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Creating polygons in FME can be accomplished by using a polyline or line features,例如街道网络,以及区域生成器transformer.Since a street network is a set of topologically connected linework,区域生成器能够从由顶点/端点和形状(即a closed polygon).然而,areas can also be created from disconnected line features using the直线闭合器.
create-a-polygon-from-line-segments.fmwt
注:既然你是使用面向公共的数据库,tables can occasionally be overwritten and/or modified.如果你的翻译产生了意想不到的结果,查看重置PostGIS培训数据库article.或者,you can download the provided file(s) and replace the PostGIS reader with a reader of the appropriate format.
In this tutorial,您将从由干道组成的街道网络为城市街区创建多边形,Residential,私人,以及使用区域生成器的非城市街道。
For more information on Creating a Translation,查看Desktop Basic Course Manual.
注意:当需要清空表并更新数据库架构时,将使用DROP和CREATE。For example,drop and create is used to remove the table structure,可能添加或删除列,change data types,等。有关编写器功能类型参数(如表处理)的详细信息,查看文档.
注意:自动属性定义是工作台自动定义属性列表时,取决于连接的读卡器功能类型。Further,the list of attributes on the Writer feature type will update automatically whenever attributes are changed (i.e.renamed,removed,等)在工作区。有关用户属性和属性定义的详细信息,查看文档.
关闭参数前,调整捕捉预处理参数,确保街道网络拓扑正确。
注意:捕捉公差是以地图单位测量的,在这种情况下是米。
After running the translation,you can view the new table by selecting the writer and clicking the Inspect button in the shortcut menu that appears when the writer is selected.
Data used in this tutorial originates from open data made available by the温哥华市,British Columbia.It contains information licensed under the Open Government License - Vancouver.
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