基于地理事件和更新操作的地理要素增量变化分类

Classification on changes of geographical features based on geographical event and update operations

为了解决以增量方式实现空间数据生产者和用户之间更新信息的传播需要解决地理空间要素增量变化的表达问题,将地理空间要素增量变化定义为影响要素变化的地理事件和实施数据库更新操作的因果关系体,提出了基于地理事件和更新操作的增量变化表达双层概念模型,建立了分裂、消失、合并等地理事件与删除、添加等更新操作以及数据差之间的固定映射关系,即建立了地理要素增量变化的分类模型,为增量信息的提取与分发提供了方法依据。

In order to distribute the update information in an incremental way,a rational expression method should be investigated.The changes of geographical feature reflect the causal relationship between geographical events and update operations.The changes are resulted from the geographical events in the objective world and the geographical events in the data world by update operation.In this paper,a double-layer model of incremental change expression is proposed based on geographical events and update operations.The model uses geographical event type to express the semantics of incremental changes and uses update operation types to express data delta.This model not only eliminates the diversity problem of data difference expression caused by incremental changes,but also eliminates the ambiguity of incremental change expression.Therefore,various incremental changes and their related increment can be clearly distinguished to facilitate the incremental extraction and releases.