About Polygons and Rectangles

Polygons and rectangles delineate layer regions that are to have one of the following operations performed on them:

§ Clip - Cuts away the area outside the polygon.

§ Exclusion - Cuts away the area inside the polygon.

Note: Exclusion polygons are Clip polygons with the Apply Operation set to Outside Shape.

§ Fill Color/Elevation- Fills the polygon area. In image layers, the filling is a color whereas in elevation layers, the filling is an elevation value.

§ Null Value - Erases a selected color or elevation value within the polygon area.

Polygons have two Shape Types:

§ Polygon - A general polygon. A closed shape with straight sides. The number of sides is unlimited.

§ Rectangle - A specific polygon with four sides and 90° angles.

Polygon operations can be implemented:

§ Inside Shape - The polygon operation is performed only inside the polygon.

§ Outside Shape – The polygon operation is performed everywhere on the layer except inside the polygon.

Polygon markings are as follows:

Marking	Description
Light green border	Indicates the boundaries of a polygon or rectangle attached to layers that are currently in Edit mode.
Dark green border	Indicates the boundaries of a polygon or rectangle attached to layers that are currently not in Edit mode.
White border	Indicates a polygon or rectangle is selected.
Yellow border	Indicates a polygon’s feather boundary.
Blue frame with white arrows	Indicates the layer(s) a selected polygon is attached to.

Note: One polygon can be attached to many layers and each layer can have many polygons attached to it. A polygon can be edited if a layer it is attached to is in Edit mode.