%% $Date: 2012-07-06 17:42:54#$
%% $Revision: 148 $
\index{NDWI}
\algdescgeneral{NDWI}
%
{ %%%%%% Algorithm name %%%%%%
biophys\_indices (NDWI is one index calculated within the overall program)
}
%
{ %%%%%% Algorithm summary %%%%%%
Calculation of Normalized Difference Water Index (NDWI)
}
%
{ %%%%%% Category %%%%%%
Biophysics - water (stress) indices
}
%
{ %%%%%% Inputs %%%%%%
Narrow band multi- or hyperspectral imagery (ENVI standard image data) including channels close to the wavelengths of 864nm and 1245nm.\bigskip
}
%
{ %%%%%% Outputs %%%%%%
Single band with NDWI values
}
%
{ %%%%%% Formula %%%%%%
\begin{displaymath}
NDWI = \frac{R_{864}-R_{1245}}{R_{864}+R_{1245}}
\end{displaymath}
}
%
{ %%%%%% Author %%%%%%
DLR-DFD
}
%
{ %%%%%% References %%%%%% 
Gao, Bo-Cai (1996): NDWI – A Normalized Difference Water Index for Remote Sensingof Vegetation liquid Water from Space. In: Remote Sensing of Environment, 58, p.257-266
}
