ComGIS出接口扩展功能设计与应用

GIS技术发展掀起了组件化的热潮。但是开发人员当面临 GIS组件实现不了的功能时 ,往往出现难题。这时就可以通过 GIS组件中定义的出接口扩展它的功能 ,完成一些组件 GIS本身不具有的功能。本文探讨了出接口扩展 Com GIS的设计原则 ,并以实例揭示了这一方法如何运用以及它的运行机制 ,并且说明了如何在开发组件式GIS时添加出接口这一功能 ,最后揭示这一机制的发展方向。     

混合编程实现电视气象节目中图表的快速处理

随着经济社会的发展,公众对气象信息的需求趋于精细化。通过对电视气象节目中图表要求的分析,介绍了在Windows环境下通过VB编程对气象数据进行处理、分析,以ActiveX的方式调用Matlab、Photoshop等绘图软件二次处理加工,实现气象图表快速生成的思路和方法。利用不同软件的优势和接口技术混合编程可以提升高质量气象图表绘制的自动化程度,使大量气象数据和统计分析结果快速可视化,并通过媒体及时向社会发布,满足公众需求。     

气象行政许可法律文书自动化制作捷径

通过运用EXCEL作为用户界面和数据库,使用WORD做法律文书模板,应用WORD的邮件合并功能,结合WORD的域设计,实现了气象行政许可法律文书自动化制作捷径,为提高气象工作办公效率提供了一种参考。     

Automated road markings extraction from mobile laser scanning data

Road markings are used to provide guidance and instruction to road users for safe and comfortable driving. Enabling rapid, cost-effective and comprehensive approaches to the maintenance of route networks can be greatly improved with detailed information about location, dimension and condition of road markings. Mobile Laser Scanning (MLS) systems provide new opportunities in terms of collecting and processing this information. Laser scanning systems enable multiple attributes of the illuminated target to be recorded including intensity data. The recorded intensity data can be used to distinguish the road markings from other road surface elements due to their higher retro-reflective property. In this paper, we present an automated algorithm for extracting road markings from MLS data. We describe a robust and automated way of applying a range dependent thresholding function to the intensity values to extract road markings. We make novel use of binary morphological operations and generic knowledge of the dimensions of road markings to complete their shapes and remove other road surface elements introduced through the use of thresholding. We present a detailed analysis of the most applicable values required for the input parameters involved in our algorithm. We tested our algorithm on different road sections consisting of multiple distinct types of road markings. The successful extraction of these road markings demonstrates the effectiveness of our algorithm.     

Automatic representation and reconstruction of DBM from LiDAR data using Recursive Minimum Bounding Rectangle

Three-dimensional building models are important for various applications, such as disaster management and urban planning. The development of laser scanning sensor technologies has resulted in many different approaches for efficient building model generation using LiDAR data. Despite this effort, generation of these models lacks economical and reliable techniques that fully exploit the advantage of LiDAR data. Therefore, this research aims to develop a framework for fully-automated building model generation by integrating data-driven and model-driven methods using LiDAR datasets.The building model generation starts by employing LiDAR data for building detection and approximate boundary determination. The generated building boundaries are then integrated into a model-based processing strategy because LiDAR derived planes show irregular boundaries due to the nature of LiDAR point acquisition. The focus of the research is generating models for the buildings with right-angled-corners, which can be described with a collection of rectangles under the assumption that the majority of the buildings in urban areas belong to this category. Therefore, by applying the Minimum Bounding Rectangle (MBR) algorithm recursively, the LiDAR boundaries are decomposed into sets of rectangles for further processing. At the same time, the quality of the MBRs is examined to verify that the buildings, from which the boundaries are generated, are buildings with right-angled-corners. The parameters that define the model primitives are adjusted through a model-based boundary fitting procedure using LiDAR boundaries. The level of details in the final Digital Building Model is based on the number of recursions during the MBR processing, which in turn are determined by the LiDAR point density. The model-based boundary fitting improves the quality of the generated boundaries and as seen in experimental results, the quality depends on the average LiDAR point spacing. This research thus develops an approach which not only automates the building model generation, but also achieves the best accuracy of the model while utilizing only LiDAR data.     

地面报表预审流程优化的探讨

根据自动站微机审核特点,结合人工预审经验,对地面报表预审流程进行了优化探讨.     

预审单轨自动站地面气象记录月报表的方法

预审员对气象记录月报表进行预审,是报表出站前的最后一道关口,对提高气象资料的准确性有着重要的意义。     

武警作战指挥自动化保障系统的设计与实现

介绍了“武警作战指挥自动化保障系统”的基本构成，主要包括：像素地形图处理、矢量图处理、自动化标图和略图处理。介绍了各子系统中的基本功能，并对一些技术难点进行了原理性阐述。     

基于网络的多媒体天文教学课件的设计

结合网络技术的发展 ,利用网络的优越性 ,综合ActiveX技术 ,实现多媒体天文教学课件的网络化设计。