topographic map data base 地形图数据库
Digital Topographic Map data 数字地形图数据
topographic map data updating 地形图数据更新
topographic map data processing 地形图数据处理
Firstly, the request of vector map data is summarized, such as color-setting standard, attribute definition of topographic feature, etc.
首先对入库的矢量图形数据要求做了概述，如要素的分层设色标准、地形图要素属性项定义等；
By using 1:500 topographic map updating 1:2000 topographic through generalization of automatic cartography, decrease the burden of UBGIS data revision.
通过地图自动缩编利用1：50 0地形图更新1：20 00地形图，减少城市基础地理信息系统的更新负担。
Beginning with the nature and character of map symbols, it classifies coastal zone topographic map symbols and data according to the actual application.
从地图符号的本质和特征入手，根据具体应用把海岸带地形图符号进行分类和数据分层。
应用推荐