共查询到20条相似文献，搜索用时 62 毫秒
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数字高程模型(DEM)作为数字测绘产品生产中一种新的生产技术手段，以其高精度且现势性强的优势已应用于国际测绘市场上。针对不同区域采用不同形式的数据采集方法进行数字高程模型的技术获取，可通过建立DEM数据生产的质量控制，实现与国际测绘技术规范的接轨。 相似文献
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围绕基于DEM数据的地貌要素提取,对DEM的精度评价方法,基于DEM数据的地形特征提取原理及典型算法进行了研究,总结了基于DEM数据生产数字线划图的技术特点,设计了作业流程,并进行了生产试验。试验表明,在采用高分辨率DEM数据的情况下,基于DEM的数字线划图生产可满足基本等高距大于2 m、比例尺小于1∶2000的数字线划图生产,可以作为摄影测量的一种补充技术。 相似文献
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数字化地形图等高线法是目前生成DEM的一种有效方法,本文介绍了利用等高线作为数据源,在工程中大规模、批量化生产DEM时,DEM快速生产软件的设计思想以及开发过程中的主要技术等。该软件已申请专利,并成功应用于国家1：50000数据库更新工程DEM更新生产中,具有低成本、高效率、自动化等特点,取得了巨大的经济效益以及社会效益。 相似文献
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针对InSAR技术在地形复杂区域生成的DEM可能存在错误或空洞等无效点导致可用性降低的问题,本文提出了一种升降轨DEM融合方法,利用Sentinel-1 SARVV单视复数升降轨数据干涉处理得到的DEM与已有TanDEM-X升降轨DEM为例,分析升降轨DEM存在问题并将外部辅助DEM的方差作为参考进行升降轨DEM异常点判别,依据干涉对的相干系数与垂直基线高度加权融合得到最终DEM.结果表明,两种产品在地形复杂区域融合得到的DEM异常点占比较升降轨DEM明显减少,Sentinel-1选取较平坦区域融合后DEM异常点占比由升轨、降轨的5.9％和3.7％降至0.1％,融合后地形较完整,TanDEM-X选取包含水域区域与山地区域融合后异常点占比由升轨、降轨的1.2％和1.8％、2.1％和0.7％减少到0.2％和0.3％,融合后DEM较好地消除了异常点与修复了错误区域,可用性提高. 相似文献
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大比例尺DEM生产过程中的粗差检测与质量控制的研究 总被引：3，自引：0，他引：3
为了保证DEM的精度的可靠性，探讨了从已有矢量地形图和全数字摄影测量两个方面制作DEM的方法，同时就生产过程中对DEM的粗差检测和质量控制做了阐述。 相似文献
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1：50000数字高程模型（DEM）生产中有关问题初探 总被引：4，自引：0，他引：4
总结了1：50000DEM生产实践中,在技术,管理上取得的一些经验,对生产中各环节的实际问题提出了一些建立,目的为以后各种比例尺的DEM生产提供参考。 相似文献
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刘宝玲 《测绘与空间地理信息》2000,23(4):43
总结了1:50 000DEM生产实践中,在技术、管理上取得的一些经验,对生产中各环节的实际问题提出一些建议,目的为以后各种比例尺的DEM生产提供参考. 相似文献
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冯书玉 《测绘与空间地理信息》2013,(3):194-196
联系实际生产,重点介绍了在1∶10 000生产中利用GeowayDPS DEM模块制作DEM的方法和GeowayDPSDEM模块的优缺点。 相似文献
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HU Peng HU Yuju YANG Chuanyong WU Yanlan HU Haiprofessor School of Resource Environment Science Wuhan University Luoyu Road Wuhan China. 《地球空间信息科学学报》2002,5(3):33-40
Based on the developing tendency of present China‘s basic GIS,this paper discusses the designing idea for scales of 1∶10 000,1∶50 000,1∶250 000 and 1∶1 000 000 pyramidlike multilayer and multiresolution of the basic GIS.A technical line for the construction of basic GIS of the whole country and various provinces for sustainable development is put forward.And some important theoretical GIS issues touched by the technical process are discussed. 相似文献
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陈鹰 《武汉大学学报(信息科学版)》1988,(4)
本文从王之卓教授关于“数字图象处理将是摄影测量的一个新的作业领域”的观点出发,介绍了用数字图象处理的方法解决摄影测量问题方面的某些进展,主要是:快速数字微分纠正,影象增强与镶嵌,数字立体正射影象图,LANDSAT和SPOT卫星图象的参量估计与星历数据的利用。 相似文献
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The Z/I Imaging Digital Camera System 总被引：1，自引：0，他引：1
Market needs for airborne and spaceborne imagery used in photogrammetry and GIS applications are changing. Fundamental changes in sensors, platforms and applications are currently taking place. Most recently, new high resolution spaceborne sensors have become available. Besides classical photogrammetry, new thematic applications will drive the future image market. Savings in cost and time, together with the need for higher and reproducible radiometric resolution or spectral information will push forward the change from analogue to digital imagery. High resolution satellites will compete with airborne film-based photography and digital camera systems.
With the availability of a digital airborne camera, it is possible to completely close the digital chain from image acquisition to exploitation and data distribution. The key decision regarding the camera design in this case is whether a linear or area array sensor should be used. In view of the high geometric accuracy requirements in photogrammetry, Z/I Imaging has focused development on a digital camera based on an area sensor. An essential aspect of this decision was not only the aerial camera system, but also the entire photogrammetric process to the finished photographic or mapping product. If this point of view is adopted, it becomes clear that the development of a digital camera involves more than simply exchanging film for silicon. Aspects such as data transfer rates, in-flight data processing and storage, image archiving, georeferencing, colour fusion, calibration and preprocessing have the same influence on the economic assessment of a digital camera system. This paper describes current development activities and application aspects of a digital modular airborne camera system. 相似文献
With the availability of a digital airborne camera, it is possible to completely close the digital chain from image acquisition to exploitation and data distribution. The key decision regarding the camera design in this case is whether a linear or area array sensor should be used. In view of the high geometric accuracy requirements in photogrammetry, Z/I Imaging has focused development on a digital camera based on an area sensor. An essential aspect of this decision was not only the aerial camera system, but also the entire photogrammetric process to the finished photographic or mapping product. If this point of view is adopted, it becomes clear that the development of a digital camera involves more than simply exchanging film for silicon. Aspects such as data transfer rates, in-flight data processing and storage, image archiving, georeferencing, colour fusion, calibration and preprocessing have the same influence on the economic assessment of a digital camera system. This paper describes current development activities and application aspects of a digital modular airborne camera system. 相似文献
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对数字正射影像图的定义及其产品的制作方法进行了详细介绍,并通过数字城市这一实例来说明正射影像图的应用. 相似文献
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This paper introduces the subject of digital sensors for aerial survey by reviewing the use made of small format digital cameras in such an application. The major advantages and disadvantages of employing such consumer technology for aerial survey are highlighted. Finally, a specification is proposed for a minimum requirement for a digital solution based on a single area array sensor. 相似文献
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Based on the developing tendency of present China's basic GIS, this paper discusses the designing idea for scales of 1∶10 000, 1∶50 000, 1∶250 000 and 1∶1 000 000 pyramidlike multi-layer and multi-resolution of the basic GIS. A technical line for the construction of basic GIS of the whole country and various provinces for sustainable development is put forward. And some important theoretical GIS issues touched by the technical process are discussed. 相似文献
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《International Journal of Digital Earth》2013,6(1):43-65
Abstract The Digital Earth concept as originally proposed by former US Vice president Al Gore is now well established and widely adopted internationally. Similarly, many researchers world-wide are studying the causes, effects and impacts of Global Change. The authors commence by describing a five-step approach to the development of Digital Earth technologies. This is followed by a detailed account of Digital Earth research and developments in China. The authors then present the research results of Global Change studies carried out in China, based on the Digital Earth approach. These research results are based on a classification of global change regions. This covers the following global change situations: Forest and grassland fires in Northern China, temperate region desertification and dust storms, underground coal fires, deforestation and carbon sequestration, protection and utilisation of wetlands, Avian Influenza and the spread of diseases, Tibet Plateau uplift and sub-tropical monsoon climate region, and sea-level rise. The research results show that the environment does not behave in a way easily understood by the traditional disciplinary approach. Although man is clearly a contributing factor to certain Global Change aspects, such as underground coal fires, desertification, land use changes etc., many of the aspects of Global Change are naturally occurring phenomena which have been changing over centuries, and will continue to do so, no matter what actions we undertake to reverse these processes. Hence, in their conclusions, the authors propose that the communities involved in Digital Earth modelling and in Global Change research co-operate closer to overcome the limitations inherent in the current ‘conventional’ scientific approach, where scientists have very much stayed within their respective scientific boundaries. Such an integrated approach will enable us to build the next level of scientific infrastructure required to understand and predict naturally occurring environmental changes, as well as that of coupled human–environmental systems. 相似文献
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GPS辅助数字摄影测量 总被引：10，自引：3，他引：10
数码相机在航空摄影测量中的应用,没有了传统胶片的冲洗等后处理过程,拍摄完毕马上就能对拍摄的影像质量以及拍摄有无漏洞进行检查,这就使得航摄作业快速、灵活、方便。GPS与数码相机结合应用于摄影测量将极大地减少航摄地面控制测量的工作量,这必将大力促进数码相机在摄影测量中的应用。 相似文献
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