Geoscience Reference
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Figure 8: Sharp display of areas exceeding critical noise limits while unconcerned areas are
blurred
5.9 Rhythm
Concerning the visual encoding of spatio-temporal rhythm, we compose a
geometric point symbol as the parameter refers to spatially discrete sound
sources. We draft an abstracted clock as a familiar metaphor and divide its
surface into adequate or requested time units, such as one hour or one day.
Then, we chart temporal variations of sound energy on the clock by
saturating the source's hue according to the emitted energy at a specific
time ( Fig. 9 ). This encoding allows for the static visualization of spatio-
temporal rhythm of stationary sound sources and enables their presentation
on maps as point symbols with showing other topographical objects
simultaneously.
Figure 9: Geometric point symbols reveal temporal variations of sound energy
 
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