THE ESTABLISHMENT OF A MICRO--COMPUTER BASED GEOGRAPHIC INFORMATION SYSTEM

In this paper,authors introduce the establishment of a Micro-computer Based Geographic Information System(MCGIS),which is one of the subsystems of The Loess Plateau Geographic Information System (LP-GIS) being carried out by the REIS Laboratory and several universities of China on various types and levels of computer.MCGIS is developed on the micro-computer Gteat Wall-286.Its purpose is to providean information system with powerful perforrmance,which could be afforded by thosecounty-level units or departments,so that the general guide-line of multi-function,multi-level and multi-user can come to practice. The system MCGIS is composed of the spatial database management systems and some software packages for geographic analysis and other further data processing.The spatial database management svstem is the kernel part of the MCGIS,and other function packages are babed on it.The whole system remains open, i.e.,ready to be extende in function.     

GEOSPATIAL INFORMATION

Data Extraction Technology of Land Cover Element in Geographic Conditions Census Based on FME by YU Yongsheng Abstract In this paper, the problems and deficiencies of land cover classification based on vector and raster overlay were analyzed under the Wuhan geographic conditions census project. The thematic elements extraction and processing technology for large scale topographic map data were proposed. The results show that this method can improve the efficiency and quality of land cover classification interprets, and show certain significance for carrying out the geographic conditions census. Key words geographic con ditions census, land cover classification, FME, data extraction （Page： 1 ）     

大型土木工程结构的动态位移远距离实时监测系统(英文)

Based on digital image processing technique, a real-time system is developed to monitor and detect the dynamic displacement of engineering structures. By processing pictures with a self-programmed software, the real-time coordinate of an object in a certain coordinate system can be obtained, and further dynamic displacement data and curve of the object can also be achieved. That is, automatic gathering and real-time processing of data can be carried out by this system simultaneously. For this system, first, an untouched monitoring technique is adopted, which can monitor or detect objects several to hundreds of meters apart; second, it has flexible installation condition and good monitoring precision of sub-millimeter degree; third, it is fit for dynamic, quasi-dynamic and static monitoring of large engineering structures. Through several tests and applications in large bridges, good reliability and dominance of the system is proved.     

Integration and Sharing of Geo-spatial Data Based on Data Engine

Through analyzing the principle of data sharing in the database system, this paper discusses the principle and method for integrating and sharing GIS data by data engine, introduces a way to achieve the high integration and sharing of GIS data on the basis of VCT in VC , and provides the method for uniting VCT into RDBMS in order to implement a spatial database with object-oriented data model.     

Transformation method of exterior orientation angular elements obtained via position and orientation system under Gauss-Kruger projection coordinate system

Data obtained via airborne position and orientation system (POS) is in WGS 84 global geocentric reference frame, while the national coordinate reference system for topographic mapping in China is generally Gauss-Kruger projection coordinate system. Therefore, data obtained via a POS must be transformed to national coordinate system. Owing to the effects of earth curvature and meridian deviation, there are some errors in the process of angle transformation from roll, pitch, and heading (Φ ,Θ ,Ψ )obtained dir...     

GEOSPATIAL INFORMATION

Design of the Hierarchical Index System for National Geographic Condition Statistics by LIU Yaolin Abstract A hierarchical index system for national geographic condition statistics was proposed by using the national geographic condition survey database as the main data source, where three types of statistics, fundamental statistics, categorical statistics and comprehensive statistics, were worked out. Following that, the methodologies of geographic condition statistics were discussed, which was essential for implementing the project of national geographic condition monitoring.     

DESIGN AND REALIZATION OF MAP DIGITIZATION SYSTEM ON MICRO-COMPUTER BASED MAP GRAPHIC WORKSTATION

The main purpose to develop a Map Graphic Workstation on thewidely used micro-computer is that by it the whole processing of map data fromcapturing,managing,editing,updating to graphic outputting can be realized.Map Digitization System（MDS）is the software system to deal with the initial andalso the most important processing.In this paper,the authors introduce a MDSon a micro-computer based Map Grphic Workstation that has been qualitified forthe producation of digital map.Since the system is designed totally independentlyand in the general frame of the Map Graphic Workstation,the capturing and man-aging and other processings for map data are in an integral manner,in which theproducation of digital map can be fulfilled conveniently.At the same time,thesystem is flexible for function extension and widely applicable to the data from dif-ferent sources and with different information characterisitcs(e.g.,the processingof Chinese characters on map).     

Practical Research of IKONOS-2 Geopositioning and Its Accuracy in Tibet of China

This paper presents the studies of the refining of IKONOS-2 RPC, the transform of the datum, the mode of the control point distribution and the method of IKONOS stereo triangulation, so that IKONOS imagery can be used to collect the precise geospatial data and produce the large scale map. The transform between the IKONOS-2 image space and the national coordinate system based on the RPC have been developed, and the results of block adjustment with various control schemes in a practical project near Himalayas have been examined and analysed. The encouraging results of high positioning accuracy have been obtained.     

The integrated spatial databases of GeoStar

GeoStar is the registered trademark of GIS software made by WTUSM in China.By means of the GeoStar,multi-scale images,DEMs,graphics and attributes integrated in very large seamless databases can be created,and the multi-dimensional dynamic visualization and information extraction are also available.This paper describes the fundamental characteristics of such huge integrated databases,for instance,the data models,database structures and the spatial index strategies.At last,the typical applications of GeoStar for a few pilot projects like the Shanghai CyberCity and the Guangdong provincial spatial data infrastructure (SDI) are illustrated and several concluding remarks are stressed.     

数据库驱动的地形图快速制图技术探讨

结合1：50000基础地理信息数据库地形图制图数据快速生产的迫切需要,在分析当前地形图制图生产技术现状的基础上,研究探讨了基于数据库驱动的地形图快速生产技术,设计了适合测绘行业生产现状的工艺流程,研制开发了实用化的生产软件系统,并实现了在国家1：50000数据库更新工程中的规模化应用。     

1：50000数据库更新工程元数据设计与建库

介绍了国家1：50000数据库更新工程元数据库设计方案和建库方法。在分析1：50000数据库更新成果元数据基础上,从应用需求出发。面向“符合标准、满足应用、适于共享”的元数据建库口标．采用XML技术归纳设计3种元数据应刚模式和内容规范,制定元数据建库方法与流程,建设1：50000数据库更新工程元数据库。在此基础上建没完成面向管理应用的牲于内网C／S结构的元数据管理系统,面向分发业务应用的基于内网B／S结构的浏览查询系统,而向共享服务的基于互联网的元数据服务系统,方便符类刚户存不同场景查询使用1：50000数据库更新工程成果。     

面向1∶1000000地形数据库的缩编方法研究与程序开发

目前国家启动了1∶1000000基础地理信息数据库动态更新项目,其中1∶1000000地形数据库主要是利用最新版的1∶250000地形数据进行缩编更新生产。本文主要依据1∶1000000地形数据库缩编更新相关的项目要求和技术指标,研究和制定对应的地形数据缩编方法。并在人机交互作业的前提下,利用ArcGIS桌面软件和ArcObjects组件,开发一系列缩编工具,将地图综合过程分解,合理地进行人机分工,交互式地完成地图缩编工作。     

多尺度基础地理数据联动更新技术

随着国家基础地理信息数据库动态更新工程的启动,社会发展对于基础地理信息数据的现势性要求日益提高。传统的多尺度基础地理信息数据分别更新生产的方法效率低下,本文提出了一种基于要素的数据联动更新技术,以要素为中心对多种尺度的基础地理信息数据联动更新生产;并介绍了整合更新数据库、要素更新规则定义、要素匹配与联动更新等主体技术方法;最后设计联动更新程序,验证了该技术的可行性和高效性。     

国家基础地理信息数据库动态更新总体技术

保持基础地理信息的现势性是我国基础测绘工作的重要使命。为此,国家测绘地理信息局于2012年启动了国家基础地理信息数据库动态更新工程,对我国1∶5万、1∶25万、1∶100万基础地理信息数据库进行持续快速更新,每年更新一次、发布一版。本文介绍了动态更新的总体技术思路,阐述了基础数据库动态更新、派生数据库联动更新、多时态数据库管理服务等主体技术方法,并介绍了主要技术特点和工程应用效果。     

国家新版1：50000地形图制图技术设计与实践

国家新版1：50 000地形图制图工程是国家1：50 000数据库更新工程主要任务的有效延伸和重要补充,它基于最新的1：50 000地形数据库,采用数据库驱动制图技术,实现了地形图制图数据的快速生产与建库。本文在对现状和需求分析的基础上,重点介绍开展制图工程的技术方法、工艺流程、成果特点等内容。     

基于地形图数据库的跨比例尺级别缩编更新方法研究

针对利用1：500地形图快速更新其他比例尺地形图的需求,本文提出了基于地形图数据库的同比例尺级别和跨比例尺级别全自动缩编更新入库的方法。通过设计地形图模板及过渡模板,定义地物要素综合取舍转换规则,开发自动缩编软件模块,定制自动缩编更新任务,利用数据库中测量更新范围线自动下载地形图数据进行缩编及更新入库,实现大比例尺地形图依次缩编更新获取多种比例尺地形图的目标。本文提出的技术方法已在长沙市城市基础地理信息数据库更新工作中得到了验证,为采用缩编方式快速获取多样性地理信息数据提供了技术经验。     

地理国情与基础地理信息数据同步更新外业调绘系统的构建

利用全新的外业数据调绘理念,在地图数据缓存切片技术、GPS定位技术及手持移动终端等技术设备基础上构建了地理国情与基础地理信息数据同步更新外业调绘系统,实现野外作业时,同一地物要素只需补测一次即可完成地理国情与基础地理信息数据的外业调绘工作,避免了重复外业采集生产,有利于降低地理国情与基础地理信息数据的更新成本。     

省级地理信息动态更新技术体系研究

目前,测绘地理信息生产方式还是以传统的大规模、周期性、全要素生产为主,缺少覆盖更新数据采集、处理入库、提取分发、配图切片、发布全过程的数据标准、生产协调机制、工艺流程和支撑软件系统。本文从重要地理信息要素标准、地理信息变化发现、更新生产调度、外业要素采集、数据库更新与发布等地理信息更新全流程进行研究,提出了1∶1万基础地理信息数据及天地图数据动态更新工艺流程和生产组织模式,形成省级地理信息动态更新技术体系。     

重庆城市空间数据更新与建库

本文介绍了重庆城市空间数据生产管理现状、数据更新保障机制,着重介绍了综合运用全野外数据采集、规划管理成果、航空摄影测量、卫星遥感影像、缩编等手段更新系列比例尺空间数据的技术方法;针对院空间数据生产库(制图库)与应用库(GIS库)衔接不紧密的现状,提出了生产库与应用库双库存储模式解决方案,既解决了复杂生产数据的数据库管理问题,又满足即时向政府部门及社会提供地理信息服务。