The Potential of Maps APIs for Internet GIS Applications

Since the launching of Maps Application Programming Interfaces (APIs) in 2005, many web developers, including geographers and non‐geographers, applauded the freely adaptable tools and used them to spawn numerous Internet applications. The success of the Maps APIs is largely attributable to its no‐cost policy, the availability of global data coverage, dynamic navigation, query capability, and ease of implementation. Despite its versatility in dynamic exploration of geographic data online, the existing Maps APIs lack Geographic Information System (GIS) functionalities compared to other Internet Mapping Services. The goal of this research was to review the potential of the Maps APIs for Internet GIS applications. This research employed the Google Maps API and developed a web prototype that disseminates spatial information of urban sprawl in Mundy Township, Michigan. The results revealed that both vector and raster data could be effectively represented by using the Maps API. Moreover, the Geographic Markup Language (GML) approach illustrated great potential for developing Internet GIS solutions around open specifications. This research suggested several potential solutions to expand the spectrum of GIS operations of the Maps APIs by incorporating the XML‐related technology and extending the JavaScript library.     

DAS24-3B数据采集系统采集控制模块的工作原理

DAS24-3B是中国科学院地质与地球物理研究所研制的宽频带地震数据采集系统。采集控制模块是该系统的重要组成部分。本文阐述了控制模块的工作原理，介绍了DAS24-3B系统的基本组成和采集器工作过程，并给出该系统如何与笔记本端应用程序界面通讯和联络的操作建议，使该系统能够在工作中发挥更大的作用。     

基于Google Map API的电信基站信息管理系统研究

介绍基于Google Map API开发电信基站信息管理系统的方法。该方法利用Google Map提供的应用程序开发接口,以B/S方式灵活地实现了电信基站位置漫游,基站信息的维护和表现等功能。     

基于Android终端的GIS林业数据采集系统设计

在野外利用智能终端设备采集数据可以保证获取资料的便利性与准确性。针对林业数据的数量庞大、科目多样、分布区域广泛等特点,本系统基于现有的Android平台结合百度地图API及定位SDK组件调用进行二次开发,实现地图接入、位置定位、路线搜索等服务,通过相关命令调用终端拍照等应用在数据库中实现数据采集、属性记录及导出功能,系统主要包括登录模块、采集模块、数据管理模块等。本文设计的Android终端GIS采集数据系统可以满足外业人员对林业数据的核查、修改与采集需求,为野外核查工作提供了新的模式和方法。     

Practical kinetic modeling of petroleum generation and expulsion

Models for petroleum generation used by the industry are often limited by (a) sub-optimal laboratory pyrolysis methods for studying hydrocarbon generation, (b) over-simple models of petroleum generation, (c) inappropriate mathematical methods to derive kinetic parameters by fitting laboratory data, (d) primitive models of primary migration/expulsion and its coupling with petroleum generation, and (e) insufficient use of subsurface data to constrain the models. Problems (a), (b) and (c) lead to forced compensation effects between the activation energies and frequency factors of reaction kinetics that are wholly artificial, and which yield poor extrapolations to geological conditions. Simple switch or adsorption models of expulsion are insufficient to describe the residence time of species in source rocks. Yet, the residence time controls the thermal stresses to which the species are subjected for cracking to lighter species.     

基于Auto CAD.NET API的DWG文件坐标变换的研究及实现

针对工程实践中不同坐标系下DWG数据相互变换的实际需要,通过对DWG数据存储组织结构以及AutoCAD.NET API的深入研究,采用平面四参数转换方法,基于Visual Studio 2010和AutoCAD 2008开发平台,成功开发了DWG数据坐标变换程序。以沈阳市1∶500比例尺、1954北京坐标系的DWG数据为例,实现了不同坐标系下DWG数据的互相变换,并对变换后的数据进行了要素检查和精度分析。结果证明,采用基于AutoCAD.NET API二次开发的技术能够很好地满足DWG数据在不同坐标系下互相变换的应用需求,大大地节省了工作时间,提高了工作效率。     

VC++6.0环境下GPS接收机串口通信的实现

首先简单介绍了GPS接收机串口通信的基本概念，然后通过实例详细介绍了计算机与GPS接收机进行数据传输的两种方法：一种是使用Win32 API通信函数的文件读写方式；另一种是通过VC^ 6.0提供的MSComm控件实现。     

基于Google API的地震信息地图发布系统

Google Map及相关工具功能强大,是可二次开发的地理信息平台。介绍运用Google MapAPI技术,实现动态实时更新的地震信息发布系统,并简单应用。     

厦门空气污染指数与地面气象要素的关系分析

利用相关统计法分析2006—2008年厦门市地面气象要素对空气污染指数变化的影响规律。结果表明：风速、气温、降水、相对湿度和水汽压对空气污染指数有显著负效应作用,气压起显著正效应作用;风向影响较为复杂, NNW-N-E-ESE风起正效应作用, SE-S-W风起负效应作用,厦门风向总体不利于空气质量提高,全年仅夏季盛行SE-S-W风。API指数与风向、气温、降水、气压、相对湿度和水汽压的季节变化规律有高相关性。API指数与气象要素中的水汽压关系最相关,其次是气压。     

基于Google Earth API的典型GIS功能开发方法

探讨了基于Google Earth API开发部分典型GIS功能的方法,并进行了原型系统开发。该方法在原始Google Earth API基础上扩展实现了几何查询、地图要素的创建和编辑、矢量栅格数据浏览等典型GIS功能,能够满足用户对地图数据的操作需求,用户体验良好。