But due to the inherent characteristics of the multi data source, multi type, multi temporal and multi resolution, one data mining system to excavate all types of weather data is unrealistic.
但由于气象数据的多数据源、多类型、多时相、多分辨率等固有的特点，指望一个数据挖掘系统挖掘所有类型的气象数据是不现实的。
This paper first introduces the concept of all-weather pedestrian system and three all-weather facility types, elevated, ground and underground system.
首先介绍了全天候步行系统的概念以及高架、地面、地下三种形式。
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