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1.
Geospatial Information Service Based on Digital Measurable Image——Take Image City·Wuhan as an Example 总被引：1，自引：0，他引：1
LI Deren SHEN Xin State Key Laboratory of Information Engineering in Surveying Mapping Remote Sensing Wuhan University Luoyu Road Wuhan China 《地球空间信息科学学报》2010,(2)
LBS (location-based service) is a remarkable outcome of the development from GIS to geospatial information service. Faced by the requirements of geospatial information from the masses and the opportunity provided by the next generation Internet and Web 2.0, a new model of geospatial information service based on DMI (digital measurable image) is presented. First, the concept of LBS and the opportunities of Web 2.0 are introduced, then the characteristic of DMI is discussed. Taking the Image City·Wuhan as an ... 相似文献
2.
GE Renyan Doctoral Candidate School of Information Engineering WTUSM Wuhan China 《地球空间信息科学学报》1998,(1)
With the help of CCD images,the realization of high precision po-sitioning and measurement has become the basic standard for machine vision andreal time photogrammetry systems.However,deformation and other sorts ofdegradation occurring during transmission are major limiting factors of the preci-sion attainable with most current CCD cameras and frame grabbers.So a preciseradiometric and geometric transmission of images from CCD sensor to memory is afundamental aspect of CCD camera calibration.The geometric calibration system,which uses some image processing algorithms of the CCD camera based on the re-searched and developed system is discussed.The reliability and validity are alsodiscussed.The experimental results for the calibration of the CCD array will betaken as an important quality index for CCD evaluation. 相似文献
3.
LIQi CAOJian 《地球空间信息科学学报》2004,7(2):101-103
This paper is to construct a “digital local, regional, region“ information framework based on the technology of “SIG“ and its significance and application to the regional sustainable development evaluation system. First, the concept of the “grid computing“ and “SIG“ is interpreted and discussed, then the relationship between the “grid computing“ and “digital region“ is analyzed, and the framework of the “digital region“ is put forward. Finally, the significance and application of “grid computing“ to the “region sustainable development evaluation system“ are discussed. 相似文献
4.
Quality evaluation model for map labeling 总被引：2，自引：0，他引：2
FANHong ZHANGZuxun DUDaosheng 《地球空间信息科学学报》2005,8(1):72-78
This paper discusses and sums up the basic criterions of guaranteeing the labeling quality and abstracts the four basic factors including the conflict for a label with a label, overlay for label with the features, position‘s priority and the association for a label with its feature. By establishing the scoring system, a formalized four-factors quality evaluation model is constructed. Last, this paper introduces the experimental result of the quality evaluation model applied to the automatic map labeling system-MapLabel. 相似文献
5.
基于经验模态分解的高分辨率影像融合(英文) 总被引：3，自引：0，他引：3
High resolution image fusion is a significant focus in the field of image processing. A new image fusion model is presented based on the characteristic level of empirical mode decomposition （EMD）. The intensity hue saturation （IHS） transform of the multi-spectral image first gives the intensity image. Thereafter, the 2D EMD in terms of row-column extension of the 1D EMD model is used to decompose the detailed scale image and coarse scale image from the high-resolution band image and the intensity image. Finally, a fused intensity image is obtained by reconstruction with high frequency of the high-resolution image and low frequency of the intensity image and IHS inverse transform result in the fused image. After presenting the EMD principle, a multi-scale decomposition and reconstruction algorithm of 2D EMD is defined and a fusion technique scheme is advanced based on EMD. Panchromatic band and multi-spectral band 3,2,1 of Quickbird are used to assess the quality of the fusion algorithm. After selecting the appropriate intrinsic mode function （IMF） for the merger on the basis of EMD analysis on specific row （column） pixel gray value series, the fusion scheme gives a fused image, which is compared with generally used fusion algorithms （wavelet, IHS, Brovey）. The objectives of image fusion include enhancing the visibility of the image and improving the spatial resolution and the spectral information of the original images. To assess quality of an image after fusion, information entropy and standard deviation are applied to assess spatial details of the fused images and correlation coefficient, bias index and warping degree for measuring distortion between the original image and fused image in terms of spectral information. For the proposed fusion algorithm, better results are obtained when EMD algorithm is used to perform the fusion experience. 相似文献
6.
Spatio-temporal GIS data model based on event semantics 总被引：3，自引：0，他引：3
XUZhihong BIANFuling 《地球空间信息科学学报》2003,6(3):43-47
There are mainly four kinds of models to record and deal with historical information. By taking them as reference, the spatio-temporal model based on event semantics is pro-posed. In this model, according to the way for describing an event, all the in-formation are divided into five do-mains. This paper describes the model by using the land parcel change in the cadastral information system, and ex-pounds the model by using five tables corresponding to the five domains.With the aid of this model, seven ex-amples are given on historical query,trace back and recurrence. This model can be implemented either in the ex-tended relational database or in the ob-ject-oriented database. 相似文献
7.
Methods for feature detection in laser scanning data have been studied for decades ever since the emergence of the technology.However,it is still one of the unsolved problems in LiDAR data processing due to difficulty of texture and structure information extraction in unevenly sampled points.The paper analyzes the characteristics of Laplacian of Gaussian(LoG) Filter and its potential use for structure detection in LiDAR data.A feature detection method based on LoG filtering is presented and ex-perimented on the unstructured points.The method filters the elevation value(namely,z coordinate value) of each point by convo-lution using LoG kernel within its local area and derives patterns suggesting the existence of certain types of ground ob-jects/features.The experiments are carried on a point cloud dataset acquired from a neighborhood area.The results demonstrate patterns detected at different scales and the relationship between standard deviation that defines LoG kernel and neighborhood size,which specifies the local area that is analyzed. 相似文献
8.
WAN Xiaoxia 《地球空间信息科学学报》2000,3(4):48-53
This paper presents the hypermedia data model based on the infinity RS image information system we have developed.The hypermedia data model consists of different semantic units called nodes,and the associations between nodes are called links.This paper proposes three kinds of nodes (interior node,physical node and complex node) and two kinds of links (plane network structure link,hyper-cube network structure links).The hypermedia information system,based on the model and the basic data layer (the infiniy RS image),represents a digital globe.An approach to the "Getting Lost in the Hyper-space" problem is presented.The approach using the hypermedia data model is an efficient way of handling a large number of RS images in various geographical information systems. 相似文献
9.
ZHANG Jingxiong David Roy Sadashiva Devadiga ZHENG Min 《地球空间信息科学学报》2007,10(1):44-50
With remote sensing information products becoming increasingly varied and arguably improved, scientific applications of such products rely on their quality assessment. In an operational context such as the NASA (National Aeronautics and Space Administration) information production based on the MODIS (Moderate Resolution Imaging Spectroradiometer) instrument on board Earth Observing System (EOS) Terra and Aqua satellites, efficient ways of detecting product anomaly, i.e., to discriminate between product artifacts and real changes in Earth processes being monitored, are extremely important to assist and inform the user communities about potential unreliability in the products. A technique for anomaly detection, known as MAD (the median of absolute deviate from the median), in MODIS land products via time series analysis is described, which can handle intra- and in-ter-annual variation in the data by using MAD statistics of the original data and their first-order difference. This method is shown to be robust and work across major land products, including NDVI, active fire, snow cover, and surface reflectance, and its applicabil-ity to multi-disciplinary products is anticipated. 相似文献
10.
ZOU Yijiang 《地球空间信息科学学报》2002,5(4):46-49
The components of map information are analyzed theoretically in this paper ,and the map information includes mainly the spatial information,attributive information and temporal characteristics information.Then the digital map entity is defined according to construction characteristics of the map information.Finally,on the basis of the analyses of the construction characteristics of digital map entity and present conceptual model of digital map database,an abstracted conceptual model of digital map database is presented.And the Normal Form theory of relational database is discussed particularly. 相似文献
11.
12.
Joc Triglav Dušan Petrovič Bojan Stopar 《International Journal of Applied Earth Observation and Geoinformation》2011
The global geospatial community is investing substantial effort in providing tools for geospatial data-quality information analysis and systematizing the criteria for geospatial data quality. The importance of these activities is increasing, especially in the last decade, which has witnessed an enormous expansion of geospatial data use in general and especially among mass users. Although geospatial data producers are striving to define and present data-quality standards to users and users increasingly need to assess the fitness for use of the data, the success of these activities is still far from what is expected or required. As a consequence, neglect or misunderstanding of data quality among users results in misuse or risks. This paper presents an aid in spatio-temporal quality evaluation through the use of spatio-temporal evaluation matrices (STEM) and the index of spatio-temporal anticipations (INSTANT) matrices. With the help of these two simple tools, geospatial data producers can systematically categorize and visualize the granularity of their spatio-temporal data, and users can present their requirements in the same way using business intelligence principles and a Web 2.0 approach. The basic principles and some examples are presented in the paper, and potential further applied research activities are briefly described. 相似文献
13.
LBS (location-based service) is a remarkable outcome of the development from GIS to geospatial information service. Faced
by the requirements of geospatial information from the masses and the opportunity provided by the next generation Internet
and Web 2.0, a new model of geospatial information service based on DMI (digital measurable image) is presented. First, the
concept of LBS and the opportunities of Web 2.0 are introduced, then the characteristic of DMI is discussed. Taking the Image
City·Wuhan as an example, the function of geospatial information service based on DMI is introduced. Finally, the feasibility
for its industrialization is discussed. 相似文献
14.
基础地理数据具有空间载体和知识存量两大作用。以往人们主要关注其空间载体作用，研发和提供了丰富多样的基础地理数据服务与信息服务，但对其知识存量挖掘不够，提供的地理空间知识服务极少。近年来，“数据海量，信息爆炸，知识难求”现象愈加突出，从地理数据信息服务走向知识服务势在必行，已成为测绘科技转型升级的一项重要任务。借鉴知识图谱的最新研究进展，讨论了基础地理数据、信息和知识的基本内涵，提出了以结构化和关联化为重要特征的基础地理知识服务总体思路，分析了由此带来的4方面问题；继而从领域知识体系构建、关键技术、应用服务3个方面讨论了基础地理知识服务的研究方向与重点；以GlobeLand30知识服务为例，介绍了初步研究进展。 相似文献
15.
展望5G/6G时代的地球空间信息技术 总被引：1，自引：0，他引：1
随着通信技术的发展,5G/6G时代逐渐到来。在新的网络环境下,地球空间信息技术的发展也将催生新的发展趋势。文章首先对5G/6G时代进行了论述,分析其主要特点。然后阐述了5G/6G时代下地球空间信息技术的发展趋势(真三维实景模型的形成,地球空间信息处理的智能化和自动化,地球空间信息服务的社会化和大众化)。最后分析了新时代背景下我国自主的通导遥一体化空天信息实时智能服务系统建设的必要性;分析其发展路线(局域服务系统,区域服务系统,全球服务系统)和技术储备;对5G/6G、大数据和人工智能技术支撑下,我国地球空间信息技术的发展进行了展望。 相似文献
16.
提出了空间信息原子服务的概念，阐述了其互操作模型与互操作层次结构，进而提出了空间信息原子服务的集成框架，包括服务分类框架、服务链接模式以及由空间信息原子服务、分子服务、流程服务和方案服务组成的服务集成模型。空间信息原子服务概念的提出，对于空间信息服务(GIService)的服务组织与管理、服务集成以及更好地实现软件复用和空间信息互操作等都具有重要的意义。 相似文献
17.
关于空间数据质量标准的若干问题 总被引：7，自引：0，他引：7
引入空间数据质量维的概念,在比较分析几个标准化组织提出的空间数据质量内容组成的基础上,结合我国的特点和现实要求,提出了一套可供参考的空间数据质量元素和子元素。分析了空间数据质量的3种评价模式,并将ISO/TC211的加权平均法和我国的缺陷扣分法结合,提出了基于加权平均的缺陷扣分评价方法,给出了这种方法的实现流程。 相似文献
19.
玉树地震灾情SAR遥感监测与信息服务系统 总被引：2，自引：0，他引：2
在玉树地震中,中国首套自主知识产权的机载多波段多极化干涉SAR测图系统,发挥全天时主动遥感的优势,成功服务于抗震救灾中。依据玉树地震灾情综合地理信息监测与评估工作,着重探讨SAR遥感影像用于地震灾情监测与评估中的处理方法和技术路线,研究制定了地震灾区灾情综合地理信息监测指标,通过快速几何处理、快速变化信息提取、快速目标判读和灾害空间危险性评估,实现了玉树地震震区灾情综合地理信息的解译、制图和统计评估。在此基础上,开发了玉树地震灾情综合地理信息服务系统,实现了灾情监测信息的综合管理、可视化查询和统计分析。 相似文献
20.
总结分析了典型的地球空间信息上下文,基于本体建立了面向地球空间信息服务形式化的上下文信息模型,该模型采用层次化的设计方法,并使用本体描述语言OWL描述上下文,提高了上下文表达能力。最后,设计了一个面向地球空间信息的上下文感知计算模型。 相似文献