Pitney Bowes MapXtreme - Manual (Page 272)

Chapter 14: Using Themes and Legends
Thematics Overview
MapXtreme v7.1 279 Developer Guide
Thematics Overview
Thematic mapping allows you to present trends in data that would be difficult to see from tabular
data. The theme is usually some piece or pieces of your data. You thematically shade a map using
data from a data source, such as a native MapInfo table. For example, you can thematically shade a
map of the United States based on the average temperature of each state. When you see red, you
know it is hot (high number of degrees); where you see blue, it is cold (low number of degrees).
Themes represent your data with shades of color, fill patterns, or symbols. There are many uses for
thematic maps to display your data. You create different thematic maps by assigning these colors,
patterns, or symbols to map objects according to specific values in your data.
Mapping.Thematics Namespace
The MapInfo.Mapping.Thematics namespace contains classes that implement themes as style
overrides on Feature layers and as Object themes. Modifier themes change the style, while object
themes add a new layer. All themes implement the ITheme interface.
Modifier Themes
An example of a feature modifier theme are ranged, individual value and dot density thematic maps.
They modify existing features in a layer. The following UML diagram gives an overview of the
modifier theme hierarchy.