Positional accuracy, positional uncertainty, and feature change detection in historical maps: Results of an experiment

The measurement and management of positional accuracy and positional uncertainty is especially problematic in historical cartography and Historical GIS applications, for at least two reasons: first, historical sources, and especially historical maps, generally carry a higher degree of positional inaccuracy and uncertainty compared to contemporary geographic databases; second, it is always difficult and often impossible to reliably measure the positional accuracy and positional uncertainty of the spatial attribute of historical data. As an added complication, the terms “inaccuracy” and “uncertainty” are often used as synonyms in the literature, with relatively little attention given to issues of uncertainty.In this article we propose a methodology for detecting the positional inaccuracy and positional uncertainty of measurements of urban change using historical maps at a very high spatial resolution (the building). A widely accepted and routinely employed method for detecting urban change, and spatial change in general, consists in overlaying two or more maps created at different dates, but the technique can lead to the formation of spurious changes—typically, sliver polygons—that are the product of misclassification error or map misalignment rather than actual modifications in land cover. In this paper we develop an algorithm to detect such spurious changes. More in general, we extend the discussion to examine the effects of positional uncertainty and positional inaccuracy in feature change detection analysis. The case-study is the city of Milan, Italy.     

可视化Java类装载器的分析与实现

在总结程序设计可视化特点的基础上,提出提供开发过程中各种动态视图的可视化软件开发环境（vSDE）.鉴于装载器是Java编译器和虚拟机中的交叉模块,选取可视化Java类装载器（VJL）作为VSDE的预研.VJL提供在启动装载阶段和解析阶段中,一组装载相关类型的装载过程以及涉及信息的动态视图.VJL中的线程通信的模式以及通用图形模块的思想,可以应用于VSDE后续模块的开发.最后给出运行实例,演示VJL在不同阶段所提供的动态视图.     

容栅技术的电子树皮测量仪的设计与精度分析

树皮厚度能够预测病虫危害、林木生长和遗传变异,是一个极其重要的参数.在对树皮厚度的自动测量技术进行研究的基础上,设计了一套“容栅式”树皮厚度测量仪.通过对马占相思、非洲楝、面包树的树皮厚度测量试验,得到相应的标准偏差、变异系数,且效率提高了17 ～19倍.研究结果表明,该电子树皮测量仪具有精密度高、稳定性好、效率高的特点,其将在我国生态仪器中树皮厚度测量领域起着开拓作用.     

Analysis and synthesis of signal classification systems by perturbing pseudoinverse and projection operations

The paper considers the synthesis of signal classification systems using the theory of perturbation of pseudoreverse and projection matrices and proposes an algorithm to select (filter) separable subsets on a finite point set from R ⁿ . Translated from Kibernetika i Sistemnyi Analiz, No. 4, pp. 124–134, July–August 2009.     

基于信息增益和相关性的贝叶斯分类算法研究

朴素贝叶斯分类以统计学理论为基础,所以具有一定的精确度,但它没有考虑属性间是否相互独立以及空缺值。信息增益（IG,Information Gain）是有效的特征选择方法,它提供了在分类系统中,某个属性能否在分类时带来有用信息。属性间的相关性分析可以说明在分析时是否要把它们都考虑进去,通过这样的分析可以去除不必要的信息。把信息增益和属性相关性相结合,可以改进朴素贝叶斯分类的局限性,从而在精度上对其进行改进。     

远程公网电话报警信息图文自动联动传输系统的设计与实现

本文针对国内大中型城市特服系统设计中的缺陷,提出设计中的新方法：采用远程查号的方法,与电信信息中心大型ＳＹＢＡＳＥ关系数据库远程联网;     

铸坯定尺精确性的影响因素分析和改进

通过莱钢采用过各种定尺测量系统的优缺点,介绍了莱钢自主设计的测量辊定尺系统,分析了影响定尺精度的主要影响因素,并针对这些不利的因素采取相应的对策和改进措施,保证了较高的产品成材率。     

干涉检测算法的检测速度与精度的系统分析

在实时运动干涉检测系统中,干涉检测的效率与精度是问题的关键。文章对影响干涉检测准确度、检测速度以及分阶段干涉检测效果的因素进行了分析,提出了影响基本干涉检测费用的各种因素,并对各因素的复杂性进行了参数化定义,同时从干涉检测的效用、确定性等方面对检测效果进行了估计。在以上基础上提出了基于模糊逻辑的运动抽象精度的匹配方法,实现了对各种干涉检测效率与精度的合理搭配与调节。经验证,该文算法较等误差法效率高出10倍以上。     

MOSAICA: A web-2.0 based system for the preservation and presentation of cultural heritage

The question of how to present cultural heritage resources in a way that attracts potential users is becoming important in our ever-changing world. This paper describes MOSAICA system – a web 2.0-based toolbox, dedicated for the preservation and presentation of cultural heritage. This paper also describes an evaluation study that examined MOSAICA system’s usability and social impact. Online questionnaires and semi-structured interviews were administered among users from Israel, France, and Poland. Findings indicated positive views related to MOSAICA’s usage in terms of knowledge gain, ease of use, and attractiveness. Findings also indicated that learning about the stories, customs, and traditions of diverse cultures, via hypertext narratives, may enhance positive dispositions toward open-mindedness, in general, and non-judgmental views, in specific. MOSAICA system provides a generic framework for users, of any culture and religion, to actively engage in preserving their heritage via activities such as investigation, exploration, and storytelling.     

The Latent Variable Data Model for Exploratory Data Analysis and Visualisation: A Generalisation of the Nonlinear Infomax Algorithm

This paper presents a generalisation of the nonlinear 'Infomax' algorithm based on the linear latent variable model of factor analysis. The algorithm is based on an information theoretic index for projection pursuit which defines linear projections of observed data onto subspaces of lower dimension. This is applied to the visualisation and interpretation of complex high dimensional data and is empirically compared with the recently developed Generative Topographic Mapping.