国土房产信息资源目录服务系统研究与实现

在国土资源和房产管理局的信息化过程中,缺乏一个有效的系统来管理、使用这些庞大而分散的国土资源,这就需要建立国土资源目录服务系统。本文探讨了国土信息资源目录系统的功能、元数据框架,并实现了深圳市国土资源与房产信息资源目录,此系统提高了查询资源的效率、实现了跨部门和跨应用系统的信息资源的共享。     

浅谈地理国情普查数据生产元数据制作

地理国情普查是为了获取我国陆地国土范围内的地表和人文地理要素而进行的一项国情国力的调查。而专门针对第一次全国地理国情普查的数据生产元数据既便于元数据信息的采集和应用,更易于发挥元数据的实际作用。本文就如何制作地理国情普查数据生产元数据进行了简单的探讨。     

国土资源信息核心元数据的研究

国土资源信息核心元数据是建立运行在国土资源数据交换网络上的国土资源信息目录的基础和重要组成部分，也是目前数字国土工程中实现国土资源数据共享的重要途径。分析了国内外地理信息元数据标准的发展状况，根据国土资源信息核心元数据确定的原则和描述要求，确定了国土资源信息核心元数据的主要内容，提出了以通用建模语言UML类图作为国土资源信息核心元数据的结构设计，用数据字典详细定义核心元数据的组成，以构成国土资源信息核心元数据的完整描述的设计方法。     

“一张图”地理资源元数据初探

地理资源是建设"一张图"的基础,元数据是资源与用户之间重要的桥梁。本文介绍了地理资源元数据的概念、标准和作用,结合对一张图系统的需求情况,初步设计了元数据的内容,并强调了空间元数据的一些关键要求。     

元数据和数据集一体化管理模型及应用研究

元数据和数据集是紧密联系的，基于元数据和数据集的一体化管理模型的3层体系结构，解决了元数据和数据独立管理的问题，并从数据集对象的建立、数据集对象的查询和获取、数据集对象的变更3个方面阐述了该管理模型的实现流程。最后在中山市国土房管局综合信息建设中，基于该模型和运用元数据和数据集一体化管理系统IIMS进行了应用研究。     

WebGIS中的元素据与基于元数据的信息查询

详细论述了地理信息元数据的概念与作用，在此基础上提出了一种地理信息元数据的设计和组织方案，为其设计了管理系统，最后提出了基于元数据的查询方案。     

电子政务多数据中心地理空间元数据共享服务

通过对地理空间信息元数据标准的研究,分析了元数据的表达形式与存储策略,构建了多数据中心地理空间元数据共享服务系统,实现了分布式信息资源元数据共享交换和数据下载预览服务。     

WDC中国地质科学数据网的核心元数据

科学数据共享平台建设的重要内容之一是核心元数据,这是提供科学数据服务必不可少的数据资源。本文从实际应用角度简要介绍了WDC中国地质科学数据网的核心元数据内容及主要元数据元素,旨在对正在建设的各类科学数据共享有所借鉴和参考。     

基于UML的房产信息系统的设计

随着城市规模的不断扩大,房产管理部门对日益更新和迅速增加的房产信息的管理与维护越来越困难,房产信息系统是一个复杂的系统,而现有的房产信息系统对空间数据与属性数据没有很好集成,不利于图文信息的相互查询、检索和更新等.针对目前存在问题,在房产信息系统设计时,结合统一建模语言(UML,Unified Modeling Language),进行可视化设计.     

基于CSW的全球地表覆盖信息共享

元数据是信息共享的重要技术之一,地表覆盖信息具有类型多样、处理复杂、变化较快等特点,目前还没有相应的元数据标准规范对其进行描述。本文分析了地表覆盖信息的特征,以此为基础,扩展现有的地理信息元数据标准,构建了全球地表覆盖信息元数据模型;并结合OGC的CSW规范提出了全球地表覆盖元数据目录服务共享方案;最后实现了全球地表覆盖信息元数据目录原型系统,提供了用户发现、发布和管理元数据的功能,促进了全球地表覆盖信息的共享。     

阿克苏河-塔里木河水系水质污染遥感监测与评价

 采用Landsat TM数据分析了阿克苏河—塔里木河断面水质污染状况,通过波段的DN值和常规监测数据建立能反映水质状况的 污染物监测模型。结果发现,将2000年常规监测数据代入模型后,与遥感数据的结果基本吻合| 重建阿克苏河—塔里木河的连续水体 污染变化曲线,得出污染物浓度随着远离上游而增加。     

Monitoring drought dynamics in the Aravalli region (India) using different indices based on ground and remote sensing data

The hard-rock hilly Aravalli terrain of Rajasthan province of India suffers with frequent drought due to poor and delayed monsoon, abnormally high summer-temperature and insufficient water resources. In the present study, detailed analysis of meteorological and hydrological data of the Aravalli region has been carried out for the years 1984–2003. Standardised Precipitation Index (SPI) has been used to quantify the precipitation deficit. Standardised Water-Level Index (SWI) has been developed to assess ground-water recharge-deficit. Vegetative drought indices like Vegetation Condition Index (VCI) and Temperature Condition Index (TCI) and Vegetation Health Index (VHI) have been computed using NDVI values obtained from Global Vegetation Index (GVI) and thermal channel data of NOAA AVHRR satellite. Detailed analyses of spatial and temporal drought dynamics during monsoon and non-monsoon seasons have been carried out through drought index maps generated in Geographic Information Systems (GIS) environment. Analysis and interpretation of these maps reveal that negative SPI anomalies not always correspond to drought. In the Aravalli region, aquifer-stress shifts its position time to time, and in certain pockets it is more frequent. In comparison to hydrological stress, vegetative stress in the Aravalli region is found to be slower to begin but quicker to withdraw.     

Landslide risk analysis between Giri and Tons Rivers in Himachal Himalaya (India)

The area around Sataun in the Sirmur district of Himachal Pradesh, India (falling between the rivers Giri and Tons; both tributaries of the Yamuna River) was studied for landslide vulnerability on behalf of the inhabitants. The study was made using extensive remote sensing data (satellite and airborne). It is well supported by field evidence, demographic and infrastructural details and aided by Geographic Information System (GIS) based techniques. Field observations testify that slope, aspect, geology, tectonic planes, drainage, and land use all influence landslides in the region. These parameters were taken into consideration using the statistical approach of landslide hazard zonation. Using the census data of 1991, vulnerability of the populace to the landslide hazard was accessed. As most of the infrastructure in the region is concentrated around population centres, population data alone was used for vulnerability studies.     

Gravity Changes Before Large Earthquakes in China: 1998-2005

Although it is well known that coseismic gravity changes take place during an earthquake, previous research has not yielded convincing evidence demonstrating that significant gravity changes occur before large earthquakes. Furthermore, even if we suspect that gravity changes occur before large earthquakes, we have yet to demonstrate how to consistently observe these changes for useful earthquake forecast that would bring benefits to society. We analyzed ground gravity survey data obtained in 1998, 2000, 200...     

GNSS系统及其技术的发展研究

阐述了国际上卫星导航系统的总体发展,对美、俄、欧、中的四大全球系统,以及相关的区域系统和增强系统进行了简单的介绍,研究分析了GNSS系统及其技术的发展趋势,同时分析了我国Compass全球系统面临的机遇和挑战,并提出了我国未来工作的建议.     

“4D”技术及其应用

介绍“４Ｄ”（即数字地面模型、数字正射影像、数字栅格地图和数字线划地图）系列产品的生产流程、关键技术、及其在耕地保护、防灾减灾救灾和城市规划等方面的应用方法。     

Virtual Australia: its key elements – know,think, communicate

Abstract

Virtual Australia is not a well-defined or agreed concept. This discussion paper conceptualises Virtual Australia as a ‘virtual [digital] model containing and representing all non-trivial objects and their contextual environment – from blue sky to bedrock – in real world Australia’. It describes a scenario for Virtual Australia, one or two decades from now, in which the locations and conditions of non-trivial objects and their environment are updated automatically through a combination of remote sensing and wireless communication technologies in support of a ‘Supranet’. It then examines the concept of the ‘Supranet’ – a pervasive information network based largely on wireless technology linking the physical world to a virtual model in real time – and develops and discusses three principal characteristics of the Supranet: the ability to have or collect specific information (know); the ability to process information (think); and the ability to communicate that information. If, in the near future, any or all non-trivial devices are to some extent able to know, think and communicate, the potential for object autonomy will be realised.     

地理数据库的关系模型及其实现

本文从以图论观点分析地理实体入手,系统阐述了地理数据库关系模型的设计法和过程。作者于1984年4～9月间在微型机上设计建立了关系型地理数据库的实方验系统(RGDB)。该系统采用了本文提出的关系模型,采用了可动态扩库的子库组合结构,这种结构具有灵活性和提高空间利用率的优点。RGDB含有多种功能的数据操作命令,除了具有一般检索功能外,还能进行“开窗”选取和十分“自由”的映象选取。本文对RGDB系统的主要性能和实现途径作了扼要介绍。     

Toward seamless indoor-outdoor applications: Developing stakeholder-oriented location-based services

Location-Based Services (LBS),an emerging new business based on smartphone and mobile networks,are becoming more and more popular.Most of these LBSs,however,only offer non-seamless indoor/outdoor applications and simple applications without giving stakeholders the chance to play an active role.Our specific aim is to solve these issues.This paper presents concepts to solve these issues by expanding the Open Location Services Interface Standard (OpenLS) to allow seamless indoor/outdoor positioning and to extend the content of the services to include information recommended by stakeholders.     

基于WebGL的三维智慧管网系统的设计与实现

随着城市面貌日新月异,地下管网的建设也在持续推进,作为城市的地下“神经网络”,全天24 h保障城市的正常运转和发展。本文以实现城市管网管理系统的高可用、无插件、智能化为目标,采用“地上地下一体”“二三维一体”的设计理念,研究基于WebGL的三维智慧管网系统的关键技术,实现了管线设施管理的信息数字化、空间化与图形化。