【摘要】 数据变更功能是土地利用数据库系统的最重要功能之一。土地利用数据是一种时空数据,具有变更频繁的特点。数据变更时,要解决好图形与属性变化的各种操作外,还要保存历史数据信息并实现回溯。本文分析了土地要素和土地利用数据变更的各种类型,并从技术层面上探讨了土地利用数据库变更原理、变更准则、变更实现、变更编号规则和变更数据历史回溯等技术方法,提出了适于土地利用数据库变更功能开发的关键技术。更多还原

【Abstract】 The function to change data is one of the most important functions in the land-use database system.Bing a kind of spatio-temporal data,land-use data has the multifarious characteristics of alteration.While making various graphics and attribute edition,it’s needed to keep the history data during data changing.Features of land-use data and types of entity change in a land-use database have been analyzed in this paper.And the principle of the database alteration,the standard of land-use data change,the realization of land-use data change,the change rule of the identification number of land-use entity and the trace of historical entity have been discussed.Key technique suited for function development of land-use database alteration is put forward.更多还原