共查询到19条相似文献，搜索用时 161 毫秒
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基于Internet/Intranet的开放式地理信息系统Web GIS，为人类共享遥感影像这一人类共同的资源，提供了快捷灵活的手段。尤其是1998年以来，在“数字地球”的设想下，遥感影像数据无疑会在未来“数字地球”建设中占有重要地位。但是，海量遥感影像数据和网络有限带宽这对矛盾严重地影响着遥感影像的充分应用。国际标准化组织（ISO）和图像专家联合小组（Joint Photographic Experts Group,JPEG)于1997年提出的JPEG2000图像标准，将会很好地解决这一矛盾。该文将论述基于该标准的遥感影像，在Web GIS上的应用实现及结构。 相似文献
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现代三维数字地球已成为GIS技术应用的常用前端展现平台,采用的海量高分辨率遥感影像、分层地名数据和DEM数据的数字地球能否提供高效服务成为制约数字地球框架实用性的关键因素。本文对目前流行的由World Wind项目组基于OGC标准实现的WMS服务及通过Geo Server项目实现的地名服务建立基础地理集群服务的方法进行了研究,同时还针对不同分辨率、不同存储模式的的影像数据服务效率给出了实际分析测试结果。 相似文献
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遥感图像压缩会影响分类精度,是值得研究的问题。以高分辨率遥感影像(Quick Bird)的监督分类精度评定为尺度,采用ER Mapper软件的JPEG 2000图像压缩模块对图像进行压缩,再在eCognition软件中对这9种压缩比图像进行面向对象的监督分类,生成分类精度报告。通过分析分类精度的变化,研究了JPEG 2000压缩对遥感影像分类的影响程度及其在遥感影像压缩方面的应用潜力。 相似文献
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北京超图地理信息技术有限公司 《国土资源遥感》2006,(3):86-86
EARTH RESOURCE MAPPING公司成立于1989年，总部设在澳大利亚西部的佩思。多年来，公司一直保持着持续稳定的发展，用户遍布全球。其旗舰产品ER Mapper是国际著名的遥感软件，提供了各种遥感影像处理功能，其强大的小波压缩技术使海量数据的处理变得简单。还配有软件压缩开发工具包（ECW、JPEG 2000、SDK）和海量影像网上发布系统（Image Web Sere，简称IWS）。从影像处理到网络发布，为用户提供全方位的遥感影像应用解决方案。 相似文献
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遥感图像与GIS数据的配准是遥感应用、遥感与GIS集成的基础和关键。本文针对不同来源的道路网数据,提出了基于轮廓图匹配的遥感影像和地理空间数据集配准的方法。在两个数据集综合时,将最新的遥感影像及其被提取的特征作为参考数据,将已有的GIS数据与矫正后的遥感影像进行匹配。实验结果表明,该方法可普遍应用于城市道路网的信息提取与配准,即使在道路被部分遮挡的情况下,所提出的轮廓判读和匹配方法,正确匹配和识别的概率仍可达到93%以上。 相似文献
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随着深度学习的发展,遥感影像处理技术也从传统机器学习算法向深度学习转变,然而,用于遥感图像的训练数据集却十分稀少,且数据标注困难。本文将GIS技术与图像标注技术相结合,基于Flask Web框架设计一个可用于海量遥感数据的标注系统。该系统可用于海量遥感数据的数据框标注、数据类别标注,以及目标关键点标注,同时能将标注数据导出为深度学习训练最常用的COCO数据集和VOC2007两种格式。 相似文献
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一种基于面特征的遥感影像与GIS数据配准方法 总被引：7，自引：0，他引：7
遥感图像与GIS数据的配准是遥感应用、遥感与GIS集成的基础和关键.目前的方式大多是通过人工选取一点数量的控制点,通过几何纠正模型把遥感图像纳入到GIS坐标系统中,同时改正遥感图像的几何畸变.随着遥感技术的发展,传统人工作业方法无论是从效率还是从质量上都无法满足日益增长的应用需求,因此需要研究实用化的遥感影像与GIS数据的自动配准方法.本文从实用化的角度出发,在分析特征匹配理论的基础上,提出了一种基于面状地物多边形特征的遥感影像与GIS数据自动配准方法.该方法不同于一般的特征匹配方法之处在于特征提取与特征匹配同步解求.本文对新方法的理论进行了详细论述,最后对上海浦东地区的QUICKBIRD影像和1：2000 GIS数据进行了配准实验,对比传统方法计算结果,新方法具有明显优势. 相似文献
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遥感技术革命性地拓展了人类观测地球的手段和能力，遥感数据理解已成为当前认知地球变化、了解人类活动的重要工具。遥感影像分类是遥感图像理解的基石，在地物观测和变化检测等领域正发挥着关键作用。现有机器学习方法多基于图像直接提取图像特征预测类别标签，然而图像特征与类别标签之间存在较大的语义鸿沟，面向少样本、细粒度的遥感影像进行分类仍是当前非常具有挑战性的任务。 相似文献
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《International Journal of Digital Earth》2013,6(2):91-105
The effect of Digital Earth on our life is vital. Developing and updating Geospatial data in Digital Earth is also essential. This paper presents the application of a new approach of image registration in Digital Earth. The approach was developed based on registering a mono photograph on a master 3D model. The result is a 3D vector model, which can be broadly applied in visualisation, mapping, geographic information system (GIS), planning, change detection, as well as Digital Earth. The approach does not require parameters of correction for transformation. The accuracy of the output depends on the accuracy of the master data. This approach is very versatile and able to register any image on the digital elevation model, digital surface model and topographic 3D model. 相似文献
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《International Journal of Digital Earth》2013,6(6):471-486
Spatial analysis, including viewshed analysis, is an important aspect of the Digital Earth system. Viewshed analysis is usually performed on a large scale, so efficiency is important in any Digital Earth application making these calculations. In this paper, a real-time algorithm for viewshed analysis in 3D scenes is presented by using the parallel computing capabilities of a graphics processing unit (GPU). In contrast to traditional algorithms based on line-of-sight, this algorithm runs completely within the programmable 3D visualization pipeline to render 3D terrains with viewshed analysis. The most important difference is its integration of the viewshed calculation with the rendering module. Invisible areas are rendered as shadows in the 3D scene. The algorithm process is paralleled by rasterizer units in the graphics card and by vertex and pixel shaders executed on the GPU. We have implemented this method in our 3D Digital Earth system with the DirectX 9.0c API and tested on some consumer-level PC platforms with interactive frame-rates and high image quality. Our algorithm has been widely used in related systems based on Digital Earth. 相似文献
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Global geospatial data from Earth observation: status and issues 总被引：1，自引：0，他引：1
ABSTRACTData covering the whole of the surface of the Earth in a homogeneous and reliable manner has been accumulating over many years. This type of data became available from meteorological satellites from the 1960s and from Earth-observing satellites at a small scale from the early 1970s but has gradually accumulated at larger scales up to the present day when we now have data covering many environmental themes at large scales. These data have been used to generate information which is presented in the form of global data sets. This paper will give a brief introduction to the development of Earth observation and to the organisations and sensors which collect data and produce global geospatial data sets. Means of accessing global data sets will set out the types of data available that will be covered. Digital elevation models are discussed in a separate section because of their importance in georeferencing image data as well as their application to analysis of thematic data. The paper will also examine issues of availability, accuracy, validation and reliability and will look at future challenges. 相似文献
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《International Journal of Digital Earth》2013,6(1):1-3
ABSTRACTDigital Earth has seen great progress during the last 19 years. When it entered into the era of big data, Digital Earth developed into a new stage, namely one characterized by ‘Big Earth Data’, confronting new challenges and opportunities. In this paper we give an overview of the development of Digital Earth by summarizing research achievements and marking the milestones of Digital Earth’s development. Then, the opportunities and challenges that Big Earth Data faces are discussed. As a data-intensive scientific research approach, Big Earth Data provides a new vision and methodology to Earth sciences, and the paper identifies the advantages of Big Earth Data to scientific research, especially in knowledge discovery and global change research. We believe that Big Earth Data will advance and promote the development of Digital Earth. 相似文献
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数字地球是21世纪的重大技术工程,数字城市是数字地球应用的主要方面之一。依据我国数字城市建设的现状,提出构建"郑州市空间信息基础设施",并对其内容、应用、关键技术、实现策略等进行了论述及探讨。 相似文献