Submitted to: Proceedings of SPIE
Publication Type: Proceedings
Publication Acceptance Date: August 1, 2010
Publication Date: November 10, 2010
Citation: Hunt, E.R., Long, D.S., Eitel, J.U., Daughtry, C.S. 2010. Remote sensing of leaf chlorophyll content at multiple scales using red, green and blue bands. In: Proceedings of International Society of Optical Engineering, August 1-5, 2010, San Diego, California. Paper No. 7809-1. Technical Abstract: Leaf chlorophyll content is an important variable for agricultural remote sensing because of its close relationship to leaf nitrogen content. We propose a triangular greenness index (TGI), which calculates the area of a triangle with three points: ('r, Rr), ('g, Rg), and ('b, Rb). TGI was correlated with chlorophyll content using a variety of leaf and plot reflectance data. However, indices using the chlorophyll red-edge (710-730 nm) generally had higher correlations. With broad bands, TGI had higher correlations than other indices at leaf and canopy scales. Simulations using a canopy reflectance model indicate an interaction among TGI, leaf area index (LAI) and soil type at low crop LAI, whereas at high crop LAI, TGI was only affected by leaf chlorophyll content. Excess nitrogen fertilizer causes numerous environmental problems, nitrogen management using remote sensing will help balance fertilizer applications with crop nitrogen requirements.