GML土地利用空间数据查询与应用  

Query and application of GML-based land use spatial data

作　　者：吴宝佑[1] 张山山[1] 姚封[1] 

机构地区：[1]中南大学地学与环境工程学院,长沙410083

出　　处：《测绘科学》2011年第3期222-225,共4页Science of Surveying and Mapping

基　　金：湖南省自然科学基金资助项目(07JJ6076)

摘　　要：本文以全国第二次土地调查中的土地利用数据为例,根据国家标准GML 3.2规范,提出了基于GML的土地利用数据模型;针对传统的符合W 3C标准的XML查询语言XQuery不能进行空间查询的问题,提出了一种在Saxon开源版本的XQuery引擎基础上扩展空间函数功能进而对GML数据进行空间查询的方法,并探讨了基于GML和XQuery的土地利用空间对象的查询模式;基于C语言、文档对象模型、XQuery和Saxon实现了一个GML的土地利用查询系统,验证了设计的模型和提出的查询方法的可行性与可靠性。In this paper a land use data model which is based on GML and accorded to the national standards of GML 3.2 was proposed,and the data derived from the Second National Land Survey were taken for the example.Because it is difficult for traditional XML query language to query spatial data,a new spatial query method for GML data which is based on the open source version of Saxon XQuery Engine to extent spatial query method was raised in this paper,and then investigate the land use spatial object query model based on GML and XQuery.A GML query system for land use was developed based on C,DOM,XQuery and Saxon,and the result showed that land use data model based on GML and the query method based on XQuery and Saxon,which query spatial data and spatial relationshi Pbetween land use spatial objects based on GML,is valid and reliable.

关 键 词：GML XQUERY Saxon 空间查询扩展 

分 类 号：P208[天文地球—地图制图学与地理信息工程]