When you select Defined by polygons in the Mosaic output list, the page refreshes to provide you with the ability to to select the polygon file, segment, and field.
To set up a mosaic defined by polygons
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In the Polygon file box, enter the path and file name of the file continaing the polygons you want or, to select a file, click Browse.
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In the Segment list, select the segment of the file containing the polygon field or fields you want.
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In the Field list, select the field containing the polygon you want.
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Proceed to Selecting and mapping channels.