%% $Date: 2012-07-06 17:42:54#$
%% $Revision: 148 $
\index{NDNI}
\algdescgeneral{NDNI}
%
{ %%%%%% Algorithm name %%%%%%
biophys\_indices (NDNI is one index calculated within the overall program)
}
%
{ %%%%%% Algorithm summary %%%%%%
Calculation of Normalized Difference Nitrogen Index (NDNI)
}
%
{ %%%%%% Category %%%%%%
Biophysics - dry vegetation (stress) indices
}
%
{ %%%%%% Inputs %%%%%%
Narrow band multi- or hyperspectral imagery (ENVI standard image data) including channels close to the wavelengths of 1510nm and 1680nm.\bigskip
}
%
{ %%%%%% Outputs %%%%%%
Single band with NDNI values
}
%
{ %%%%%% Formula %%%%%%
\begin{displaymath}
NDNI = \frac{log\frac{1}{R_{1510}}- log\frac{1}{R_{1680}} } {log\frac{1}{R_{1510}} + log\frac{1}{R_{1680}}}
\end{displaymath}
}
%
{ %%%%%% Author %%%%%%
DLR-DFD
}
%
{ %%%%%% References %%%%%% 
Serrano, L., Penuelas, J., Ustin, L.S. (2002): Remote sensing of nitrogen and lignin in Mediterranean vegetaion from AVIRIS data: Decomposing biochemical from structural signals. In: Remote Sensing of Environment, 81, p.355-364
}
