【作者】 雷明军；

【导师】 杜清运；

【作者基本信息】 武汉大学 ， 地图学与地理信息系统， 2005， 硕士

【摘要】 地图注记自动配置是一项智能化行为,根据从数据库中读取的地图要素的名称、字大、字体、坐标等参数,按照注记配置原则,由计算机模拟人工注记的过程,自动地计算出合乎要求的注记配置位置,以期待能够达到或接近地图制图专业人员人工配置所能达到的效果。 线状要素是地图和地理信息系统中的一类重要的要素,空间信息中有许多线状要素,且线状要素的图形相对比较复杂。在地图自动注记的研究中,线状要素注记配置的研究占有重要地位,且难度和灵活性较大。目前,国内外对线状要素注记自动配置的研究相对较少。 本文首先对地图线状要素注记自动配置的国内外研究现状进行了分析和比较,总结了线状要素注记的配置规则;然后阐述了自动注记配置的数据组织与结构,并分析了影响注记质量的基本因素;之后,提出基于贪婪算法的线状要素候选注记生成模型,并提出一个考虑注记的冲突、压盖和曲线特征适应性的注记质量评价模型,分别从注记的冲突、压盖、位置优越性、单调性和通视性等方面对注记质量进行评价分析;最后对所做的工作进行实验和分析,并对线状要素的发展前景进行了展望。更多还原

【Abstract】 Automatic map labeling is an intelligent action, which uses the names, font sizes, font styles, coordinates of map objects and the rules of map labeling to calculate the proper location. It’s simulates the process of manual work and expects to obtain the effect that is as good as the cartographic professional’s manual work.Linear features are the important element of map and GIS. There are many linear features in spatial information, and the figures of linear features are very complex. The linear feature’s map labeling researches take an important position in the researches on automatic map labeling, which is difficult and flexible. At present, there are relatively fewer researches on linear features.Firstly, the author analyzes and compares the situation of the linear feature’s automatic map labeling researches, then summarizes the rules of linear feature’s automatic map labeling. Secondly, the author explains the data structures of automatic map labeling and analyzes the basic factors which influence label’s quality. Thirdly, the author proposes a linear feature’s labeling model which based on greedy search. And then put forwards a label quality evaluate model, which considers label’s clash and the shape of linear features. It’s from several aspects which include label’s clash, overlay, position level, monotonic segment and visual range to evaluate label’s quality. Lastly, the author gives the experiments on linear features, analyses of the result and the outlook of linear feature’s automatic map labeling.更多还原