时滞区间大系统鲁棒稳定性分析的遗传算法实现

研究了时滞区间大系统的鲁棒稳定性分析问题 ,给出了相应的理论结果。并应用遗传算法 ,给出了相应的实现算法和数值仿真结果     

城市典型房屋屋顶构网及可视化研究

介绍了房屋屋顶构网及其三维显示的方法,给出了具体的数据结构及相应的算法流程以及房屋屋顶构网的三维显示结果.     

Landsat卫星WRS网格坐标位置估算方法的研究

全球参考系(WRS)是为卫星下行数据服务而建立的一种全球符号坐标系统,本文详细介绍了Landsat卫星的轨道特性,给出了相应的WRS网格坐标位置的估算方法,并给出了估算的结果。对该方法的研究为地面应用系统卫星数据的管理提供了参考。     

秦岭隧道群GPS控制网的布设和精度设计

从隧道贯通误差的限值出发,计算GPS隧道网坑口控制点的必要精度,对隧道群GPS网的布设、精度设计和质量控制等问题进行讨论并给出相应的结果,对隧道洞内控制测量给出有效的建议,可供实际参考。     

基于真三维TIN的三维激光扫描数据压缩方法

提出了基于真三维TIN的数据压缩思路，根据最大夹角与阈值之间的关系决定点的取舍，给出了相应的压缩算法，对于变化平缓的表面有很好的压缩效果。并以同济大学的孔子头像为例，给出了具体的实现方法，同时对数据压缩结果的质量采用多种方法进行了评价，以验证方法的可行性。     

利用Landsat TM图像更新地形图

采用多项式纠正和直接线性变换两种数学模型 ,对TM图像进行几何纠正 ,获得的正射影像与地形图矢量数据配准。在Microstation 95系统下 ,进行地形图矢量数据的更新 ,并给出了相应的实验结果     

基于轨道参数的ERS—1／2数据基线估计与平地效应消除

基线估计与平地效应的消除在INSAR数据处理中有着重要的地位和作用。本文详细介绍了利用轨道参数对ERS—1／2数据进行基线估计与平地效应消除的方法，并给出了相应的实验结果。     

利用Landsat TM图像更新地形图

采用多项式纠正和直接线性变换两种数学模型,对TM图像进行几何纠正,获得的正射影像与地形图矢量数据配准.在Microstation 95系统下,进行地形图矢量数据的更新,并给出了相应的实验结果.     

“多对多”模式GPS台站网系统设计与应用分析

本文在分析GPS RTK定位工作模式的基础上,以苏州市为研究对象,讨论了＂多对多＂模式GPS台站网系统设计,研究了相应的操作规程,并进行了该模式下的定位试验,对定位结果的精度进行了分析,最后给出了结论。     

两种VRS伪距观测值模拟方法的比较

VRS技术是目前应用较为广泛的一种网络RTK技术,克服了常规RTK受距离影响较大的缺点,具有覆盖面广、精度高等优点。本文分别采用两种方法对VRS技术的伪距观测值进行了模拟和对比分析,给出了相应的算法和模拟结果。     

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。     

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.     

使用FME与VBA提取机场方格网高程数据

因受机场工程设计软件的测量数据容量限制,基于LiDAR采集、点云分类后得到的地面点云数据LAS不能完整应用于目前设计软件进行设计计算。本文通过对拟选技术方案的筛选,提出了利用FME Workbench数据处理功能,结合VBA编程获取外部方格网平面数据的方法。该方法在FME Workbench中实现了地面点云数据构建TIN、采用逐点内插方法从TIN中提取方格网高程数据、等高线生成及相应图形处理与成果输出。最终通过实际算例证明了该方法的有效性。     

“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。