2011

NOTE All the overlay analysis operators change arcs into a series of line segments;
for example, a complete circle consists of 32 segments. In the examples shown
above, the result topology is a tessellated (or jagged) circle after overlay analysis.
This may affect properties of the result topology, and gives different values, such
as area and perimeter.
Intersect
Intersect operations combine topologies and keep only the common geometry.
Intersect acts like the Boolean AND operation. The results are the same
whichever topology is chosen as the first or second. Object data is combined
for the two operations.
Here are some examples of using Intersect:
■ Which parcels (polygons) fall within 100-year flood zones (polygons)?
Intersect shows only the flooded properties, not the whole property.
■ Which crimes (nodes) fall within drug-free zones (polygons)?
■ Which stream sections (networks) fall within the building area (polygons)
and need to be examined for potential negative environmental impact?
Overlaying Two Topologies | 1337