According to the theory of areal economy system, the state of an areal economy unit can be expressed with the features of time series of the economic development and spatial structure.
依据地域经济系统理论，一个地域经济单元状态，可以从时序特征和空间结构特征进行表达，其存在状态受制于时空关联性。
Some of these maps illustrate the temporal pattern of the subject over a defined period of time while others show finer spatial details through a series of maps drawn in larger scale.
每组地图显示主题在某特定时期内的空间分布情况的变化，或透过一系列高比例的地图显示更多资料细节。
Space-for-time substitution is an important method to study succession, while it needs intact spatial succession series.
丹霞地貌区存在着完整的原生演替与次生演替系列。
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