def modis_ws_alb_mcd43b1(fiso, fvol, fgeo):
    """
    Calculate white-sky albedo from MODIS BRDF parameters.

    Parameters:
    fiso, fvol, fgeo : numpy arrays of the same dimension 

    Returns:
    ws_alb : numpy array
    """
	
    ws_alb = fiso + 0.189184 * fvol - 1.377622 * fgeo
    return ws_alb