基于XML的农业专题空间数据同步模型

Synchronization model of agricultural spatial data based on XML

为了克服移动环境下大容量农业专题空间数据同步效率低下的问题,提出了面向农业专题空间数据的4元组同步模型(MCOD),描述了农业地理要素的基本时空变化类型、同步数据内容、同步操作和同步元数据以及相互之间的关系。模型以农业地理要素的11种基本时空变化类型为基础,通过分析每种基本时空变化类型对应的同步数据内容和同步操作建立3者之间的关系,为客户端的同步处理提供了描述农业地理要素演化过程、同步操作符和同步数据内容的数据源。并实现同步模型元素的XML描述,以XML格式实现同步数据源的传播,提高了该方法的适用性。

In order to improve the synchronization efficiency of the high-capacity agricultural spatial data in the wireless network,a new 4-tuple synchronization model(MCOD)is proposed.The model represents the relationships among the four elements,such as the atomic change types,synchronized data,synchronized operations and synchronized metadata. To establish the model,a new typology with 11 atomic change types of the agricultural features is firstly proposed.Based on the typology,the corresponding synchronized data and operation of every change type are given.An instance of the model is realized by establishing the relationships among the change types,corresponding data and operation of all changed agricultural features.At last,the corresponding relation between elements of the synchronization model and XML model is given.Thus,the model can be automatically described as XML data files which make it perfect for transferring data between servers and mobile clients.