Maritime transports play a critical role in international trade and commerce.Massive vessels sailing around the world continuously generate vessel trajectory data that contain rich spatial–temporal patterns of vessel...Maritime transports play a critical role in international trade and commerce.Massive vessels sailing around the world continuously generate vessel trajectory data that contain rich spatial–temporal patterns of vessel navigations.Analyzing and understanding these patterns are valuable for maritime traffic surveillance and management.As essential techniques in complex data analysis and understanding,visualization and visual analysis have been widely used in vessel trajectory data analysis.This paper presents a literature review on the visualization and visual analysis of vessel trajectory data.First,we introduce commonly used vessel trajectory data sets and summarize main operations in vessel trajectory data preprocessing.Then,we provide a taxonomy of visualization and visual analysis of vessel trajectory data based on existing approaches and introduce representative works in details.Finally,we expound on the prospects of the remaining challenges and directions for future research.展开更多
GPS(Global Positioning System),GIS(Geographic Information System)技术在草原畜牧业中不断应用,产生了大量的放牧轨迹数据,文章通过数据挖掘算法与可视化方法相结合的方式对这些数据进行分析和研究,挖掘其隐含的信息并进行可视化展...GPS(Global Positioning System),GIS(Geographic Information System)技术在草原畜牧业中不断应用,产生了大量的放牧轨迹数据,文章通过数据挖掘算法与可视化方法相结合的方式对这些数据进行分析和研究,挖掘其隐含的信息并进行可视化展示.首先利用自定义ETL框架完成数据处理并按照星型模式进行存储;其次通过速度阈值划分法求得轨迹点速度,对其进行划分,筛选出停留状态的轨迹点;再次利用聚类分析模型得到牧群釆食区特征和草场分布情况;然后以可视化的方式展示聚类分析结果和轨迹点的时空属性及其他相关属性;最后将釆食区分析结果与试验区牧场实际情况作比较,验证分析结果的准确性.展开更多
大型室内活动中获取的室内人员轨迹数据具有时空复杂性高、高维且不规则等特点,给可视分析带来了一定挑战。针对该问题,面向室内人员的时空模式、人群移动模式、异常行为模式等设计了一种基于兴趣区(AOI,area of interest)划分的室内轨...大型室内活动中获取的室内人员轨迹数据具有时空复杂性高、高维且不规则等特点,给可视分析带来了一定挑战。针对该问题,面向室内人员的时空模式、人群移动模式、异常行为模式等设计了一种基于兴趣区(AOI,area of interest)划分的室内轨迹可视分析方法 ,用户可自定义兴趣区并以此为单位进行室内轨迹分析,从而确定其时空模式、移动模式或异常行为。最后,使用China Vis2019挑战赛的数据验证了所提方法的有效性,达到了通过探索式分析室内人员轨迹获取有价值信息的目的。展开更多
基金supported in part by the National Natural Science Foundation of China(No.41801313,41901397,and 61872388).
文摘Maritime transports play a critical role in international trade and commerce.Massive vessels sailing around the world continuously generate vessel trajectory data that contain rich spatial–temporal patterns of vessel navigations.Analyzing and understanding these patterns are valuable for maritime traffic surveillance and management.As essential techniques in complex data analysis and understanding,visualization and visual analysis have been widely used in vessel trajectory data analysis.This paper presents a literature review on the visualization and visual analysis of vessel trajectory data.First,we introduce commonly used vessel trajectory data sets and summarize main operations in vessel trajectory data preprocessing.Then,we provide a taxonomy of visualization and visual analysis of vessel trajectory data based on existing approaches and introduce representative works in details.Finally,we expound on the prospects of the remaining challenges and directions for future research.
文摘GPS(Global Positioning System),GIS(Geographic Information System)技术在草原畜牧业中不断应用,产生了大量的放牧轨迹数据,文章通过数据挖掘算法与可视化方法相结合的方式对这些数据进行分析和研究,挖掘其隐含的信息并进行可视化展示.首先利用自定义ETL框架完成数据处理并按照星型模式进行存储;其次通过速度阈值划分法求得轨迹点速度,对其进行划分,筛选出停留状态的轨迹点;再次利用聚类分析模型得到牧群釆食区特征和草场分布情况;然后以可视化的方式展示聚类分析结果和轨迹点的时空属性及其他相关属性;最后将釆食区分析结果与试验区牧场实际情况作比较,验证分析结果的准确性.
文摘大型室内活动中获取的室内人员轨迹数据具有时空复杂性高、高维且不规则等特点,给可视分析带来了一定挑战。针对该问题,面向室内人员的时空模式、人群移动模式、异常行为模式等设计了一种基于兴趣区(AOI,area of interest)划分的室内轨迹可视分析方法 ,用户可自定义兴趣区并以此为单位进行室内轨迹分析,从而确定其时空模式、移动模式或异常行为。最后,使用China Vis2019挑战赛的数据验证了所提方法的有效性,达到了通过探索式分析室内人员轨迹获取有价值信息的目的。