitrogen status and canopy density using ground based multispectral data. In Proceedings of the Fifth International Conference on Precision Agriculture, Bloomington, MN, USA (Vol. 1619). https://naldc.nal.usda.gov/download/4190/PDF] 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 part of the
spectrum centred around 715 nm.
References
External links
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
*Barnes, T.R., Clarke, S.E. Richards et. al. 2000. COINCIDENT DETECTION OF CROP WATER STRESS, NITROGEN STATUS AND CANOPY DENSITY USING GROUND-BASED MULTISPECTRAL DATA. Proceedings of the Fifth International Conference on Precision Agriculture
Satellite meteorology
Remote sensing
Biogeography
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