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A multi-scale and multi-orientation image retrieval method based on rotation-invariant texture features

Science china(information Sciences) 2011年第4期54卷 732-744页

作者： shao zhenfeng,li deren & zhu xianqiang state key laboratory for information engineering in surveying,mapping and remote sensing,wuhan university,129 luoyu road,wuhan 430079,china state key laboratory for information engineering in surveying Mapping and Remote Sensing Wuhan University Wuhan China

Texture retrieval is a vital branch of content-based image ***-invariant texture retrieval plays a key role in texture *** paper addresses three major issues in rotation-invariant texture retrieval: how to select the texture measurement methods,how to alleviate the influence of rotation for texture retrieval and how to apply the proper multi-scale analysis theory for texture ***,the spectrum influence between a Radon transform and a Log-polar transform was compared after the rotation effect was *** average retrieval performance of wavelet and NSCT with different retrieval parameters was also *** on such analysis,we developed a multi-scale and multi-orientation texture transform spectrum,as well as a rotation-invariant feature vector and its measurement criteria,which can represent the human visual perception sensitive to texture *** a new rotation-invariant texture retrieval algorithm was *** algorithm was developed based on non-parametric statistical features and it applies low band and high frequency directional bands of NSCT coefficients for coarse filtering and fine retrieval,*** on the Brodatz image database show that the constructed rotation-invariant feature vector is appropriate for capturing major orientations and describing detail ***,the combination of the two-step progressive retrieval strategy and multi-scale analysis method can effectively improve retrieval efficiency while ensuring a high precision compared with traditional algorithms.

关键词： NSCT Log-polar Radon rotation-invariant texture retrieval

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Processing Approach of Non-linear Adjustment Models in the Space of Non-linear Models

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Geo-Spatial information Science 2003年第2期6卷 25-30页

作者： li Chaokui zhu Qing SONG Chengfangli Chaokui,associate professor,Ph.D,state key laboratory of information engineering in surveying,mapping and remote sensing,wuhan university,129 luoyu road,wuhan 430079,china. state key laboratory of information engineering in surveying Mapping and Remote Sensing Wuhan University Wuhan China

This paper investigates the mathematic features of non-linear models and discusses the processing way of non-linear factors which contributes to the non-linearity of a non-linear model. On the basis of the error definition,this paper puts forward a new adjustment criterion, ***,this paper investigates the solution of a non-linear regression model in the non-linear model space and makes the comparison between the estimated values in non-linear model space and those in linear model space.

关键词： non-linear adjustment model model space multi-robustness

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Calibration of digital camera integration accuracy for low-cost oblique aerial photogrammetry

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Geo-Spatial information Science 2015年第2期18卷 90-96页

作者： likun liU zhenfeng shao china Ship Development and Design Center 268 Zhangzhidong RoadWuhan 430064China state key laboratory of information engineering in surveying Mapping and Remote SensingWuhan University129 Luoyu RoadWuhan 430079China Collaborative Innovation Center for Geospatial Technology 129 Luoyu RoadWuhan 430079China

This work describes a calibration process for inexpensive consumer cameras integrated into a low cost and compact aerial multi-view imager for remote sensing and *** main advantage of this design is to make the filming component lightweight and rapidly deployable,as well as reducing cost when compared with mainstream commercial oblique *** in situ flight test was carried out in *** that experiment,a meridian convergence-based approach was adopted to adjust preprocessing,the residue error and the captured images’exterior orientation linear and angular parameters were calculated by means of the direct geo-referencing approach yielding a favorable outcome for exterior orientation linear parameters of the camera,around 0.2–0.3 m deviation from the actual measured results at 1000 m flight above ground *** camera’s exterior orientation angular parametersφ,ωwhose difference compared with the standard aerial aero triangulation approach reached a high accuracy level within the intended endurance of 0.005°.These results indicate that the compact implementation of the oblique aerial imager comprised of consumer level off-the-shelf digital cameras achieved competitive accuracy at a low cost and high versatility.

关键词： oblique photogrammetry aerial imager calibration digital camera position and orientation

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基于时空位置大数据的公共疫情防控服务让城市更智慧

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武汉大学学报（信息科学版） 2020年第4期45卷 475-487,556页

作者：李德仁邵振峰于文博朱欣焰周素红武汉大学测绘遥感信息工程国家重点实验室湖北武汉430079 武汉大学遥感信息工程学院湖北武汉430079 中山大学地理科学与规划学院广东广州510275 广东省公共安全与灾害工程技术研究中心广东广州510275

智慧城市离不开时空位置大数据服务。总结国内外公共疫情防控事件对时空位置大数据的要求,调研其在当前疫情防控中提供的具体服务情况,讨论还有哪些方面无法满足公共疫情防控需求之处,重点分析下一步应该如何完善时空位置大数据服务,以... 详细信息

智慧城市离不开时空位置大数据服务。总结国内外公共疫情防控事件对时空位置大数据的要求,调研其在当前疫情防控中提供的具体服务情况,讨论还有哪些方面无法满足公共疫情防控需求之处,重点分析下一步应该如何完善时空位置大数据服务,以更好地服务于公共疫情防控,并分别从平时时空大数据位置服务的建设内容和战时数据共享机制等多方面给出建议。该文旨在采取科学手段完善时空大数据服务,力争在平时为公共疫情防控建立好技术支撑系统,并出台"战时"面向疫情防控需求的数据共享机制。

关键词：时空位置大数据公共疫情防控智慧城市位置服务

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GeoScope:Full 3D Geospatial information System Case Study

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Geo-Spatial information Science 2011年第2期14卷 150-156页

作者： ZHANG Yeting zhu Qing liU Gang ZHENG Wenting li Zhonghua DU Zhiqiang state key laboratory of information engineering in surveying Mapping and Remote Sensing Wuhan University 129 Luoyu Road Wuhan 430079 China china university of Geosciences (wuhan) 388 Lumo Road Wuhan 430074 China state key laboratory of CAD&CG Zhejiang University 100 Zijinggang Road Hangzhou 310058 China wuhan Land Resources and Planning information Center 13 Sanyang Road Wuhan 430014 China

Aiming at the integrative management and comprehensive applications of large-scale 3D geospatial information covering the full 3D space of a city, this paper briefly introduces the design and implementation of a full 3D GIS platform： GeoScope, which provides a professional solution for the massive full three-dimensional geospatial data integration, management, analysis, visualization, and applications. GeoScope is characterized by：（1） extendible software architecture based on the hierarchical message bus, facilitates multimodal integrative applications of 2D GIS and 3D GIS; （2） unified 3D city models, support multiscale se- mantic representation of outdoor ＆ indoor and aboveground ＆ underground 3D objects; （3） high-efficient 3D geospatial database engine, supports integrated management of massive 3D geospatial data for real-time applications; and （4） high-performance visualization engine exploiting the massively parallel computation architecture of modem GPUs, supports real-time realistic rendering of large-scale complicated 3D geospatial environments. The successful pilot application of GeoScope is also illustrated with the 3D city models of 8494 knl2 of the whole wuhan City, the largest city in middle china.

关键词： 3D geospatial information system 3D city models database engine visual analysis levels of detail semantic relationship

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基于多源高分辨率遥感影像的2 m不透水面一张图提取

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武汉大学学报（信息科学版） 2018年第12期43卷 1909-1915页

作者：邵振峰张源黄昕朱秀丽吴亮万波武汉大学测绘遥感信息工程国家重点实验室湖北武汉430079 武汉大学遥感信息工程学院湖北武汉430079 国家基础地理信息中心北京100830 中国地质大学(武汉)信息工程学院湖北武汉430074

不透水率是衡量城市生态环境状况的一个重要指标。当前全球范围内仅有1km和30m分辨率尺度的不透水面专题信息,无法满足城市尺度水文模型建模、海绵城市规划和建设需求。提出了图谱信息融合的不透水面提取模型,实现了基于深度学习的不透... 详细信息

不透水率是衡量城市生态环境状况的一个重要指标。当前全球范围内仅有1km和30m分辨率尺度的不透水面专题信息,无法满足城市尺度水文模型建模、海绵城市规划和建设需求。提出了图谱信息融合的不透水面提取模型,实现了基于深度学习的不透水面提取新方法,研制了不透水面遥感全流程提取和监测软件。基于多源高分辨率遥感影像首次完成了中国31个省(直辖市、自治区)的2m不透水面专题信息提取,形成全国不透水面一张图,为海绵城市和生态城市的建设提供了基础数据支撑和技术监测手段。

关键词：地表覆盖产品不透水面提取模型深度学习高分辨率遥感影像

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Photogrammetry Education for Multidisciplinary Geomatics in china

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Geo-Spatial information Science 2006年第4期9卷 273-280,305页

作者： zhu Qing state key laboratory for information engineering in surveying Mapping and Remote Sensing Wuhan University 129 Luoyu Road Wuhan 430079 China

After briefly reviews the history of photogrammetry education in china, the development of undergraduate and graduate program, and the corresponding curricula design are analyzed by use of the data from wuhan university in which the photogrammetry is awarded as the state-level key discipline. The academic educational program of photogrammetry in universities has trained students to perform tasks in all fields of the photogrammetric profession. In recent years, the nature of photogrammetry is changing and multidisciplinary geomatics are developing very rapidly, the educational program of photogrammetry has also changed in new concepts and structures to adapt very new technologies and the extension of the field. Finally, the prospect of photogrammetry education for the requirements of multidiseiplinary geomatics is proposed. The growing interest in fast and accurate 3D spatial data collection （such as city modeling and digital earth） results in the increasing need of photogrammetry as principal tool, photogrammetric courses are therefore requested to be upto date and to become one kind of the fundamental professional courses for university geomatics and remote sensing degree programs.

关键词： photogrammetry education remote sensing geomatics china

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Three-Dimensional TIN Algorithm for Digital Terrain Modeling

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Geo-Spatial information Science 2008年第2期11卷 79-85页

作者： zhu Qing ZHANG Yeting li Fengchun state key laboratory of information engineering in surveying Mapping and Remote SensingWuhan University 129 Luoyu Road Wuhan 430079 China. 不详

The problem of taking an unorganized point cloud in 3D space and fitting a polyhedral surface to those points is both important and difficult. Aiming at increasing applications of full three dimensional digital terrain surface modeling, a new algorithm for the automatic generation of three dimensional triangulated irregular network from a point cloud is pro- posed. Based on the local topological consistency test, a combined algorithm of constrained 3D Delaunay triangulation and region-growing is extended to ensure topologically correct reconstruction. This paper also introduced an efficient neighbor- ing triangle location method by making full use of the surface normal information. Experimental results prove that this algo- rithm can efficiently obtain the most reasonable reconstructed mesh surface with arbitrary topology, wherein the automati- cally reconstructed surface has only small topological difference from the true surface. This algorithm has potential applica- tions to virtual environments, computer vision, and so on.

关键词： three dimensional triangulated irregular network digital terrain surface modeling Delaunay triangulation

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Integration method of TINs and Grids for multi-resolution surface modeling

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Geo-Spatial information Science 2013年第1期16卷 61-68页

作者： Xie XIAO Xu WEIPING zhu QING Zhang YETING Du ZHIQIANG state key laboratory of information engineering in surveying Mapping and Remote SensingWuhan University129 Luoyu RoadWuhan 430079China b Faculty of Geosciences and Environmental engineering of Southwest Jiaotong university Chengdu 610031China

Highly detailed surface models and their real-time applications are increasingly popular in architecture,construction and other design and engineering ***,new and related problems have emerged concerning the efficient management of the resulting large datasets and the seamless integration of heterogeneous ***,the increasingly common requirements of local high-fidelity modeling combined with large-scale landscapes lead to difficulty in the seamless multi-resolution representation of hybrid triangulated irregular networks(TINs)and *** paper presents a hybrid data structure with high-efficiency and a related organizational method for the seamless integration of multi-resolution *** approach is characterized by(1)a self-adaptive algorithm for feature-preserving surface partitioning,(2)an efficient hybrid index structure for combined Grid and TIN surfaces,and(3)a view-dependent scheduling strategy with access to Grids of necessary resolution,giving priority to the dynamic loading of *** using typical real design datasets of highway constructions are able to achieve accuracy-preserved and real-time availability of results that prove the validity and efficiency of this approach.

关键词： surface modeling TIN Grid LoDs high fidelity

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Research and Practice in Three-Dimensional City Modeling

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Geo-Spatial information Science 2009年第1期12卷 18-24页

作者： zhu Qing state key laboratory of information engineering in surveying Mapping and Remote Sensing Wuhan University 129 Luoyu Road Wuhan 430079 China School of Communication and information engineering Shanghai University 149 Yanchang RoadShanghai 200072 China.

The way we interact with spatial data has been changed from 2D map to 3D Virtual Geographic Environment （VGE）. Three-dimensional representations of geographic information on a computer are known as VGE, and in particular 3D city models provide an efficient way to integrate massive, heterogenous geospatial information and georeferenced information in urban areas. 3D city modeling （3DCM） is an active research and practice topic in distinct application areas. This paper intro- duces different modeling paradigms employed in 3D GIS, virtual environment, and AEC/FM. Up-to-date 3DCM technologies are evolving into a data integration and collaborative approach to represent the full spatial coverage of a city, to model both aboveground and underground, outdoor and indoor environments including man-made objects and natural features with 3D geometry, appearance, topology and semantics.

关键词： 3D city model multiscale representation 3D data acquisition integrated database management

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