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OWA in TerrSet

I wanted to know how the OWA in MCE module works in TerrSet. 

I have three factor maps Wind, Grid and Road.

The factor values for a selected pixel in this case is wind = 1, Grid = 0.4866 and Road = 0.

The factor weights are, Wind = 0.6, Grid = 0.3 and Road = 0.1

I gave ordered weights as weight1 = 0.7, weight2 = 0.2 and weight3 = 0.1 

The final OWA result for that pixel is 0.2822.

How is this calculated?

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