%% $Date: 2012-07-06 17:42:54#$
%% $Revision: 148 $
\index{GI}
\algdescgeneral{GI}
%
{ %%%%%% Algorithm name %%%%%%
biophys\_indices (GI is one index calculated within the overall program)
}
%
{ %%%%%% Algorithm summary %%%%%%
Calculation of Greenness Index (GI)
}
%
{ %%%%%% Category %%%%%%
Biophysics - narrow band chlorophyll indices
}
%
{ %%%%%% Inputs %%%%%%
Narrow band multi- or hyperspectral imagery (ENVI standard image data) including channels close to the wavelengths of 549nm and 671nm.\bigskip
}
%
{ %%%%%% Outputs %%%%%%
Single band with GI values
}
%
{ %%%%%% Formula %%%%%%
\begin{displaymath}
GI = \frac{R_{671}}{R_{549}}
\end{displaymath}
}
%
{ %%%%%% Author %%%%%%
DLR-DFD
}
%
{ %%%%%% References %%%%%% 
Zarco – Tejada , P.J., Berjon, A., Lopez – Lozano, R., Miller, J.R., Martin, P., Cachorro, V., Gonzalez, M.R., de Frutos, A. (2005): Assessing vineyard condition with hyperspectral indices: Leaf and canopy reflectance simulation in a row-structured discontinuous canopy. In: remote Sensing of Environment, 99, p.271 – 287
}
