基于地形图数据库的跨比例尺级别缩编更新方法研究

针对利用1：500地形图快速更新其他比例尺地形图的需求，本文提出了基于地形图数据库的同比例尺级别和跨比例尺级别全自动缩编更新入库的方法。通过设计地形图模板及过渡模板，定义地物要素综合取舍转换规则，开发自动缩编软件模块，定制自动缩编更新任务，利用数据库中测量更新范围线自动下载地形图数据进行缩编及更新入库，实现大比例尺地形图依次缩编更新获取多种比例尺地形图的目标。本文提出的技术方法已在长沙市城市基础地理信息数据库更新工作中得到了验证，为采用缩编方式快速获取多样性地理信息数据提供了技术经验。

Research on automatic downsizing and updating of cross scale level based on topographic map database

In order to meet the requirement of updating other scale topographic maps with 1∶500 topographic map,a method of automatic downsizing and updating at the same scale level and across scale level based on topographic map database is proposed.Through the design of topographic map template and transition template,defining the conversion rules of comprehensive feature elements,developing automatic downsizing software module,customizing the task of automatic downsizing and updating,automatically downloading the topographic map data by using the survey update range line in the database for downsizing and updating,Which realize the goal of successively downsizing and updating large-scale topographic map to obtain various scale topographic maps.The technical method proposed in this paper has been verified in the updating of urban basic geographic information database of Changsha city,which provides technical experience for rapid acquisition of diverse geographic information data by downsizing.