【作者】 郑虹晖；

【导师】 阳国贵；

【作者基本信息】 国防科学技术大学 ， 计算机科学技术， 2010， 硕士

【摘要】 开发一个完整的自动气象站数据图形查询系统,涉及到大量的工作,如气象资料的质量控制、地理信息系统的应用等,本文对系统设计过程中遇到的几个关键问题进行了研究,并提出了解决的办法。1)从介绍空间变异理论相关概念着手,引出了克里金等7种空间插值法。经过大量的统计和比较,筛选出空间质量控制的最优模型--时间协同克里金(CKT)。据初步检索,该模型在实时气象资料质量控制领域的应用尚属首次。最后利用各种质量控制方法,设计和实现了自动气象站资料质量控制软件。2)Surfer控件支持分布式组件对象模型(DCOM )技术,激活其DCOM特性后,就可以通过web调用Surfer控件绘制等值线/色斑图。提出Surfer生成等值线图形文件的命名规则及程序算法,避免重复检索数据库和生成图片,加快了图像显示的速度,同时也避免了因大量用户并行访问可能引起的写文件冲突,最终解决了web远程调用Surfer控件的问题。负载测试结果表明,利用该算法,页面绘制等值图的速度提高一倍左右。3)研究地球坐标系和地图投影,深入分析Google map地图算法,发现Google map图块URL的最新格式,并编写了相应的下载指定区域图块的验证程序,为今后实现离线系统打下基础,降低了系统完全依赖Google地图的风险。找到了Google地图产生偏移的原因,提出了一种简便、实用的坐标系纠偏方法。经实际测算,纠偏后的自动气象站坐标定位与WGS-84坐标系统相比,平均误差只有30米左右。4)与surfer绘制等值线绘制技术相结合,实现了等值线、雷达回波图形与Google map地图的叠加。实现了任意两个自动气象站之间的行车路线查询和显示,方便了自动气象站的维护。5)设计与开发了完整的自动气象站数据图形化查询系统,并投入业务应用。经负载测试,该系统的性能完全能满足目前的业务需求。更多还原

【Abstract】 The development of an entire graphic query system for data from Automatic Weather Stations (AWS) is associated with a lot of work, such as the quality control of meteorological data, the applications of GIS, etc. In this paper, several key issues have been disscued during the design of the abovementioned system, and also the sulotions of the issues have been put forward.1. Beginning with the presentation of the conceptual spatiail variogram theories, 7 spatial interpolations have been introduced.After a large amount of data statistics and comparisions,The Time CoKriging was selected as the best model of spatial quality control. And according to the initial documents retrieving, we are the first to apply this model in the fields of quality control for meteorological data. Finally, the quality control software for data from ASW was designed and implemented.2. Surfer Automation supports Distribution Component Object Mode(lDCOM),by activating which, Surfer ActiveX will be called to draw contour on web pages. A rule of naming the contour graphical files and the algorithm of building the abovementioned files are discussed, with which, the repeatedly search of database and generation of images are avoided so that the speed of image display increases, and simultaneously, the write violation, which is probably caused by mass parallel access, is avoided. Eventually, the problem of calling Surfer ActiveX is resolved. The load test indicates that the speed of drawing contour on web pages by using the algorithm is increased by twice as much.3. By studying the earth coordinate system and deeply analyzing the algorithm of Google Map, the recent URL format of the Google Map tiles is discovered and the verified program is coded to download the tile files of the specified area. With these files, a tiling map server can be made in the future so as to lower the risk of depending on Google Maps totally. At the same time, the reason causing the offset of Google Map China is found, and a simple and pragmatic method of correcting the offset of the coordinate system is put forward. The actual measurement shows that the average distance between coordinate system corrected and WGS-84 is less than 30 meters.4. In combination with the techniques of drawing contour with surfer, the contour and images of radar can be overlaid to Google Map. And also, the driving route between any two automatic weather stations is calculated in order to make the maintenance more easily. 5. The Graphic Query System of data from Hainan Automatic Weather Stations has been designed and developed. The load test result shows that the performance of the system can meet the requirement of the current business.更多还原