机助制图中缓和曲线绘制方法探讨

在精度要求较高的设计、规划中，绘制缓和曲线时，简单地用短的直线段代替缓和曲线会给后续计算带来影响，特别是在数字化设计图上直接采集坐标和进行里程计算会产生偏差，用不同半径和弧长的圆弧来模拟缓和曲线可以解决这一问题。     

基于ArcView的专题地图的制作

本文探讨了在ArcView环境下专题地图的制作工艺方法和ArcView在制图中的相关应用。     

2003年国际测绘会议消息(二)

7月 17～ 19日 ,在马来西亚吉隆坡召开 2 0 0 3年亚洲制图大会。会议主题为 :GPS ,制图程序 ,基于定位服务 ,运输与高效管理以及其他相关主题。主办单位 :马来西亚KualaLumpur。 (联系地址 :E mail:info @mapasia .org ;http :/ /www .mapasia .org)7月 2 1～ 2 5日 ,在法国图卢兹 ,召开IGARSS 2 0 0 3大会。以地球科学与遥感为主题。在七个国际学术机构中和组织中选定了 14 9个专题。如 :讨论地球形状与色彩学 ;遥感应用 ;地球科学的任务和规划 ;地理科学模型和数据处理 ;数据处理与运算 ;电磁波选题 ;仪器的使用和技术 ;政策与社会议…     

Researches on Cartographic Database-Based Interactive Three-Dimensional Topographic Map

With the development of computer graphics, the three-dimensional (3D) visualization brings new technological revolution to the traditional cartography. Therefore, the topographic 3D-map emerges to adapt to this technological revolution, and the applications of topographic 3D-map are spread rapidly to other relevant fields due to its incomparable advantage. The researches on digital map and the construction of map database offer strong technical support and abundant data source for this new technology, so the research and development of topographic 3D-map will receive greater concern. The basic data of the topographic 3D-map are rooted mainly in digital map and its basic model is derived from digital elevation model (DEM) and 3D-models of other DEM-based geographic features. In view of the potential enormous data and the complexity of geographic features, the dynamic representation of geographic information becomes the focus of the research of topographic 3D-map and also the prerequisite condition of 3D query and analysis. In addition to the equipment of hardware that are restraining, to a certain extent, the 3D representation, the data organization structure of geographic information will be the core problem of research on 3D-map. Level of detail (LOD). space partitioning, dynamic object loading (DOL) and object culling are core technologies of the dynamic 3D representation. The objectselection, attribute-query and model-editing are important functions and interaction tools for users with 3D-maps provided by topographic 3D-map system, all of which are based on the data structure of the 3D-model. This paper discusses the basic theories, concepts and cardinal principles of topographic 3I)-map,expounds the basic way to organize the scene hierarchy of topographic 3D-map based on the node mechanism and studies the dynamic representation technologies of topographic 3D-map based on LOD, space partitioning, DOL and object culling. Moreover. such interactive operation functions are explored, in this paper, as spatial query, scene editing and management of topographic 3D-map. Finally, this paper describes briefly the applications of topographic 3D-map in its related fields.     

PSP和TSP在数字制图系统开发中的运用

简要介绍了数字地图制图系统，结合在开发一个应用软件系统时所要面临的一些实际问题和困难，引入了软件工程思想中改进软件开发方式的个体软件过程(PSP)和群组软件过程(TSP)。     

浅谈1∶5000地形图数字化缩编的体会

本介绍了地形图数字化缩编的几个原则，以1∶1000栅格地形图为基础图，利用MicroStafion平台二次开发软件，进行1∶5000地形图数字化缩编。取得了一些经验，提高了数字化成图的效率。     

基础地理数据的入库和应用

本通过对建立“空间数据库”的一些体会和认识，探讨了基础地理数据入库技术路线，并进行了分析，提出了一些亟待解决的问题。     

环境保护系列地图集的选题与设计

环境保护系列地图集是依据制图综合理论和统一的地图设计原则，从编图资料、地理底图、内容表示及可视化等方面着手，形成一套具有科学性和系统性的规范化系列地图集，服务于环境保护科学研究。环境保护系列地圈集从内容和成图方法来看，反映了现代地图向综合制图、动态制图和数字制图方向发展的特点。