In this lesson, you overlay
two layers. One layer represents the flood zone in Redding, California.
The other layer represents the enterprise (business) zone in that
city. You add and label road data to see which streets are affected. Then
you add a layer representing local hospitals. Use a buffer to see
which streets are farthest from help in the event of a flood.
a layer representing the area where two existing layers intersect.
Use Overlay to compare two layers
that overlap in space.
You can choose from various
overlay types, including the following:
- Intersect shows
just the areas that the two layers have in common.
- Union shows
the sum perimeter of the layers.
- Clip removes
areas outside the shared area.
- Erase removes
the shared areas and leaves the rest.
For a complete description
of the overlay types, see Overlaying Two Feature Sources.
For a tutorial on how
to automate the overlay process using a workflow, see Lesson 5: Automate an Overlay Operation with a Workflow.