Some times it can be difficult to understand the elevation of your design, particularly when viewing your design from the Top, or Isometric view. To help visualize your model a Thematic Height Display Style can be used to display your model in banded colours with each colour representing a different elevation range.
In this example the low lying area can be seen in blue and the high points shown in red, this being useful in determining where water may collect, flood by adjusting the various colours height range.
in this example we have a Terrain element and are interested in visualizing the whole model. (But the Z range could be a smaller portion)
Blog Display Rules Series Part 1: Thematic Mapping