因为信息被绑定在可以时时更新的数据上，一个静态地图在数小时内变得无关紧要。
Because the information was tied to constantly updated data, a static map would have become irrelevant within hours.
这一情景应当随着基础数据的变化而时时更新，这样，用户不但能够理解问题领域的现状，也能知道各项变化是如何影响该领域的。
This picture should be constantly updated as the underlying data changes, so the user understands not only the current state of the problem domain but also how changes affect the domain.
对此的制约因素是卫星图片，显然图片是需要。时时更新的。
The limiting factor is the satellite imagery-which obviously has to be up-to-date.
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