共查询到20条相似文献，搜索用时 31 毫秒
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Nicolas Paparoditis Jean-Philippe Souchon Gilles Martinoty Marc Pierrot-Deseilligny 《ISPRS Journal of Photogrammetry and Remote Sensing》2006,60(6):400
The IGN digital camera project was established in the early 1990s. The first research surveys were carried out in 1996 and the digital camera was first used in production in 2000. In 2004 approximately 10 French departments (accounting for 10% of the territory) were covered with a four-head camera system and since summer 2005 all IGN imagery has been acquired digitally. Nevertheless the camera system is still evolving, with tests on new geometric configurations being continuously undertaken. The progressive integration of the system in IGN production workflows has allowed IGN to keep the system evolving in accordance with production needs. Remaining problems are due to specific camera characteristics such as CCD format, the optical quality of off-the-shelf lenses, and because some production tools are ill-adapted to digital images with a large dynamic range. However, when considering the pros and cons of integrating these images into production lines, the disadvantages are largely balanced by the numerous benefits this technology offers. 相似文献
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数字城市建设实施战略 总被引：1，自引：0，他引：1
介绍了数字城市的基本概念,阐述了数字城市系统的基本构成,论述了数字城市建设的主要步骤,分析了在数字城市建设过程中可能出现的问题并提出了相应的对策。对全国各地正在进行或将要进行的数字城市建设工作具有一定的指导意义。 相似文献
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A. S. Walker 《The Photogrammetric Record》1997,15(89):657-664
The revolution promised by digital photogrammetry is dependent on extensive, successful automation at many stages of the production process. The progress of automation is uneven. Digital cameras are not in widespread use. Scanners are available which include roll film transports and automated orientation, but set up for optimum tonal transfer remains interactive. Extensive automation of several operations on digital photogrammetric workstations, such as generation of digital terrain models, orthophotographs, mosaics and perspective scenes, contrasts with feature extraction, where robust products lag behind success in research. Progress towards practical automation to assist, but not replace, the human operator is significant, however, and examples are given from the Leica-Helava systems. 相似文献
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Liqiu Meng 《地球空间信息科学学报》2020,23(1):61-67
ABSTRACTGeosensing and social sensing as two digitalization mainstreams in big data era are increasingly converging toward an integrated system for the creation of semantically enriched digital Earth. Along with the rapid developments of AI technologies, this convergence has inevitably brought about a number of transformations. On the one hand, value-adding chains from raw data to products and services are becoming value-adding loops composed of four successive stages – Informing, Enabling, Engaging and Empowering (IEEE). Each stage is a dynamic loop for itself. On the other hand, the “human versus technology” relationship is upgraded toward a game-changing “human and technology” collaboration. The information loop is essentially shaped by the omnipresent reciprocity between humans and technologies as equal partners, co-learners and co-creators of new values.The paper gives an analytical review on the mutually changing roles and responsibilities of humans and technologies in the individual stages of the IEEE loop, with the aim to promote a holistic understanding of the state of the art of geospatial information science. Meanwhile, the author elicits a number of challenges facing the interwoven human-technology collaboration. The transformation to a growth mind-set may take time to realize and consolidate. Research works on large-scale semantic data integration are just in the beginning. User experiences of geovisual analytic approaches are far from being systematically studied. Finally, the ethical concerns for the handling of semantically enriched digital Earth cover not only the sensitive issues related to privacy violation, copyright infringement, abuse, etc. but also the questions of how to make technologies as controllable and understandable as possible for humans and how to keep the technological ethos within its constructive sphere of societal influence. 相似文献
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Jim H. Chandler Tom Buffin-Bélanger Steve Rice Ian Reid David J. Graham 《The Photogrammetric Record》2003,18(103):209-223
Digital photogrammetry has been used to develop and test an artificial river bed moulding and casting system, which allows the pebbles within a coarse-grain river bed to be recreated for hydraulic research in a laboratory flow channel or flume. Imagery of both the original streambed and the cast facsimile was acquired using a non-metric Kodak DCS460 digital camera and digital elevation models and orthophotographs were derived and compared to assess the accuracy of the moulding and casting system. These comparative tests proved to be critical in modifying and developing the system.
Additional imagery was obtained in the field using a non-metric Olympus C3030 'compact' digital camera to assess whether far cheaper camera technology could deliver data appropriate for such comparative examinations. Internal calibration parameter sets and data that were generated were compared with data obtained by the non-metric Kodak DCS460. These tests demonstrate that digital sensors built around high-quality 35 mm professional camera bodies and lenses are required for comparative examinations and for similar system development. 相似文献
Additional imagery was obtained in the field using a non-metric Olympus C3030 'compact' digital camera to assess whether far cheaper camera technology could deliver data appropriate for such comparative examinations. Internal calibration parameter sets and data that were generated were compared with data obtained by the non-metric Kodak DCS460. These tests demonstrate that digital sensors built around high-quality 35 mm professional camera bodies and lenses are required for comparative examinations and for similar system development. 相似文献
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The National Bureau of Surveying and Mapping of China has planned to speed up the development of spatial data infrastructure (SDI) in the coming few years. This SDI consists of four types of digital products, i. e., digital orthophotos, digital elevation models,digital line graphs and digital raster graphs. For the DEM,a scheme for the database building and updating of 1:10 000 digital elevation models has been proposed and some experimental tests have also been accomplished. This paper describes the theoretical (and/or technical)background and reports some of the experimental results to support the scheme. Various aspects of the scheme such as accuracy, data sources, data sampling, spatial resolution, terrain modeling, data organization, etc are discussed. 相似文献
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The National Bureau of Surveying and Mapping of China has planned to speed up the development of spatial data infrastructure (SDI) in the coming few years. This SDI consists of four types of digital products, i. e., digital orthophotos, digital elevation models, digital line graphs and digital raster graphs. For the DEM, a scheme for the database building and updating of 1∶10 000 digital elevation models has been proposed and some experimental tests have also been accomplished. This paper describes the theoretical (and/or technical) background and reports some of the experimental results to support the scheme. Various aspects of the scheme such as accuracy, data sources, data sampling spatial resolution, terrain modeling, data organization, etc are discussed. 相似文献
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简要回顾了我国测绘体系的发展历程,并对传统测绘体系、数字化测绘体系和信息化测绘体系三个阶段的主要区别进行了概括,进而对信息化测绘体系的建设目标及主要任务进行了重点讨论。 相似文献
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［1］Balce A E. Determination of optimum sampling interval in grid digital elevation models (DEM) data acquisition.Photogrammetric Engineering and Remote Sensing,1987,531:323～330
［2］Li Z L. Sampling strategy and accuracy assessment for digital terrain modelling: [Ph. D Thesis]. UK: University of Glasgow, 1990
［3］Li Z L. Variation of the accuracy of digital terrain models with sampling interval. Photogrammetric Record, 1992,14:113～128
［4］Li Z L. A comparative study of the accuracy of digital terrain models(DTMs) based on various data models. ISPRS Journal of Photogrammetry and Renote Sensing,1994,49(1):2～11
［5］Li Z L. Scale issues in geographic information science. In:Proceeding of International Workshop on Dynamic and Multi-dimensional GIS. Hong Kong, 1997. 143～158
［6］SISM. Specification of geospatial data (Provisional) for 1:10 000 digital elevation models. The Standard Institute of Surveying and Mapping (SISM), National Bureau of Surveying and Mapping, China, 1997(in Chinese)
［7］USGS. National Mapping Program: Geospatial Data Standard, 1992
［8］Zhu Q, Cheng C J. The fast generation and dynamic updating of TIN. Journal of Wuhan Technical University of Surveying and Mapping, 1998(in Chinese) 相似文献
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数字制图与GIS空间分析由于应用不同导致相应软件和数据不能共享,其根本原因是二者采用了不同的空间数据模型。在分析面向数字制图数据模型和面向GIS空间分析数据模型的特征基础上,提出了一种一体化的空间数据模型。该模型以面向GIS空间分析数据模型为主,面向数字制图数据模型为辅,在几何层次融合了拓扑数据模型和实体数据模型。最后,设计和开发了相应的原型系统,验证了模型的合理性和可行性。 相似文献
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关于数字城市地理空间框架建设的研究 总被引：1，自引：0，他引：1
随着我国城市化进程的发展,城市规模不断扩大,传统的城市管理方法远远不能满足现代城市管理的要求。随着＂数字中国＂战略的提出,＂数字城市＂应运而生。当前以＂数字城市＂为标志的城市信息化建设正在全国范围内迅速开展,网络基础设施和空间信息基础设施是数字城市建设中两个最为重要的基础设施,而地理空间框架是空间信息基础设施的重要组成部分,是经济社会信息化发展的基础支撑平台。 相似文献
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Scanning of analogue images has become a key hardware technology specific to modern digital photogrammetry. Since specialised photogrammetric scanners have been introduced in the late 1980s, a gradual development and improvement of their performance regarding hardware, software and functionality, and productivity has been observed. Originally, geometric accuracy of scanners was the overriding specification for scanners. This is increasingly being augmented by a concern for good colour and radiometric performance. This article describes the UltraScan 5000, a modern photogrammetric scanner manufactured by Vexcel Imaging Austria, and its features, assesses its radiometric and geometric performance with various well-founded tests, and discusses its versatility and use in production. The UltraScan 5000 was introduced in November 1998 and since then, a surprisingly large number of systems has been installed worldwide. Their successful operation illustrates on a daily basis the validity of the technical solution and tests at user sites have confirmed a good to excellent performance regarding geometric accuracy and resolution, radiometric performance (noise, dynamic range) and colour rendition. 相似文献
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在分析数字城市建设现状及其存在的问题基础上,提出了三维数字城市建设项目的设计思想和技术路线,对系统的开发结构和系统功能模块设计进行了详细的描述,最后阐述了所涉及的关键技术、系统的应用情况和与国内外同类技术的综合比较。 相似文献
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浅谈《数字化测图》课程的教学设置 总被引：2，自引：1，他引：1
近年来,数字技术正日新月异的发展着。该技术在测绘行业中也得到广泛应用。数字化测图技术的出现,便是这一成果的运用。简单地说,数字测图就是用数字形式存储全部地图信息的“地图”,它是用数字形式描述地图要素的属性、定位和关系信息的数据集合,是存储在具有直接存取性能的介质上的关联数据文件。我校的测绘本科专业和地信本科专业较早地开设了这门课程,取得了较好的教学效果。 相似文献
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This paper discusses the work carried out to obtain stereoscopic "photography" from airborne platforms with a Kodak DCS200 digital camera, as part of an investigation into the suitability of current digital camera technology for use in air survey. Details of the work, from the initial test flight in a Cessna light aircraft through to tests utilizing a Thruster microlight platform, are documented. The paper concludes with a summary of the present shortcomings in obtaining aerial photography for survey purposes with still video technology and discusses the future prospects. 相似文献