Discussion
A prism map, or three-dimensional choropleth, raises each areal unit to a height proportional to its value. Its principal weakness is that
Answer: A
Correct answer: taller units hide the ones behind them
Raising the units into prisms puts them in front of one another, so a tall unit occludes whatever lies behind it from the chosen viewpoint. Values in the obscured units cannot be read at all, and the map must be rotated or re-drawn to reveal them. The technique also makes heights hard to compare across the sheet because of perspective, which is why it is more often decorative than analytical.
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