共查询到20条相似文献，搜索用时 93 毫秒
1.
《武汉大学学报(信息科学版)》2010,(8)
比较了传感器的相关信息模型,分析了传感器建模语言(SensorML)规范,提出了基于SensorML的遥感卫星传感器建模方法,包括平台参数分析、字典定义、系统建模、处理建模、模型验证和模型修正。基于.NET框架和SensorML 1.0.0规范,设计和实现了遥感卫星传感器建模工具SensorModel。以SPOT-5卫星传感器为例,验证了该方法的可行性。 相似文献
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智慧测绘地理信息服务的发展对实景三维模型的真实感、实用性和精度提出了更高的要求，如何快速生产高精细、高精度实景三维模型成为测绘地理信息热点研究方向之一。本文结合空中倾斜摄影测量建模的特点，探索了基于空中倾斜摄影和地面近景摄影测量快速进行一体化建模的技术，从近景传感器设计、数据采集、数据处理三方面探究了一套高效的空地一体化建模工艺，并完成了试验区的空地一体化实景模型制作，取得了较好的效果。该项研究弥补了空中倾斜摄影建模在近地面模型变形甚至缺失的不足，使基于倾斜摄影测量进行实景建模进入了一个新的阶段。 相似文献
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基于二三维地理信息系统,结合石油行业的作业区井、间、站等物联网传感器监测数据,综合利用聚类、分类等多种数据挖掘算法,实现关键物联网传感器的采集数据分析建模,并基于实时更新数据进行模型增量式训练,从而实现基于GIS的传感器故障诊断和预警分析。试验结果标明,系统不仅可以实现设备故障的预警,而且在操作层面和用户界面层面具有方便快捷和更佳用户体验的特点。 相似文献
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赵跃 《测绘与空间地理信息》2021,44(5):199-200,204
倾斜摄影测量技术在三维建模方面有着广泛前景.本文介绍了倾斜摄影测量技术的概念及特点,分析了基于倾斜摄影的三维建模的方法及其建模过程中和输出模型存在的问题,提出基于倾斜摄影测量的三维模型优化方法,通过优化改善三维模型质量. 相似文献
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基于法平面的GIS平面随机线元概率算法 总被引：6，自引：1，他引：6
基于概率论与数值分析,研究基于线元法平面的GIS中平面随机线元落入其相应误差模型内的概率算法,通过实例计算与可视化分析,比较基于误差模型建模机理的概率算法,并得出如下结论:基于线元法平面的概率算法与基于误差模型建模机理的概率算法对GIS中随机线元误差模型的建模是等价的,而且对于GIS中一般曲线的误差模型建模而言,前者具有通用性。 相似文献
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倾斜摄影测量三维建模技术对预防油库突发性危险监测具有较大作用,但其部分三维模型精度不能满足信息化平台精细模型的需求.本文针对无人机低空倾斜摄影测量在油库模型建模过程中存在的油罐三维模型漏洞、消防栓模型扭曲、油管模型变形等问题,提出一种基于倾斜摄影测量与多源数据融合的三维建模方法.实践表明:该方法能够解决模型漏洞、模型细节粗糙、模型纹理模糊等问题,可为"数字城市"提供信息化平台并得到应用. 相似文献
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倾斜摄影测量技术是一项高新技术,它通过在同一飞行器上搭载多台传感器,同时从五个不同的角度采集影像,从而快速建立城市3维模型,能够有效地降低城市3维模型建模成本. 相似文献
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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。 相似文献
12.
Monitoring drought dynamics in the Aravalli region (India) using different indices based on ground and remote sensing data 总被引：5，自引：0，他引：5
C. Bhuiyan R.P. Singh F.N. Kogan 《International Journal of Applied Earth Observation and Geoinformation》2006,8(4):289-302
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. 相似文献
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Piyoosh Rautela Ramesh Chandra Lakhera 《International Journal of Applied Earth Observation and Geoinformation》2000,2(3-4)
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. 相似文献
14.
ZHAN F. Benjamin 《地球空间信息科学学报》2011,(1)
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... 相似文献
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GNSS系统及其技术的发展研究 总被引：3，自引：1，他引：2
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. 相似文献
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“4D”技术及其应用 总被引：13，自引：0，他引：13
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。 相似文献
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《International Journal of Digital Earth》2013,6(1):66-87
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. 相似文献
18.
Toward seamless indoor-outdoor applications: Developing stakeholder-oriented location-based services
Kohei OGAWA Edward VERBREE Sisi ZLATANOVA Naohiko KOHTAKE Yoshiaki OHKAMI 《地球空间信息科学学报》2011,14(2):109-118
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. 相似文献
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地理数据库的关系模型及其实现 总被引：1，自引：0，他引：1
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。 相似文献