The Optimal Configuration Algorithm And Realization Of Area Features Annotations Overlap In Digital Map

Annotations are description and interpretation of surface features, which is to add map symbols. Statistic shows that in traditional cartography, artificial configuration of annotation takes up more than 50% both of the time and energy during the map production process, and this phenomenon has severely affected the efficiency of map production. Allocate the annotation automatically with computer can save plenty of time and energy for map make。At present, scholars from home and abroad study little about the Automatic Placement for Noting Area Feature, especially for digital annotation configuration, there's little related document at all. This paper will improve shortages of existing methods and study mainly about digital annotation configuration method.This paper aims at studying the question of digital annotations overlap of MAPGIS of the domestic mainstream software GIS, and will do a research on the following aspects about configuration of annotation:(1)Summarize the development status and current situation of annotation configuration from home and abroad hardly, and analyze the latest development tendency of annotation configuration.(2)Study fundamental speculative knowledge annotation, based on fundamental principle of annotation automatic configuration, summarize the Automatic Placement Rules for Noting Area Feature(3)Study the midpoint of the level cutting line algorithm and the longest cutting line algorithm, as well as some problems about these two methods carefully.(4)Based on studies about existing methods'defects, I've put forward the modified the midpoint of the level cutting line algorithm.(5)This paper has selected the database from The Wuling Yuan District of Zhangjiajie as the experimental data, use the data from database founded in the MAPGIS, discussed classifiedlly about Regular Area Feature's overlapping notes and Irregular Area Feature's overlapping notes of experimental area. I allocate Regular Area Feature's overlapping notes of experimental area again by collocation means of Regular Area Feature notes(the mean this paper has brought up), and achieve experimental results. I've allocated problems about overlapped notes of Irregular Area Feature again with the method this paper has brought up-the modified the midpoint of the level cutting line algorithm, and also have gained a satisfying result.