function [Islope Ivolume duneHeight beachwidth] = debn_profileindicators(x, z, varargin)
%DEBN_PROFILEINDICATORS  One line description goes here.
%
%   More detailed description goes here.
%
%   Syntax:
%   varargout = debn_profileindicators(varargin)
%
%   Input:
%   varargin  =
%
%   Output:
%   varargout =
%
%   Example
%   debn_profileindicators
%
%   See also 

%% Copyright notice
%   --------------------------------------------------------------------
%   Copyright (C) 2012 Delft University of Technology
%       Kees den Heijer
%
%       C.denHeijer@TUDelft.nl	
%
%       Faculty of Civil Engineering and Geosciences
%       P.O. Box 5048
%       2600 GA Delft
%       The Netherlands
%
%   This library is free software: you can redistribute it and/or modify
%   it under the terms of the GNU General Public License as published by
%   the Free Software Foundation, either version 3 of the License, or
%   (at your option) any later version.
%
%   This library is distributed in the hope that it will be useful,
%   but WITHOUT ANY WARRANTY; without even the implied warranty of
%   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
%   GNU General Public License for more details.
%
%   You should have received a copy of the GNU General Public License
%   along with this library.  If not, see <http://www.gnu.org/licenses/>.
%   --------------------------------------------------------------------

% This tool is part of <a href="http://www.OpenEarth.eu">OpenEarthTools</a>.
% OpenEarthTools is an online collaboration to share and manage data and 
% programming tools in an open source, version controlled environment.
% Sign up to recieve regular updates of this function, and to contribute 
% your own tools.

%% Version <http://svnbook.red-bean.com/en/1.5/svn.advanced.props.special.keywords.html>
% Created: 14 Mar 2012
% Created with Matlab version: 7.7.0.471 (R2008b)

% $Id$
% $Date$
% $Author$
% $Revision$
% $HeadURL$
% $Keywords: $

%%
OPT = struct(...
    'uppercontour', 3,...
    'lowercontour', -4,...
    'lowerbeachcontour', 1,...
    'positiveseaward', true);

OPT = setproperty(OPT, varargin);

%%
idup = find(z > OPT.uppercontour, 1, 'last');
xup = interp1(z(idup+(0:1)), x(idup+(0:1)), OPT.uppercontour);
idlow = find(z > OPT.lowercontour, 1, 'last');
xlow = interp1(z(idlow+(0:1)), x(idlow+(0:1)), OPT.lowercontour);

dh = OPT.uppercontour - OPT.lowercontour;
dx = xlow - xup;

Islope = dh / dx;

V = jarkus_getVolume(x, z,...
    'LowerBoundary', OPT.lowercontour,...
    'LandwardBoundary', xup);

Ivolume = V / dh / dx;

[duneHeight ixh] = nanmax(z);

idb = find(z > OPT.lowerbeachcontour, 1, 'last');
xb = interp1(z(idb+(0:1)), x(idb+(0:1)), OPT.lowerbeachcontour);

beachwidth = xb - x(ixh);