无人机航摄系统在大比例尺成图中的应用

无人机航摄系统是以无人机为飞行平台,以影像传感器为任务设备的航空遥感影像获取系统。通过介绍无人机航摄系统的应用实例,阐述了其在大比例尺地形图测绘中的应用。     

无人机低空摄影测量在矿山治理中的应用研究

从无人机低空航摄系统角度入手,对无人机系统的组成及作业流程作了简单介绍,并通过实验验证无人机低空航摄系统测绘山区地形图的优势,分析了低空无人机航摄技术在矿山资源、环境监管等方面应用的优势。总结无人机低空航摄技术在矿山环境监测及恢复治理的可行性和实效性,无人机航测技术以其分辨率高、监测方式灵活机动等优势,可降低传统矿山监测手段对地形环境的要求,从而提升矿山资源开采监测的效率和水平。     

无人机航摄影像用于土地整治项目核查的探讨

介绍了无人机航摄影像在土地整治项目中的应用,详细阐述了无人航摄系统用于土地整治项目核查所涉及的主要技术及工作流程,分析了无人机航摄影像在土地整治项目核查验收应用中的优劣势。     

基于固定翼无人机航摄影像获取及应用探讨

无人机航摄系统作为传统航空摄影测量手段的有力补充,在小区域大比例尺地形测绘领域发挥了积极有效的作用。文章主要对固定翼无人机航线设计和航摄影像获取过程进行了阐述,探讨了无人机获取高分辨率图像与常规航摄的区别以及其应用的领域。     

基于中型固定翼无人机航摄系统的大比例尺测图精度评估探讨

针对低空无人机航摄系统工作效能与测量精度方面的问题,笔者所在团队研发了一套无人机航摄系统,在新疆和田某荒漠区开展了航摄试验,对无人机航摄系统获取的航摄影像平面精度及测高精度进行评估,结果表明:成像结果可以满足1∶1 000地形图测图的平面精度要求。     

我国无人机航摄系统现状和前景

通过对我国固定翼轻型无人机航摄系统的制造背景、技术现状和系统组成的介绍,阐述了无人机遥感的独特优势,分析了我国无人机航摄系统推广初期存在的一些需要解决的问题;并展望了无人机航摄系统在我国的发展前景。     

无人机航摄质量控制与分析

分析了无人机航摄的特点,从航摄飞行、像控布设及空三加密的实施过程,详细阐述了无人机航摄主要环节质量控制的关键技术,为无人机航摄实际生产提供参考。     

无人机航摄系统在贵州地质灾害应急中的应用

从贵州省引进和利用无人机航摄系统,提高国土资源管理工作的技术水平的背景出发,介绍无人机航摄系统的核心功能、优势和特点。特别是在6月28日贵州省关岭县岗乌镇因暴雨引发特大型滑坡碎屑流地质灾害时,对无人机航摄系统在地质灾害应急调查与监测中所发挥的重要作用进行了描述。     

无人机:测绘转型发展新装备

正航摄无人机发展现状进入21世纪,测绘地理信息领域的多家企业和科研机构开始无人机航摄作业的探索研究,先后研制了多款无人机航摄系统,广泛开展了实验应用,在云南盈江、甘肃舟曲、四川芦山、云南鲁甸等灾害应急保障,以及远离大陆的海岛礁测图、钓鱼岛影像获取与地形图测制、境外禁毒反恐等方面取得了显著成绩。     

免像控无人机航摄系统在公路带状地形测量中的应用与精度分析

正近年来,随着我国经济的高速发展,道路、河流等大型基建工程的施工与管理已经逐步迈向机械化、智能化的新台阶、新高度。无人机航摄系统也是随着国家大型基建工程的开展应运而生的全新的测绘新手段。然而无人机航摄系统由于无人机的飞行不稳定性等诸多因素造成了精度不稳定性,特别是点位高程精度多不能满足实际工程需要,是航摄工作者的普遍认识。一般的无人机航摄伴随着大量的像控、水准等辅助工作,相较于传统地形测量,优势     

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。