Multi-resolution seamless image database

This paper presents the basic concepts and principles, data structure and high efficient spatial index for multi-resolution image database. The database is characterized by arrangement of multi-resource image data and seamless mosaic, distribution-based storage and management, integration with other spatial database software such as GeoStar and GeoGrid developed by Wuhan Technical University of Surveying and Mapping.     

A 3-dimensional data model for visualizing cloverleaf junction in a city model

The research work has been seldom done about cloverleaf junction expression in a 3-dimensional city model (3DCM). The main reason is that the cloverleaf junction is often in a complex and enormous construction. Its main body is bestraddle in air, and has aerial intersections between its parts. This complex feature made cloverleaf junction quite different from buildings and terrain, therefore, it is difficult to express this kind of spatial objects in the same way as for buildings and terrain. In this paper, authors analyze spatial characteristics of cloverleaf junction, propose an all-constraint points TIN algorithm to partition cloverleaf junction road surface, and develop a method to visualize cloverleaf junction road, surface using TIN. In order to manage cloverleaf junction data efficiently, the authors also analyzed the mechanism of 3DCM data management, extended BLOB type in relational database, and combined R-tree index to manage 3D spatial data. Based on this extension, an appropriate data structure for cloverleaf junction in 3DCM is proposed.     

Performance optimization of grid aggregation in spatial data warehouses

The problem of storage and querying of large volumes of spatial grids is an issue to solve. In this paper, we propose a method to optimize queries to aggregate raster grids stored in databases. In our approach, we propose to estimate the exact result rather than calculate the exact result. This approach reduces query execution time. One advantage of our method is that it does not require implementing or modifying functionalities of database management systems. Our approach is based on a new data structure and a specific model of SQL queries. Our work is applied here to relational data warehouses.     

山西省1∶10 000地形数据库图库一体化的设计与实现

随着数字测绘时代的开启,作为同一空间要素的不同表达形式,GIS的地形数据和制图数据以各自独立的设计思想和生产技术手段在不同的领域发挥着重要作用,但地形数据与制图数据的分离已不适应多专业领域不同层次综合应用和分析的需求。所以本文根据山西省1∶10 000标准分幅数据现状,基于Arc GISEngine开发了相关程序,并利用1∶10 000制图数据管理工具试生产了一批图库一体化的标准1∶10 000分幅数据。     

基于GTIS的县级农村土地调查数据库建设

针对具体问题紧密联系生产单位实际情况,在分析土地利用数据库建设的基础上,对县级农村土地调查数据库的建设流程进行了分析,以GTIS软件为平台,阐述了一个适用于生产单位的数据库建设方案。     

1∶500基础地理信息数据库更新方法探讨

城市的快速发展给城市面貌带来了日新月异的变化,已建成的基础地理信息数据库需要及时更新,确保数据的现势性,才能满足政府部门及社会公众服务的需求。本文在介绍1∶500基础地理信息数据库快速更新数据源的基础上,重点阐述了1∶500基础地理信息数据的更新方法,提出通过1∶500地形图更新1∶500基础地理信息数据库的方法,并通过实例对更新方法进行了验证。最后论述了建立1∶500基础地理信息数据库更新机制的意义,对反映城市变化及推进共建共享机制具有重要作用。     

地下管网时空信息集成与管理技术创新

提出了建立管网信息普查及信息录入系统,以及完善管网信息关系数据库、综合管网图制作、管网信息空间数据库、三维管网部件模型库等各项工作,通过调用不同数据库的空间信息与属性信息,实现了三维管网模型的快速构建。采用MD5建立了管网模型与属性信息自动关联技术,叠加了原有的地表建（构）筑物模型,引入了统一的时空基准,开发了地上下建（构）筑物管理平台,具有三维模式下现有二维地图无法实现的空间分析等功能,实现了各类三维数据的综合可视化和融合分析,可为城市地下管网管理提供更直观的辅助决策支持。     

GIS地图数据库的研究与实现

将地形图和地质图等进行处理和数字化,然后在GIS平台Arc GIS中建立空间数据库,采用Oracle作为后台数据库,使用空间数据引擎Arc SDE来管理Arc GIS对数据的访问,实现显示、查询、管理和下载等功能。     

闽赣跨断层短水准地点可视化系统设计与实现

针对闽赣地区24个短水准场地现有水准测量数据多而缺乏统一有效管理的问题,提出了建立地图服务发布及数据管理分析一体化系统的方案。在方案设计的基础上,结合Access数据库、ArcGIS Server、Android开发平台、.NET及相关ArcEngine开发平台,构建地图服务发布及数据库管理服务器端、桌面应用端、移动应用端,开发实现了统一式数据管理、地图服务发布、数据分析应用等功能,从而为闽赣地区地震监测提供决策分析支持。     

基于ArcGIS建模的基本农田数据库建库方法探讨

通过图形化建模工具Model Builder对基本农田数据进行建库,是通过构造地理工作流和脚本将数据和空间处理工具连接起来处理的复杂的GIS任务。本文主要对基本农田数据库的建库采用Arc GIS建模的方法进行了探讨。