基于无人飞行器遥感影像的数字摄影测量关键技术研究

随着无人飞行遥感器越来越多的应用到国民经济建设,无人飞行器遥感影像的处理已成为当下一个热点的研究问题。但相对于传统的航空摄影测量而言,无人飞行器遥感影像有着很多传统航空影像所不具有的问题。针对这些特点,本文着重探讨影像畸变改正、Harris特征点提取、基于特征点的金子塔影像双向匹配以及核线影像生成等无人机影像数字摄影测量处理的关键技术。     

数字航空影像辐射信息精处理问题的探讨

在分析数字航空影像辐射信息的基础上,针对数字航空像片的特点,探讨对数字航空影像进行匀光和匀色处理的技术方法,以及实现批量化处理的方法研究。     

高分辨率影像数据处理及数据建库技术方法研究

通过开展高分辨率卫星遥感影像数据(SPOT5)处理及建库技术方法研究和探索,制定了"高分辨率影像数据处理及基于遥感影像土地利用数据库建设技术要求"和"省级基于遥感影像1:1万土地利用数据库标准",制作了覆盖河南拿省的1:1万数字正射影像图,建立了河南省基于SPOT5的GPS像控点图形图像数据库、高分辨率卫星影像数据库和基于影像信息土地利用数据库,为全国土地利用二次调查基础底图制作进行有益的探索.     

数字环境下影像图集出版技术模式与实践

以《苏州市影像图集》的编辑出版为例,探讨在数字环境下影像图集出版的新技术模式,主要阐述影像图集设计原则、出版技术方案、数字资料与模拟资料的数据融合、矢量数据采集及符号化规则、数字印前处理技术方法等。分析影像图集制作的关键技术以及如何利用技术手段进行质量控制,同时对生产中所遇到的问题给出解决方案。     

黄河遥感影像数据管理和共享系统

一、引言 黄河遥感影像数据管理和共享系统足"数字黄河"工程基础设施的重要组成部分,该系统的开发建设将使遥感技术在黄河治理开发过程中发挥重要作用.有关防汛、水调、水资源保护等业务对遥感数据的实时性要求比较高,为满足这些业务的要求,在"数字黄河"工程中,规划建设遥感影像数据管理和共享系统,重复利用黄河水利委员会(以下简称黄委会)现有海量影像资源,实现对有关遥感数据资源的统一处理和管理,避免资料的重复购买及项目的重复建设.     

数字正射影像拼接的研究

介绍了数字正射影像,详细探讨了数字正射影像的拼接,并介绍了一种处理影像重叠区域过渡的方法,以消除拼接后影像的接缝。     

数字地质编录中坡面展示影像图的制作研究

基于影像的数字地质编录是摄影测量和工程地质学科边缘交叉发展的技术成果之一．目前仍处于研究阶段。介绍了影像数字地质编录中坡面展示影像图的制作原理及其流程，重点阐述了畸变校正后像片坡面影像几何纠正的两种不同的处理方法。实践表明，两种处理方法的结合能够很好地满足数字地质编录中对展示影像图的生成及使用的要求。     

基于INPHO在建库影像匀光匀色中的应用

在测绘生产的影像处理中,我们都会遇到影像存在有颜色、明暗、反差等过渡不均的问题,如何对影像进行快速的数字匀光、匀色处理,以达到改善影像质量、提高生产效率的目的,一直是大家研究探索的方向之一。通过建库项目的生产经验,介绍了利用INPHO软件对基础地理信息数据库建设项目中的影像进行匀光匀色处理的方法,并简要介绍了运用INPHO软件处理其它影像的技术手段。     

利用PixelGrid系统处理多源遥感影像方法研究

随着科学技术的快速发展,人们对于高性能计算技术的需求日益迫切,大规模数据并行处理的集群式系统实现技术开始逐步成熟。我国已对该项技术进行了深入研究,并将其应用到遥感影像处理技术当中,形成了集群式数字摄影测量系统Pixel Grid。相对于传统的摄影测量及遥感影像处理过程,集群式系统整合资源、集成技术,大大提高了数字摄影测量以及遥感影像数据处理乃至空间信息提取的处理效率。这也是目前遥感影像处理技术发展的重要方向之一。     

基于像素工厂处理不同影像数据源制作DOM的研究

简要介绍了像素工厂影像处理系统,通过卫星影像、ADS80影像、DMC框幅式影像3种数据源的处理,分析3种数据源处理过程中生产DOM(数字正射影像)各个环节的流程,以及在处理过程中与Arc GIS和Terrasolid等软件的配合使用。     

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。