: 合并後的中心位置能否透过GIS软体计算出 : 不知道QGIS有没有办法做这样的处理 QGIS为一简单的Desktop GIS软体平台，藉着QGIS开放候特性， 很容易与其它软体合作，如GRASS、PostgreSQL(PostGIS)。 亦可使用C++/python开发扩充QGIS的功能。 其中QGIS的python plugin-fTools就有常用的GIS功能。 以下是fTools主要的功能 # Perform geoprocessing operations including intersections, differencing, unions, dissolves, and clipping. # Extract relevant geometry info and products from existing layers including centroids, nodes, lines, single and multipart geometries, simplified geometries, and more. # Perform several sampling and field-based tasks, including generating grids, both regular and random point generation, random and spatially constrained selections, and study area extraction. 安装方法 1.确定QGIS有安装python支援 说明 http://gis-tech.blogspot.com/2009/02/qgis-10python.html 2.安装python plugin - fTools 说明 http://gis-tech.blogspot.com/2009/02/qgis10python.html 3.fTools算出多边形的中心 说明图片 http://tinyurl.com/dlmh9y yao --

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