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在FME中创建多边形可以通过使用折线或线特征来完成,such as a street network,and theAreaBuilder变压器。由于街道网络是一组拓扑连接的线条,the AreaBuilder is able to create polygon features from lines that are connected by vertices/endpoints and form shapes (i.e.闭合多边形)。However,区域也可以使用LineCloser.
Note: Since you areworking on a public facing database,有时可以覆盖和/或修改表。If your translation produces unexpected results,see theResetting the PostGIS Training Database文章.Alternatively,您可以下载提供的文件,并用适当格式的读卡器替换PostGIS读卡器。
在本教程中,you will create polygons for city blocks from a street network that consists of Arterial,住宅的,Private,and Non-city streets using the AreaBuilder.
有关创建翻译的详细信息,see the桌面基础课程手册.
Note: Drop and Create is used when a table needs to be emptied and an update is made to the database schema.例如,Drop和Create用于删除表结构,possibly to add or remove columns,更改数据类型,etc.For more information on Writer Feature Type Parameters such as Table Handling,see theDocumentation.
Note: An Automatic Attribute Definition is when Workbench automatically defines the list of attributes,depending on which Reader feature types are connected.此外,每当属性发生更改(即已重命名,远离的,etc.) in the workspace.For more information on User Attributes and Attribute Definitions,see theDocumentation.
Before closing the parameters,adjust the snapping pre-processing parameters to ensure the street network is topologically correct.
Note: snapping tolerance is measured in map units which in this case is meters.
运行翻译后,通过选择编写器并单击在选定编写器时出现的快捷菜单中的“检查”按钮,可以查看新表。
本教程中使用的数据源于City of Vancouver,不列颠哥伦比亚省。它包含根据开放政府许可证(温哥华)获得许可的信息。
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