Pitney Bowes MapXtreme - Manual (Page 62)

Chapter 3: Mapping Concepts
Mapping and MapXtreme
MapXtreme v7.1 62 Developer Guide
Other text elements can also be used in a map to help deliver its message properly. Legends are
cartographic elements that describe the features in a coded manner. For example, the legend may
describe the boundaries as school districts, the lines as a power line network, or points as corporate
office locations. Legends also contain a title to describe collectively what the map represents.
In MapXtreme, legends are part of the Adornments class, along with map titles and scalebars.
Adornments reside in the MapInfo.Mapping namespace.
Themes
Computer maps are not only useful for visibly showing spatial relationships among the map features,
but you can analyze the underlying data that is associated with the features to learn more about
what you see. A common analytical technique is to create a theme based on a feature layer in which
the data is ranked in specific ways. For example, a ranged theme shows color blocks where each
color represents features on the map that meet the same criteria. A graduated symbol theme is
useful for showing distributions of populations for example, with the largest symbol representing the
largest population.