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基于灰色预测的粒子滤波算法 被引量:2
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作者 王天真 汤天浩 +1 位作者 张圣杰 christophe claramunt 《高技术通讯》 CAS CSCD 北大核心 2012年第4期423-428,共6页
针对标准粒子滤波(SPF)算法在目标机动时跟踪滤波性能不高的问题,引入灰色预测理论,提出了一种基于灰色预测的粒子滤波(PFGF)算法,给出了算法的具体描述和运算流程。当预先建立的状态模型不再适用于目标的真实运动状态时,该方... 针对标准粒子滤波(SPF)算法在目标机动时跟踪滤波性能不高的问题,引入灰色预测理论,提出了一种基于灰色预测的粒子滤波(PFGF)算法,给出了算法的具体描述和运算流程。当预先建立的状态模型不再适用于目标的真实运动状态时,该方法具有良好的预估性能,减少了对事先假定目标状态模型的依赖性。与SPF方法进行了蒙特卡洛仿真比较分析,实验结果证明,PFGF算法在不增加计算复杂度的情况下,提高了跟踪精度,能够很好地克服粒子退化现象。 展开更多
关键词 信息融合 粒子滤波 状态空间模型 灰色预测 粒子退化
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A Diachronic Perspective on the Use of French Spatial Data Infrastructures
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作者 Jade Georis-Creuseveau christophe claramunt +2 位作者 Francoise Gourmelon Bruno Pinaud Laurence David 《Journal of Geographic Information System》 2018年第4期344-361,共18页
Despite the recent development of many worldwide initiatives, there is still a need for the development of observation frameworks that will provide a comprehensive view of SDI’s use. Amongst the many challenges left,... Despite the recent development of many worldwide initiatives, there is still a need for the development of observation frameworks that will provide a comprehensive view of SDI’s use. Amongst the many challenges left, a thorough analysis of the information flows between existing SDIs as well as their respective uses and the way that those evolve over time is an important issue to explore. The research presented in this paper introduces a methodological framework oriented to the study of the SDIs use from a diachronic perspective. The approach is based on a Social Network Analysis (SNA) and questionnaires collected by online surveys. We develop a structural and diachronic analysis based on a series of graph-based measures identifying the main patterns that appear over time. The methodological framework is applied to a series of French SDIs and users involved in environmental management. The study identifies a series of structural differences in the data flows that emerge between the users and SDIs. Last, the diachronic network analysis provides an overall understanding on how data flows evolve over time at different institutional levels. 展开更多
关键词 Spatial Data Infrastructure USER SDIs Use Social Network Analysis
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A multi-layer modelling approach for mining versatile ports of a global maritime transportation network
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作者 Peng Peng christophe claramunt +2 位作者 Shifen Cheng Yu Yang Feng Lu 《International Journal of Digital Earth》 SCIE EI 2023年第1期2129-2151,共23页
International ports play critical roles in maintaining transportation flows and sustaining the effectiveness of global maritime logistics.Although the concept of versatile ports has been introduced to represent the sp... International ports play critical roles in maintaining transportation flows and sustaining the effectiveness of global maritime logistics.Although the concept of versatile ports has been introduced to represent the specific patterns that these ports play at the regional and global levels,there is still a need for the design and development of computational approaches that support these notions.This paper introduces a flexible multi-layer network approach for an international maritime network whose interest is that it offers a flexible model that favours the identification of the different transportation flows and versatile ports.The model is complemented by a series of structural indices complemented by a new overlap measure that evaluates the specific role of a given port across various transportation trades.The whole approach is implemented and experimented with using massive AIS maritime data that supports the automatic generation of the multi-layer network,and derivation of the structural measures while maintaining a flexible view of the maritime network.The experiments applied to the global maritime transportation network identify key versatile ports and highlight significant differences at the regional and trade flow levels. 展开更多
关键词 Versatile port multilayer network aggregated network maritime transportation vessel trajectory data
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A graph-based approach for the structural analysis of road and building layouts 被引量:2
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作者 Mathieu Domingo Rémy Thibaud christophe claramunt 《Geo-Spatial Information Science》 SCIE CSCD 2019年第1期59-72,共14页
A better understanding of the relationship between the structure and functions of urban and suburban spaces is one of the avenues of research still open for geographical information science.The research presented in t... A better understanding of the relationship between the structure and functions of urban and suburban spaces is one of the avenues of research still open for geographical information science.The research presented in this paper develops several graph-based metrics whose objective is to characterize some local and global structural properties that reflect the way the overall building layout can be cross-related to the one of the road layout.Such structural properties are modeled as an aggregation of parcels,buildings,and road networks.We introduce several computational measures(Ratio Minimum Distance,Minimum Ratio Minimum Distance,and Metric Compactness)that respectively evaluate the capability for a given road to be connected with the whole road network.These measures reveal emerging sub-network structures and point out differences between less-connective and moreconnective parts of the network.Based on these local and global properties derived from the topological and graph-based representation,and on building density metrics,this paper proposes an analysis of road and building layouts at different levels of granularity.The metrics developed are applied to a case study in which the derived properties reveal coherent as well as incoherent neighborhoods that illustrate the potential of the approach and the way buildings and roads can be relatively connected in a given urban environment.Overall,and by integrating the parcels and buildings layouts,this approach complements other previous and related works that mainly retain the configurational structure of the urban network as well as morphological studies whose focus is generally limited to the analysis of the building layout. 展开更多
关键词 Urban and suburban spaces graph-based modeling structural analysis GIS
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Geographic information science in the era of geospatial big data: A cyberspace perspective 被引量:1
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作者 Xintao Liu Min Chen +19 位作者 christophe claramunt Michael Batty Mei-Po Kwan Ahmad MSenousi Tao Cheng Josef Strobl Arzu Cöltekin John Wilson Temenoujka Bandrova Milan Konecny Paul MTorrens Fengyuan Zhang Li He Jinfeng Wang Carlo Ratti Olaf Kolditz Alexander Klippel Songnian Li Hui Lin Guonian Lu 《The Innovation》 2022年第5期21-22,共2页
The advent of information and communication technology and the Internet of Things have led our society toward a digital era.The proliferation of personal computers,smartphones,intelligent autonomous sensors,and pervas... The advent of information and communication technology and the Internet of Things have led our society toward a digital era.The proliferation of personal computers,smartphones,intelligent autonomous sensors,and pervasive network interactions with individuals have gradually shifted human activities from offline to online and from in person to virtual.This transformation has brought a series of challenges in a variety of fields,such as the dilemma of placelessness,some aspects of timelessness(no time relevance),and the changing relevance of distance in the field of geographic information science(GIScience).In the last two decades,“cyber thinking”in GIScience has received significant attention from different perspectives.For instance,human activities in“cyberspace”need to be reconsidered when coupled with the geographic space to observe the first law of geography. 展开更多
关键词 COMPUTER CYBER instance
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Trip-oriented travel time prediction (TOTTP) with historical vehicle trajectories
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作者 Tao XU Xiang LI christophe claramunt 《Frontiers of Earth Science》 SCIE CAS CSCD 2018年第2期253-263,共11页
Accurate travel time prediction is undoubtedlyof importance to both traffic managers and travelers. Inhighly-urbanized areas, trip-oriented travel time prediction(TOTTP) is valuable to travelers rather than trafficm... Accurate travel time prediction is undoubtedlyof importance to both traffic managers and travelers. Inhighly-urbanized areas, trip-oriented travel time prediction(TOTTP) is valuable to travelers rather than trafficmanagers as the former usually expect to know the traveltime of a trip which may cross over multiple road sections.There are two obstacles to the development of TOTTP,including traffic complexity and traffic data coverage. Withlarge scale historical vehicle trajectory data and meteorol-ogy data, this research develops a BPNN-based approachthrough integrating multiple factors affecting trip traveltime into a BPNN model to predict trip-oriented travel timefor OD pairs in urban network. Results of experimentsdemonstrate that it helps discover the dominate trends oftravel time changes daily and weekly, and the impact ofweather conditions is non-trivial. 展开更多
关键词 trip-oriented travel time prediction (TOTTP) urban network Back Propagation Neural Networks(BPNN) historical vehicle trajectories
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Visual exploration of movement and event data with interactive time masks
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作者 Natalia Andrienko Gennady Andrienko +8 位作者 Elena Camossi christophe claramunt Jose Manuel Cordero Garcia Georg Fuchs Melita Hadzagic Anne-Laure Jousselme Cyril Ray David Scarlatti George Vouros 《Visual Informatics》 EI 2017年第1期25-39,共15页
We introduce the concept of time mask,which is a type of temporal filter suitable for selection of multiple disjoint time intervals in which some query conditions fulfil.Such a filter can be applied to time-referenced... We introduce the concept of time mask,which is a type of temporal filter suitable for selection of multiple disjoint time intervals in which some query conditions fulfil.Such a filter can be applied to time-referenced objects,such as events and trajectories,for selecting those objects or segments of trajectories that fit in one of the selected time intervals.The selected subsets of objects or segments are dynamically summarized in various ways,and the summaries are represented visually on maps and/or other displays to enable exploration.The time mask filtering can be especially helpful in analysis of disparate data(e.g.,event records,positions of moving objects,and time series of measurements),which may come from different sources.To detect relationships between such data,the analyst may set query conditions on the basis of one dataset and investigate the subsets of objects and values in the other datasets that co-occurred in time with these conditions.We describe the desired features of an interactive tool for time mask filtering and present a possible implementation of such a tool.By example of analysing two real world data collections related to aviation and maritime traffic,we show the way of using time masks in combination with other types of filters and demonstrate the utility of the time mask filtering. 展开更多
关键词 Data visualization Interactive visualization Interaction technique
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