GeoSurveillance: a GIS-based system for the detection and monitoring of spatial clusters     

Ikuho Yamada  Peter A. Rogerson  Gyoungju Lee 《Journal of Geographical Systems》2009,11(2):155-173

This article introduces a software package named GeoSurveillance that combines spatial statistical techniques and GIS routines to perform tests for the detection and monitoring of spatial clustering. GeoSurveillance provides both retrospective and prospective tests. While retrospective tests are applied to spatial data collected for a particular point in time, prospective tests attempt to incorporate the dynamic nature of spatial patterns via analyzing time-series data to detect emergent clusters as quickly as possible. This article will outline the structure of GeoSurveillance as well as describe the statistical cluster detection methods implemented in the software. It concludes with an illustration of the use of the software to analyze the spatial pattern of low birth weights in Los Angeles County, California.   相似文献   

数字影像分析技术在海滩环境监测的应用     

胡亚丽  李晶珩  阎子衿  于新生 《海洋科学》2014,38(5):95-99

运用视频监测技术对青岛石老人海滩进行环境变化的监测,将基于高斯混合模型的聚类方法应用于数字影像中进行浒苔目标分割,并计算出浒苔的面积。分析结果表明,该项技术能够对海滩浒苔等海滩环境进行实时的监测,从而避免浒苔在海滩的堆积,对浴场海滩的环境及旅游业的发展都具有重要意义。  相似文献   

基于网络视频的建设工程监管系统研究     

徐占华  邓剑锋 《北京测绘》2014,(3):11-14

探讨网络视频应用于建设工程监管领域的系统建设,介绍了系统框架、数据建设、功能设计和技术路线,以重庆市重点建设工程为例进行项目开发并在建委系统取得了试用,最后指出全过程、多传感、集成的体制性建设工程监管系统是未来趋势。  相似文献   

基于GPU和UNITY的嵌入式图像实时传输方法     

王凤瑞  范冲  莫东霖  房骥 《测绘与空间地理信息》2022,45(1):25-29

智能化无人矿山对作业现场环境的可视化要求较高,现有的可视化方法仍存在诸多问题:数据采集方式单一,存在监控盲区;数据传输线缆布设困难且易被损坏,传输延时较高;表现形式不够全面立体,并且不能用于VR/AR、SLAM、机器人定位避障等应用场景。为了满足智能矿山建设的可视化需求,本文结合当前传感技术、矿用机器人以及5G技术的发展,探讨了从数据采集、服务器部署到接收显示的详细步骤。针对全景及深度影像这类新型三维数据,提出一种基于GPU和UNITY的嵌入式视频实时传输方法,包括实时编码、异步传输、轻量级的嵌入式流媒体系统、利用UNITY实时处理以及元数据的同步传输。借助UNITY平台,将三维可视化任务从CPU转移至GPU,仿真实验表明,最高渲染帧率为60 fps时,GPU占用率在35%以下。最后,以全景和深度传感器为例进行了测试,对数据编码、位移贴图、纹理纠正进行有效性验证,并从延迟、帧率、CPU占用率3个方面评估性能。结果表明,所提关键技术均可有效提高运行效率、减少资源占用,相比FFplay延时更低。全景影像的可视化代替了视角固定的传统监控,深度数据为智能矿山巡检机器人定位及避障提供实时数据源,传输方法整体向下兼容。不仅解决传统方法视角单一、布线困难的问题,而且考虑到了智能矿山建设过程中的新需求。  相似文献   

不同地形环境下无人机航线规划及三维建模分析     

毕瑞  甘淑  袁希平  李绕波  高莎 《测绘通报》2022,(4):83-89+129

针对不同地形环境下存在的飞行安全性低、数据冗余、构建三维模型质量和精度差等问题,本文以单镜头四旋翼小型无人机为试验设备,对平坦地形环境下的复杂单体建筑使用井字形交叉航线和环视航线;对复杂山地地形环境下的泥石流沟谷使用水平航线、井字形交叉航线及视频航线构建三维模型,并结合航线参数、三维模型质量和精度,探讨了不同地形环境下无人机航线规划方案对三维模型构建的影响。经评价分析可知:①使用环视航线能安全、快速地获取平坦地形下的复杂单体建筑影像,构建完整、质量好、精度高的三维模型;②使用井字形交叉航线能构建山地地形下泥石流沟谷的完整、质量好、精度高的三维模型,但飞行安全性、时效性较低;③使用视频航线,影像重叠度高,能构建完整、质量好的三维模型,模型精度并无明显差异。  相似文献   

PolarGlobe: A web-wide virtual globe system for visualizing multidimensional,time-varying,big climate data     

Wenwen Li  Sizhe Wang 《International journal of geographical information science》2017,31(8):1562-1582

The increasing research interest in global climate change and the rise of the public awareness have generated a significant demand for new tools to support effective visualization of big climate data in a cyber environment such that anyone from any location with an Internet connection and a web browser can easily view and comprehend the data. In response to the demand, this paper introduces a new web-based platform for visualizing multidimensional, time-varying climate data on a virtual globe. The web-based platform is built upon a virtual globe system Cesium, which is open-source, highly extendable and capable of being easily integrated into a web environment. The emerging WebGL technique is adapted to support interactive rendering of 3D graphics with hardware graphics acceleration. To address the challenges of transmitting and visualizing voluminous, complex climate data over the Internet to support real-time visualization, we develop a stream encoding and transmission strategy based on video-compression techniques. This strategy allows dynamic provision of scientific data in different precisions to balance the needs for scientific analysis and visualization cost. Approaches to represent, encode and decode processed data are also introduced in detail to show the operational workflow. Finally, we conduct several experiments to demonstrate the performance of the proposed strategy under different network conditions. A prototype, PolarGlobe, has been developed to visualize climate data in the Arctic regions from multiple angles.  相似文献   

基于GIS的远程移动视频监控系统   总被引：3，自引：0，他引：3  

秦凯  许慧鹏 《地理空间信息》2008,6(1):87-89

针对实际应用,从系统架构、应用解析、实现方法等方面介绍了将GIS技术应用于远程移动视频监控系统的解决方案。提出的视频与GIS数据集成方法是一个新的技术尝试,具有应用价值。  相似文献   

顾及像面畸变的卫星视频稳像     

王霞  张过  沈欣  李贝贝  蒋永华 《测绘学报》2016,45(2):194-198

卫星视频每帧影像外方位元素数值存在差别,相邻帧影像间的同名点在像面位置不同,且由于每帧影像均存在几何畸变,经典的帧间的投影变换模型、仿射变换模型等视频稳像的配准模型不能精确描述帧间的同名点关系。针对该问题,本文提出顾及像面畸变的卫星视频稳像算法,基于仿真的卫星视频,验证了该算法的可行性和精度。  相似文献   

ZQZ TF型风传感器冻结故障自动检测装置设计     

朱世恒  何晓庆  朱平 《气象科技》2016,44(6):902-906

近年来我国大部分地区在冬、春两季多遭受冻雨灾害,自动气象站的风向风速传感器容易因冻结而无法正常工作。针对冻结故障的实时检测问题,本文设计了一种基于ZQZ-TF型风传感器的故障自动检测装置。该装置通过检测风传感器的工作电压和工作电流,实现对传感器实时状态的监控。同时,结合具体的故障诊断算法,能够快速判断风传感器是否被冻结。系统的核心硬件电路、软件算法可分别集成在自动气象站风向风速数据采集电路和嵌入式软件中,具有结构紧凑、操作简单的特点。经验证,该装置能够实时检测风传感器冻结故障,且工作稳定,检测精度高。  相似文献   

Integration of GIS and video surveillance     

Aleksandar Milosavljević  Dejan Rančić  Aleksandar Dimitrijević  Bratislav Predić  Vladan Mihajlović 《International journal of geographical information science》2016,30(10):2089-2107

This paper discusses the integration of three-dimensional (3D) geographic information systems (GIS) and video surveillance systems using augmented reality (AR) techniques. The motivation for this integration is to overcome problems faced by conventional video surveillance systems. Explicit information concerning which camera currently monitors what area in such systems is missing; therefore, insight into the situation depends heavily on the operator’s training and experience. To ensure the complete coordination and monitoring of a situation in a system with multiple cameras, it is necessary to introduce a single reference system. GIS arises as a natural solution because it not only provides a solid ground truth but also provides semantic information that can be highly important in certain video surveillance applications. To integrate information into a GIS application, that information must be georeferenced. Based on our previous research regarding the addition of georeferencing information to surveillance video, this paper introduces models that can be applied to help integrate video and GIS. With an analogy to Milgram’s continuum between the real world and virtual reality, and analogous to the augmented reality and augmented virtuality in Milgram’s continuum, two models of integration are defined here: GIS-augmented video and video-augmented GIS. Then, we define the architecture of GIS-based video surveillance based on these proposed integration models, and finally, a prototype is implemented. The implemented prototype serves as a basis for analysing possible applications of real-world systems based on the integration of GIS and video.  相似文献