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In this exercise, you will learn how to perform a union between overlapping polygon features using theAreaOnAreaOverlayer。所述AreaOnAreaOverlayer通常用于三个主要操作:(1)重叠解构多边形以产生交叉点和不同点,(2)比较多个数据集为区域重叠,并且基于重叠区域中的数据(3)面积计算。
polygon-in-polygon-overlay.fmwt
注:由于你是working on a public facing database, tables can occasionally be overwritten and/or modified. If your translation produces unexpected results, see the重置PostGIS的培训数据库文章。或者,您也可以下载所提供的文件(S),并用适当的格式的阅读器取代PostGIS的读者。
In this scenario, you will be performing area calculations based on overlapping historic zones and neighborhood polygons. This will allow you to identify which historic areas belong to each neighborhood and the total area of each historic zone.
该AreaOnAreaOverlayer变压器将用于相交的多边形进行面积上面积覆盖 - 所有多边形被认为是对对方,它们重叠,创建新的多边形,其中代表重叠区和去除重叠与原有的区域两者。有关AreaOnAreaOverlayer更多的技术细节。有关AreaOnAreaOverlayer更多技术详情,请参阅文档。
Note: area is calculated in square map units. For a more in-depth tutorial on area calculations, see theArea Measurements with the AreaCalculator文章。
数据在从通过提供开放的数据本教程中使用的源自温哥华市, 不列颠哥伦比亚省。它包含了开放政府许可协议进行许可信息 - 温哥华。
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