谈MapInfo下数字实时动态的实现

本文在讨论ＤＤＥ技术的基础上,对ＭａｐＩｎｆｏ、ＶＢ的ＤＤＥ机制的实现作了探讨和分析,并达到处理数据的实时动态。     

MapInfo DDE技术在车载GPS实时导航及监控中的应用

文章介绍了在车载ＧＰＳ实时导航监控系统的应用中,于ＭａｐＩｎｆｏ平台下实时获取ＧＳＰ定位数据的困难。提出利用ＭａｐＩｎｆｏ的ＤＤＥ技术实现同高级语言的动态数据交换,以此来解决这一数据获取问题。文章以ＶＣ＋＋为例给出了ＤＤＥ应用服务程序的设计,及其与ＭａｐＩｎｆｏ的配合。     

VB在DEM生产中的应用

文章介绍了利用ＶＢ与Ａｒｃｉｎｆｏ（ＮＴ）宏命令相结合的技术编制的４ＤＴＬ应用程序,在ＤＥＭ（数字高程模型）生产简化了大量数据计算、录入、格式转换工序,提高了ＤＥＭ生产效率。     

利用DLL在MapInfo二次开发中扩充系统功能

本文通过对基于ＭａｐＩｎｆｏ的应用系统开发时调用ＤＬＬ运行机制的剖析,提出了一种在ＭａｐＩｎｆｏ二次开发中利用ＤＬＬ来扩充系统功能的方法。     

基于沿海业务观测的ＢＤＳ大气可降水量反演

随着中国北斗导航卫星系统新一代ＢＤＳ－３卫星发射,需要对ＢＤＳ反演大气可降水量的精度进行评估。选取 ４个中国沿海ＧＮＳＳ业务观测站,采用精密单点定位方法,设计了ＢＤＳ－２、ＢＤＳ－３和ＢＤＳ－２／３等３种数据处理方案, 开展岸基ＢＤＳ水汽反演试验,并以ＧＰＳ　ＰＷＶ和ＥＣＭＷＦ提供的ＥＲＡ５产品作为参考值,对ＢＤＳ　ＰＷＶ进行精度分 析。结果表明,利用新一代ＢＤＳ－３卫星反演的ＢＤＳ－３ＰＷＶ和ＢＤＳ－２／３ＰＷＶ与ＧＰＳ　ＰＷＶ和ＥＲＡ５ＰＷＶ参考值均 具有很好的一致性,其平均偏差分别为０．６ｍｍ和０．２ｍｍ,均方根误差分别优于１．０ｍｍ和１．６ｍｍ,具有较高的精 度,从而验证了新一代ＢＤＳ－３卫星对ＢＤＳ水汽反演精度提升的贡献;ＢＤＳ－２／３ＰＷＶ的精度略优于ＢＤＳ－３ＰＷＶ,在 一定程度上验证了ＢＤＳ混合星座对水汽反演精度的影响。     

标注（注记）从ArcView到MapInfo的转换

针对数据从ＡｒｃＶｉｅｗ到ＭａｐＩｎｆｏ转换过程中的标注（注记）丢失问题,分析了ＡｒｃＶｉｅｗ和ＭａｐＩｎｆｏ的有关数据格式,指出了从ＡｒｃＶｉｅｗ到ＭａｐＩｎｆｏ的一般转换方法,特别分析了标注在ａｐｒ和ｍｉｆ中的格式,最后给出了转换过程的Ｃ语言描述。     

基于MapInfo的城市3维可视化GIS

介绍了在以ＶｉｓｕａｌＣ＾＋＋５．０ｆｏｒ ｉｎｄｏｗｓ ９５／ＮＴ及图形库ＯｐｅｎＧＬ开发的城市景观３维可视化系统（ＶＣＭ＆Ｖ）发过程中,以对象链结和嵌入（ＯＬＥ）技术在可视化界面上实现了ＧＩＳ软件ＭａｐＩｎｆｏ的交互查询功能,大大增强了城市ＧＩＳ的３维可视化功能。     

应用核驱动BRDF模型与AVHRR数据监测撒哈拉土壤表面动态变化(英文)

将要用来处理来自即将开始运行的ＥＯＳＭＯＤＩＳ和ＭＩＳＲ仪器的ＢＲＤＦ／反照率乘积的反照率反演程序包中的ＢＲＤＦ模型在该文中被用来对来自ＡＶＨＲＲ数据的ＳＡＨＥＬ地区的方向反射数据进行建模。模型被证明能够很好地描述观测到的数据。同时也讨论了核的选择和导出模型的参数所含的信息内容等问题。     

用VirtuoZo数字摄影测量工作站生产DEM、DOM的试验

利用数字摄影测量工作站手段生产数字高程模型ＤＥＭ,数字正射影像图ＤＯＭ是一项全新的技术。针对ＶｉｒｔｕｏＺｏ的特点,为顺利开展批量生产,对影像扫描参数的设定,影像自动匹配窗口大小的设定,ＤＥＭ编辑技巧和ＤＥＭ精度检核这些关键技术的讨论很有必要,本文拟就这些影响生产效率、成图质量的主要因素进行找对实际应用进行总结。     

关于DEM的高程,坡度,坡向精度评估

本文在南部Ａｐｐａｌａｃｈｉａｎ山区的Ｂｌａｃｋｓｕｂｕｒｙ，Ｖｉｒｇｉｎｉａ中心地区的两个ＤＥＭ上评估了高程、坡度、坡向的精度。     

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.     

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.     

GIS空间数据的采集误差及其分析

本文详细阐述了GIS数据采集过程中的误差来源，重点分析了通过地图、遥感和摄影测量等方式采集数据所产生的误差及其特性，分析了其对GIS数据的影响与消减方法。     

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。