def ndwi(self):
        """
        Calculates Normalized Difference Water Index using Coastal and NIR2 bands for WV02, WV03.
        For Landsat8 and sentinel2 calculated by using Green and NIR bands.

        Returns: numpy array of ndwi values
        """
        data = self._read(self[self._ndwi_bands,...]).astype(np.float32)
        return (data[1,:,:] - data[0,:,:]) / (data[0,:,:] + data[1,:,:])
def ndwi(self):
        """
        Calculates Normalized Difference Water Index using Coastal and NIR2 bands for WV02, WV03.
        For Landsat8 and sentinel2 calculated by using Green and NIR bands.

        Returns: numpy array of ndwi values
        """
        data = self._read(self[self._ndwi_bands,...]).astype(np.float32)
        return (data[1,:,:] - data[0,:,:]) / (data[0,:,:] + data[1,:,:])
def ndwi ( self ) : data = self . _read ( self [ self . _ndwi_bands , ... ] ) . astype ( np . float32 ) return ( data [ 1 , : , : ] - data [ 0 , : , : ] ) / ( data [ 0 , : , : ] + data [ 1 , : , : ] )
Calculates Normalized Difference Water Index using Coastal and NIR2 bands for WV02, WV03.
        For Landsat8 and sentinel2 calculated by using Green and NIR bands.

        Returns: numpy array of ndwi values
Calculates Normalized Difference Water Index using Coastal and NIR2 bands for WV02 WV03 . For Landsat8 and sentinel2 calculated by using Green and NIR bands .