Regions can be discontinuous. A set of discontinous polygons like all the islands in the Alleutian Chain can be represented as one region. Regions can be nested. Regions allow for faster vector analysis. Since regions are composed of base polygons, questions concerning these polygons can be analyzed much more efficiently compared to storing each region subclass as a separate coverage.
Regions are perfect for asking questions concerning intersection, adjacency, and containment.
In this lab you will use tools to display and analyze regions and perform tablular analysis. A hydrologist has developed a snowmelt model. You will compare the weekly prediction of a snow melt model compared to the actual distribution of snow on the ground. A soil scientist is interested in soil nitrogen dynamics of spruce versus balsam poplar sites. Your job is to generate a map showing these adjacent arcs.