GIS专题数据库中多层注记重叠问题的解决与自动配置

GIS专题数据库中面状对象的注记一般会自动配置在图形的重心位置。当同一个面状对象在多个数据层中被赋予不同的属性定义时,注记符号和文字将会重叠在同一个位置。当使用的GIS建库软件存在这方面的缺陷时,解决多层注记重叠、自动重新配置注记符号这一命题就显得至关重要。本文以张家界市武陵源城镇地籍数据为例,从多边形形状度量入手,给出基于Delaunay三角网法的骨架线提取算法,较好地解决了多数据层注记重叠和注记符号自动配置问题,提高了工作效率。

Solution and auto-configuration for the notes of multiple-data layers in GIS thematic database

Generally the note of an area feature in GIS thematic database is auto-configured on the center of gravity position in the polygonal.The annotation symbols and texts would overlap in the same location when an area feature is given different attribute definitions in multiple-data layers.The solution proposition of the multi-note’s overlap and automatical re-configuration becomes particularly important when the GIS software could not deal.This study took the cadastral data of Zhangjiajie Wulingyuan scenic area as an example,started from the polygonal shape measure,and then gave the skeleton extraction algorithm based on Delaunay triangulation method,a solution was obtained finally.It could improve the work efficiency.