2011

Table Of Contents
DefinitionTerm
Process of recalculating which boundaries are outer or inner.
Nested boundaries are alternately classified as outer and inner.
Balancing
That is, the outermost boundary is classified as an outer
boundary. A boundary nested within this boundary is an inner
boundary. A boundary nested within the inner boundary is
classified as an outer boundary.
Nested boundary that is totally within an outer boundary.Inner boundary
The outermost boundary for any discreet set of boundaries that
define the polygon, or a boundary residing within an inner
Outer boundary
boundary. A polygon can have several unnested outer boundaries
and several nested outer boundaries.
Understanding Boundaries
The figure below shows two polygon objects, each with three boundaries. The
one on the left has two discrete outer boundaries and one inner boundary.
The inner boundary is nested within the second discrete outer boundary. The
polygon on the right also has two outer boundaries and one inner boundary.
However, the second outer boundary is nested within the inner boundary.
Polygon objects maintain a tree structure to keep track of the boundaries and
identify nesting levels. The illustration below shows the different tree structures
for the two objects shown above. The first polygon tree contains two branches,
while the second polygon tree contains a single branch.
956 | Chapter 6 Creating and Editing Data