基于Web的数据可视化技术探讨

随着移动互联网时代的到来,人类社会已经进入了大数据时代。计算机在处理数据的过程中,要对部分不具有几何属性的信息进行抽象,借助数据挖掘技术获取数据间存在的各种复杂关系。基于此,笔者对数据可视化与基于Web的数据可视化技术进行概述,分析了基于Web的数据可视化系统结构与设计流程,阐述了基于Web的数据可视化系统功能,详细论述了基于Web的数据可视化系统的存储机制。     

大数据可视化技术及应用探讨

伴随着我国经济高速的发展持续,科学技术突破也随之持续提升,大数据技术已经走入人民群众日常生活之中,并取得了积极的反响与效益成就。与此同时,大数据可视化技术得到了社会各界的重视,它将人机互动进行科学的融合,借助计算机高效的运转效率,帮助人们解决部分生活、工作中的难题。基于此,本文总结出大数据可视化相关概念,并提出了全新的应用方法,针对该技术未来发展形势进行了畅想。     

基于Web的大数据可视化系统

随着互联网技术的不断发展,各行业数据呈爆发式增长。为了使企业更加方便有效利用这些数据,数据可视化系统应运而生。但是,现有的数据可视化系统大部分针对特定场景开发,易用性差、学习曲线长、维护成本较高。笔者提出的基于Web的大数据可视化系统,具有灵活的交互方式,使用户在丰富图表类型的基础上,快速实现数据可视化,并支持本地CSV上传和JDBC数据源连接。该系统以组件化的方式进行开发,提高了开发效率和系统可维护性。     

生物多样性数据的Web可视化

生物多样性数据具有多源、异构、数据量大、信息冗杂不直观等特点,对其可视化可帮助科研工作者轻松直观深入的了解数据,发现知识,辅助其科学决策,具有重要的现实意义。可视化与具体的应用场景密切相关,本文针对三类具有不同类型和结构的生物多样性数据,利用HTML5技术开发了三种不同的Web可视化展示和分析方式,多视角、直观地展现了数据源及其内在规律,为领域科学家和保护区管理人员科学认识生物多样性数据提供了一种便利的手段。     

基于大数据技术的松花江哈尔滨段景观可视化研究与应用

目前大数据技术已经逐渐在各行各业中发挥出越来越重要的作用.本文针对松花江哈尔滨段实景信息,将大数据可视化技术与Web 2.0应用相结合,设计了一套可将松花江景观数据进行可视化处理的旅游信息系统,并利用线上用户交互系统进行相关实景信息的可视化展示.以松花江哈尔滨段实景旅游展示系统为背景,验证并解决了异构海量数据可视化的实...     

基于数据可视化技术平台的开发

现代数据处理越来越依赖于信息技术,然而缺乏相关的方法可用于分析大量数据可视化的问题,因此以系统数据可视化为目标,设计了数据可视化的技术平台,并且实现了其基本的应用功能,同时利用R语言与JavaWeb相结合的方式使其功能更加强大。该平台的实现具有一定的经济价值和积极现实意义。     

扶贫大数据可视化设计应用

扶贫系统数据的现状存在着上下级数据脱节、更新不及时、共享方式落后、数据来源单一等问题.通过大数据可视化系统建设,打破各部门数据壁垒,开发移动端扶贫管理应用,对扶贫对象、帮扶主体、帮扶措施、脱贫成效进行综合分析,为扶贫办的决策和评估提供数据依据,提高扶贫工作效率,达到"六个精准"要求.通过可视化技术解决精准扶贫中统计数据...     

基于Web的数据可视化技术初探

随着信息技术的不断发展,数据可视化技术不断受到了人们的关注。本文分析当前Web方式下几种流行的图形格式的优缺点,并结合开源项目JFreeChart和Batik,介绍了生成PNG以及SVG格式图形文件的实现方法。     

面向云计算的计算机数据可视化技术研究

互联网时代下,强有力的数据运算能力和加密技术是必要条件与有力保障.深入研究了数据可视化技术,从数据可视化理论概述入手,着重探讨基于Web的数据可视化技术和数据可视化的关键技术,在此基础上,探讨了面向云计算的大数据可视化技术的实施,旨在为该技术的更好应用提供参考.     

Web应用防火墙(WAF)技术的综述

Web应用的广泛扩展,使得传统的网络防护技术已经不能有效地应对来自应用层的各种攻击。随着服务提供商对Web应用的安全需求不断提升,Web应用防火墙(WAF)作为应用层防护工具开始备受关注。为了研究Web应用防火墙技术的发展现状,通过阅读大量文献,对Web应用防火墙技术进行总结和分析,提出了Web应用防火墙的发展新趋势。     

Web based visualization of large climate data sets

We have implemented the USGS National Climate Change Viewer (NCCV), which is an easy-to-use web application that displays future projections from global climate models over the United States at the state, county and watershed scales. We incorporate the NASA NEX-DCP30 statistically downscaled temperature and precipitation for 30 global climate models being used in the Fifth Assessment Report (AR5) of the Intergovernmental Panel on Climate Change (IPCC), and hydrologic variables we simulated using a simple water-balance model. Our application summarizes very large, complex data sets at scales relevant to resource managers and citizens and makes climate-change projection information accessible to users of varying skill levels. Tens of terabytes of high-resolution climate and water-balance data are distilled to compact binary format summary files that are used in the application. To alleviate slow response times under high loads, we developed a map caching technique that reduces the time it takes to generate maps by several orders of magnitude. The reduced access time scales to >500 concurrent users. We provide code examples that demonstrate key aspects of data processing, data exporting/importing and the caching technique used in the NCCV.     

富因特网应用程序在Web数据展现中的应用

根据传统的web数据展现技术在数据展现灵活性和交互性等方面的不足以及对新的Web数据展现应用的需求,提出了将富因特网应用程序(RIA)应用于Web数据展现的思路.结合一个在线曲线统计图的实际例子探讨了如何在MS.NET架构下使用微软下一代展现层技术Silverlight来实现具有丰富的交互、强大的展现层逻辑和良好用户体验的Web数据展现功能.     

基于大数据时代的数据可视化应用分析

如今随着数据采集、存储和数据分析技术飞速发展,大幅度降低了数据储存和处理的成本,我们即将步入一个大数据时代。大数据时代的改革将海量数据处理变为可能,而且大幅降低了处理成本,促使越来越多跨专业学科的人才投入到大数据的开发应用中来。如何才能让大型数据集变得简单和易于理解,可视化无疑是最有效的途径。对大数据背景下的数据可视化应用展开研究,将有助于我们发展和创新数据可视化技术。     

3DGIS中空间数据可视化的研究与应用

空间数据可视化是当前3DGIS领域的研究热点之一。提出了一种面向对象的空间数据可视化模型,基于金字塔模型来组织和调度DEM（数字高程模型）、DOM（数字正射影像）等栅格数据,并引入矢量数据参数化3D建模思想,实现了矢量地物数据的三维建模与可视化。在此基础上,借助虚拟现实技术,基于OpenGL实现了一个3DGIS原型系统,具备空间数据的真实感可视化表达、3D场景实时漫游、交互查询等功能。最后给出了基于该原型系统为军事与民用领域开发的应用实例。     

A Web Map Service implementation for the visualization of multidimensional gridded environmental data

We describe ncWMS, an implementation of the Open Geospatial Consortium's Web Map Service (WMS) specification for multidimensional gridded environmental data. ncWMS can read data in a large number of common scientific data formats – notably the NetCDF format with the Climate and Forecast conventions – then efficiently generate map imagery in thousands of different coordinate reference systems. It is designed to require minimal configuration from the system administrator and, when used in conjunction with a suitable client tool, provides end users with an interactive means for visualizing data without the need to download large files or interpret complex metadata. It is also used as a “bridging” tool providing interoperability between the environmental science community and users of geographic information systems. ncWMS implements a number of extensions to the WMS standard in order to fulfil some common scientific requirements, including the ability to generate plots representing timeseries and vertical sections. We discuss these extensions and their impact upon present and future interoperability. We discuss the conceptual mapping between the WMS data model and the data models used by gridded data formats, highlighting areas in which the mapping is incomplete or ambiguous. We discuss the architecture of the system and particular technical innovations of note, including the algorithms used for fast data reading and image generation. ncWMS has been widely adopted within the environmental data community and we discuss some of the ways in which the software is integrated within data infrastructures and portals.     

Web安全性测试技术综述

对Web应用程序进行有效彻底的测试是及早发现安全漏洞、提高Web应用安全质量的一种重要手段。首先介绍了Web应用安全威胁分类,总结了常见的Web应用安全漏洞;然后对当前Web安全性测试技术的研究进行了全面概述,比较了静态技术和动态技术各自的优缺点,同时对在Web安全性测试中新兴涌现的模糊测试技术进行了详细的介绍和总结;最后指出了Web安全测试中有待解决的问题以及未来的研究方向。     

时间序列数据可视化研究综述

时间序列数据可视化综合了时间序列数据挖掘、数据可视化、计算机图形学、计算机交互技术等学科的理论和方法。从时间和数据两个角度分析了时间序列数据的特征;从用户的角度探讨了时间序列数据可视化的主要任务;综述了时间序列数据可视化从以人为中心到以计算机为中心,再到人机交互方式的发展历程;详细介绍了时间序列数据可视化的5类图表和5类表达方式。最后,对时间序列数据可视化研究进行总结和展望。     

Leveraging user-session data to support Web application testing

Web applications are vital components of the global information infrastructure, and it is important to ensure their dependability. Many techniques and tools for validating Web applications have been created, but few of these have addressed the need to test Web application functionality and none have attempted to leverage data gathered in the operation of Web applications to assist with testing. In this paper, we present several techniques for using user session data gathered as users operate Web applications to help test those applications from a functional standpoint. We report results of an experiment comparing these new techniques to existing white-box techniques for creating test cases for Web applications, assessing both the adequacy of the generated test cases and their ability to detect faults on a point-of-sale Web application. Our results show that user session data can be used to produce test suites more effective overall than those produced by the white-box techniques considered; however, the faults detected by the two classes of techniques differ, suggesting that the techniques are complementary.     

Improving Web usability through visualization

One reason for poor Web site usability is researchers' lack of understanding about how users surf for information. Predictive Web usage visualizations can help analysts uncover traffic patterns and usability problems. The author describes some of the techniques those in the User Interface Research Group at PARC have developed to visualize content changes, linkage structures, site usage, and so on. He explores how these techniques can be used to identify specific usability problems at large Web sites. As part of his work, he have created a predictive visualization model called Information Scent, in which simulated users help uncover patterns and deficiencies in information accessibility. He demonstrates these techniques using a prototype system called ScentViz to illustrate how Web usage analysis can be enhanced using visualization methods