基于GEOWAY CIPS大比例尺正射影像快速生产的方法研究

面对经济社会发展急需大量影像数据支撑的现状,本文提出了基于GEOWAY CIPS大比例尺正射影像快速生产的方法,分析了基于GEOWAY CIPS影像处理的关键技术流程,总结了该生产流程的优势与不足,并通过实际项目,验证了本文生产方法的高效性与可靠性。     

PCI GXL 在国情普查项目中的应用

结合第一次全国地理国情普查数字正射影像底图生产项目,介绍了PCI GXL系统自动化批量处理稀少控制区域的高分辨率卫星影像的生产技术流程和关键技术环节,通过在实际生产中的应用和对成果的精度评鉴,进一步验证了基于PCI GXL系统自动、快速生产高分辨率卫星数字正射影像的方法是完全可行的。     

PCI GXL在国情普查项目中的应用

结合第一次全国地理国情普查数字正射影像底图生产项目,介绍了PCI GXL系统自动化批量处理稀少控制区域的高分辨率卫星影像的生产技术流程和关键技术环节,通过在实际生产中的应用和对成果的精度评鉴,进一步验证了基于PCI GXL系统自动、快速生产高分辨率卫星数字正射影像的方法是完全可行的。     

基于GEOWAY CIPS的DOM制作研究及效率对比分析

基于GEOWAY CIPS集群式影像处理系统,研究大规模遥感影像快速、批量、智能化生产的关键技术流程,通过实际项目探讨了集群快速处理海量数据的实现性并与传统处理方式对比,总结CIPS下DOM制作方法的优劣性。     

面向地理国情的正射影像集群生产模式探讨

以地理国情正射影像生产为例,探讨Geoway CIPS、PCI GXL集群系统协同作业的生产模式。结合两个集群系统优势对地理国情正射影像生产流程进行优化,实现集群生产系统的协同作业,进一步提高正射影像的生产效率。同时辅以整景正射影像和分幅正射影像成果的整体有效性检查和成果目录组织等工具,保证正射影像成果满足地理国情监测项目的要求。     

利用集群技术实现卫星影像快速生产数字正射影像

数字正射影像数据是地理国情普查中主要的调查数据源,同时也是普查成果数据的重要组成部分。本文对卫星影像数据快速生产数字正射影像进行了研究,通过充分利用国家基础测绘项目中最新的1：10 000 DEM、DOM成果数据,结合PixelGrid集群匹配点的强大功能,Geoway CIPS1.0集群一体化流程中途无需人工干预的各自优势,主要使用PixelGrid集群来实现整景数字正射影像的生产,Geoway CIPS1.0集群来实现1：25 000分幅数字正射影像的生产。研究结果表明,生产出的数字正射影像达到了地理国情普查项目对数字正射影像成果的要求,相比传统的数字正射影像生产方法节约了大量的人力、物力,大幅提高了生产效率。     

基于GXL的“天绘一号”卫星影像数据处理

GXL凭借其在海量影像处理上的优势,在数字正射影像的生产中起到了重要的作用。本文简要介绍了GXL的构架及其优点,详细介绍了利用GXL处理"天绘一号"影像的过程,最后对GXL的生产效率进行了分析,证实了GXL在处理海量影像上的优势。     

利用PCI GXL-A进行航空影像DEM匹配及编辑

随着航空摄影测量技术的快速发展,海量正射影像数据生产已经成为测绘生产的常态.而正射影像的生产离不开数字高程模型(Digital Elevation Model,DEM)数据,因此快速高效的生产DEM对正射影像的生产至关重要.本文以航空影像作为实验数据,利用影像处理软件的航空影像处理模块2018年版本(GXL 2018 SP3 Aerial)空三加密后进行高精度数字地表模型匹配,并使用软件中数字高程模型的编辑(Geomatic Focus的DEM Editing)功能对数字地面模型(Digital Terrain Models,DTM)进行快速编辑生成DEM数据,为今后大批量DEM生产及编辑工作提供借鉴.     

卫星影像无控制点正射纠正在地理国情普查中的应用研究

结合青海省第一次地理国情普查数字正射影像生产过程,阐述数字正射影像无控制点正射纠正生产工艺流程和质量控制方法,探讨基于GXL软件平台、基于有理函数模型的卫星影像数据无控制点正射纠正处理与数字正射影像质量控制关键技术.     

湖北省第三次国土调查正射影像制作方法探讨

结合湖北省点军区第三次国土调查(以下简称三调)正射影像的生产实践,介绍了湖北省点军区概况和基础资料情况;分别利用Easy-Sat和PCI GXL对三调遥感影像进行正射影像制作,并分析了两种正射影像制作方法的特点和差异性,提出了更适合湖北省三调正射影像制作的方法。     

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.     

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。     

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.     

自动车辆定位导航系统中传感器的误差分析

对国界定位导航系统中几种常见的辅助传感器所产生的误差进行了分析，导出了不同传感器的误差模型。这些误差模型是估计车辆位置的扩展卡尔曼滤波器的基础，同时也为选择适当的传感器提供了理论根据。