摘要
针对数字地图制图环境下采用平行线法确定面状要素名称注记定位线的局限性,在分析其产生原因的基础上,提出化简多边形图形的一种新模型———歧点删除法原型,并结合面状要素名称注记配置规则和软多边形与硬多边形图形特征,对歧点删除法原型做出了新的改进,提出了用平行线法确定软多边形与硬多边形名称注记定位线时,化简多边形的两种改进性歧点删除法,分别命名为面向软多边形名称注记配置化简图形歧点删除法与面向硬多边形名称注记配置化简图形歧点删除法,其中最为关键的思想为对多边形从3个旋转方位连续实施4次图形综合,并提出第一旋转角、第二旋转角两个概念,打破了平行线法的局限性,使所获取的注记定位线与地图制图专业人员人工确定结果相一致,达到了用简单方法解决自动化地图注记配置难题的效果。大量实验结果及理论分析表明,该方法数学逻辑严密、实施简单,对数字地图制图环境下"地图注记自动配置"有理论与技术指导意义。
Aiming at limitations of the parallel line method which is used to postioning the notations name for area features the paper proposed a method called as removing unmonotonic convex vertex prototype(RUCVP) used for simplifing a polygon,moreover,combining with cartographic name placement rules for area features and taking the figure features of soft polygon and hard polygon into account,it made creative improvements for RUCVP,at last,the author proposed two methods,respectively named as removing immonotonic convex vertex for soft polygon name polyline determination(RUMCVSPNP) and as removing immonotonic convex vertex for hard polygon name polyline determination(RUMCVHPNP).Based on the improved methods among which the most important ideas were four times simplifications to polygon from three rotated positions and two concepts which were the first rotating angle and the second rotating angle ,the article has broken all kinds of limitations of the parallel lines method,constructed the advantage that highly identified the name positional polyline determined for area features by the article method with ones by cartographers,used a simple method but reached effect to resolve a question among a international hard problem-automatic cartographic name placement. A great deal of experiment and analysis in theory have showed that the method is of tightness in mathematical logic, simplicity in implement, universality in utilization, and has guiding significance to automatic name placement of digitally mapping platform.
出处
《地球科学与环境学报》
CAS
2004年第2期75-80,共6页
Journal of Earth Sciences and Environment
基金
国土资源部九五重点攻关项目(960600104)
关键词
单调多边形
软多边形
硬多边形
歧点
地图注记配置
面状要素
monotonic polygon
soft polygon
hard polygon
immonotonic convex vertex
cartographic name placement
