利用LiDAR成果生产数字线划图的简易方法

提出一种利用LiDAR成果生产数字线划图的简易方法,实现了大比例尺地形图的快速更新与维护.     

基于XML的AutoCAD图形与SVG图形转换研究

SVG是W3C支持的最新网络图形图像标准.文章介绍和分析了AutoCAD的图形数据库以及它的对象结构模型,介绍了SVG的特点及其文档对象模型.基于上述分析,建立两者之间的对象元素映射关系.最后,我们根据这一映射关系给出一个应用实例,实例证明了通过给出的映射关系可以实现将AutoCAD图形(二维)转换为SVG图形.     

基于DOM的XML解析技术在构件描述中的应用

在Visual C#中,解析器可将代码中的扩展标记语言(eXtensible Markup Language,XML)注释处理为外部XML文档。文档对象模型(Document Object Model,DOM)定义了一个独立于平台和语言的标准接口,应用程序通过它访问和修改XML文档数据。介绍了DOM的特点和功能,并在ASP.NET平台下通过封装的DOM类库解析和存取XML文档,完成了对XML文档数据提取,将解析出的数据导入数据库作为构件描述信息的应用实例。     

Photosensitized degradation of amoxicillin in natural organic matter isolate solutions

Amoxicillin is a widely used antibiotic and has been detected in natural waters. Its environmental fate is in part determined by hydrolysis, and, direct and indirect photolysis. The hydrolysis rate in distilled water and water to which five different isolated of dissolved organic matter (DOM) was added, were evaluated. In the five different DOM solutions hydrolysis accounted for 5-18% loss of amoxicillin. Direct and indirect photolysis rates were determined using a solar simulator and it appeared that indirect photolysis was the dominant loss mechanism. Direct photolysis, in a solar simulator, accounted for 6-21% loss of amoxicillin in the simulated natural waters. The steady-state concentrations of singlet oxygen, ¹ΔO₂ (∼10⁻¹³ M) and hydroxyl radical, •OH (∼10⁻¹⁷ M) were obtained in aqueous solutions of five different dissolved organic matter samples using a solar simulator. The bimolecular reaction rate constant of ¹ΔO₂ with amoxicillin was measured in the different solutions, kΔO₂ = 1.44 × 10⁴ M⁻¹ s⁻¹. The sunlight mediated amoxicillin loss rate with ¹ΔO₂ (∼10⁻⁹ s⁻¹), and with •OH (∼10⁻⁷ s⁻¹), were also determined for the different samples of DOM. While ¹ΔO₂ only accounted for 0.03-0.08% of the total loss rate, the hydroxyl radical contributed 10-22%. It appears that the direct reaction of singlet and triplet excited state DOM (³DOM^∗) with amoxicillin accounts for 48-74% of the loss of amoxicillin. Furthermore, the pseudo first-order photodegradation rate showed a positive correlation with the sorption of amoxicillin to DOM, which further supported the assumption that excited state DOM^∗ plays a key role in the photochemical transformation of amoxicillin in natural waters. This is the first study to report the relative contribution of all five processes to the fate of amoxicillin in aqueous solution.     

基于XML的数据库查询体系设计

该文从该问题出发,提出了把数据库表变换为XML文档实施数据的查询这一解决思路。该文首先对SAX、DOM、XPath 3种实现XML查询技术的原理进行了分析,阐述了3种技术的优缺点及适用范围,提出了把XPath与DOM相结合的一种灵活简单的XML查询方案,并且构建了XML查询应用模型。     

无人机倾斜摄影中多视角影像在矿山监测中的对比分析及应用研究

为解决无人机倾斜摄影中多视角影像面向不同矿山监测需求的应用问题,本文基于垂直摄影和倾斜摄影的特点和倾斜摄影关键技术,通过五镜头无人机倾斜摄影测量系统中垂直影像和五镜头影像两种数据生产三维模型、Digital Orthophoto Map(DOM)、Digital Surface Model(DSM)成果的实验,详细分析了其成果在几何精度、表征质量、生产效率等方面的差别,提出了两种影像在矿山遥感监测中面向不同需求的最佳应用方案。结果表明,从高效、实用的角度来看,当用于监测矿山开采秩序,及时发现违法开采线索时,应首选采用垂直影像生产模式;当用于矿产资源规划,获取客观基础数据时,可优先采用五镜头影像生产模式。通过实验分析,总结出了不同应用方案,具有良好的实用价值。     

利用Treeview组件创建和显示XML文档

XML（Extensible Markup Language)文档具有嵌套层次结构的特点，把它装入到DOM对象后形成一棵DOM树，而Treeview非常适合表现树状结构，从以上特点出发，介绍了利用Treeview来创建和显示XML文档的一种方法，并举例具体说明。     

Automating Content Extraction of HTML Documents

Web pages often contain clutter (such as unnecessary images and extraneous links) around the body of an article that distracts a user from actual content. Extraction of useful and relevant content from web pages has many applications, including cell phone and PDA browsing, speech rendering for the visually impaired, and text summarization. Most approaches to making content more readable involve changing font size or removing HTML and data components such as images, which takes away from a webpages inherent look and feel. Unlike Content Reformatting, which aims to reproduce the entire webpage in a more convenient form, our solution directly addresses Content Extraction. We have developed a framework that employs an easily extensible set of techniques. It incorporates advantages of previous work on content extraction. Our key insight is to work with DOM trees, a W3C specified interface that allows programs to dynamically access document structure, rather than with raw HTML markup. We have implemented our approach in a publicly available Web proxy to extract content from HTML web pages. This proxy can be used both centrally, administered for groups of users, as well as by individuals for personal browsers. We have also, after receiving feedback from users about the proxy, created a revised version with improved performance and accessibility in mind.     

基于DOM的XML解析与应用

随着XML的广泛应用,大量的信息都将通过XML文档来进行存储、交换,因此熟悉和掌握一种解析XML文档的方法是很重要的.着重介绍基于DOM的XML解析的特点、实现和在数据存储方面的应用,对推广应用XML和DOM技术有一定的实用意义.     

基于DOM的数据转换技术及案例研究

着重介绍用DOM解析XML文件,并在浏览器中呈现其解析结果.之后具体描述一个电子商务典型案例,即用DOM解析XML商品信息文件并对其修改,然后用XML样式表语言模板XSLT(XML Stylesheet Language Template)将其呈现在浏览器中,同时给出关键代码.该文可以使DOM程序员能够对使用DOM处理XML文件的方法有一个直观的认识,并能够深入了解DOM各接口的使用方法,从而为更深一步学习DOM在其他领域的应用打下基础.