Details

Autor(en) / Beteiligte

• Li, Y
• Demetriades-Shah, T.H
• Kanemasu, E.T
• Shultis, J.K
• Kirkham, M.B

Titel

Use of second derivatives of canopy reflectance for monitoring prairie vegetation over different soil backgrounds

Ist Teil von

• Remote sensing of environment, 1993, Vol.44 (1), p.81-87

Ort / Verlag

New York, NY: Elsevier Inc

Erscheinungsjahr

1993

Quelle

Elsevier Journal Backfiles on ScienceDirect (DFG Nationallizenzen)

Beschreibungen/Notizen

• Spectral derivative indices were compared with the commonly used near-infrared to red reflectance ratio ( NIR red ) and the normalized difference (ND) spectral indices. Two “windows” of second derivatives, ρ″ 0.69 μm and ρ″ 0.74 μm , exist in the visible and NIR spectral regions, which can be used to estimate vegetation characteristics such as percent cover and leaf area index (LAI). Second derivatives centered on the red and NIR wavebands (MSS Bands 3 and 4) were calculated using broadband radiometer data for grassland sites which had been previously burned or had been left unburned for several years. The second derivative indices minimized the effect of the soil background differences caused by the prior burning treatments, and clearly showed the advantages of the derivative technique over the conventional NIR red ratio and ND spectral indices.