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Fig. 6.3.
Squarified Treemap for rainfall data.
Fig. 6.4.
Edge-Equalized Treemap for rainfall data.
Margin at the top of the rectangle:
To compare multiple charts, the scale
intervals of their axes should be equalized.
The leaf rectangles in Fig. 6.3 have various heights. In particular, the
maximum value of the vertical axis is extremely large, necessitating a bar
chart drawn in a very tall rectangle. Therefore, unused space remains at the
top of the leaf rectangles, and thus the drawing area is not used efficiently.
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