地理信息无缝表达模型与多尺度广义无缝技术研究

Gap is an inherent phenomenon of GIS. Achieving seamless is one of GIS's basic tasks. In recent years, seamless GIS and the seamless integration of spatial data have been received many attention among academics.Various kinds of gaps were investigated in literature, but they lack comprehensiveness and systematicness. This lead to an urgent need of research on connotation of seamless GIS. Multi-scale representation, as a typical problem of seamless GIS, has been a research hotpot around the world, but there has not been a breakthrough. This research will first build the restricted seamless and the generalized seamless representation models of geographical information through comprehensive analysis of various gaps. The models are based on the concepts of homologous points and homologous entities proposed in this topic. Secondly, we will research multi-scale problem from the point of view of seamless and put forward a series of metric methods of consistency of multi-scale spatial data. These methods will direct and control the structure process of multi-scale spatial database. Finally, we will study a semi-automatic construction technique for building a seamless multi-scale spatial database based on geographical object, on the background of practical application requirements, to achieve the purposes of seamless treatment in geometry, attribute and semantics. The research results in this topic will promote the development of multi-scale spatial data and push application of GIS to a deeper level. and they are of great theoretical importance and practical value.

缝隙问题是GIS本身的固有问题，实现无缝GIS是GIS研究的基本任务之一。长期以来，无缝GIS、无缝空间数据库一直吸引大量的学者进行研究，涉及无缝类别多种多样，但现有研究缺乏全面性、系统性，迫切需要探求无缝GIS的本质内涵。多尺度表达作为 .无缝GIS中的典型问题，是国际GIS的一个研究热点，但一直没有明显突破。本研究将从地理空间认知出发，通过综合分析GIS各种缝隙现象，以项目提出的时空同名点和同名对象为基础，建立狭义与广义无缝地理信息表达模型，从无缝的视角来深入研究地理空间信息多尺度问题，提出多尺度广义无缝的度量和评价方法，用于指导和约束多尺度空间数据库的构建，并以实际应用需求为背景，研究地理对象级多尺度无缝空间数据库的自动或半自动构建技术，达到地理对象在不同尺度下的空间、属性、语义等多方面无缝化。预期成果对促进多尺度的研究发展和深化推进GIS向深层次应用，具有重要的的理论与实际意义。

长期以来，无缝 GIS、无缝空间数据库一直吸引大量的学者进行研究，涉及无缝类别多种多样，但现有研究缺乏全面性、系统性，迫切需要探求无缝 GIS 的本质内涵。课题针对当前GIS 和空间数据库中对无缝问题缺少系统性研究的不足，综合分析了地理信息系统中空间信息的获取、表达、存储、管理、可视化与集成应用中存在的各种缝隙现象，从地理空间认知出发，探索了研究无缝地理信息的本质内涵，从空间数据角度梳理了并提出了地理信息狭义无缝表达模型和广义无缝表达模型；完成了以多尺度空间数据无缝表达与组织的研究工作，提出了多尺度广义相似性度量与评价方法、多尺度空间目标匹配和无缝化处理技术；提出并实现了动态多尺度广义无缝的几何表达结构；最后，课题组已将研究的理论与方法成果应用于浙江省多源多尺度海洋基础空间要素数据融合和同步更新系统，并取得了较好的应用效果。发表国内外核心期刊论文12篇，出版专著1部；课题组参加国内外学术交流会议达12人次；课题按计划执行期间，以课题内容作为研究方向，培养博士生5名，硕士生10名。完成研究目标的各项内容并达到预期目标。