: 合併後的中心位置能否透過GIS軟體計算出 : 不知道QGIS有沒有辦法做這樣的處理 QGIS為一簡單的Desktop GIS軟體平台，藉著QGIS開放候特性， 很容易與其它軟體合作，如GRASS、PostgreSQL(PostGIS)。 亦可使用C++/python開發擴充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. 安裝方法 1.確定QGIS有安裝python支援 說明 http://gis-tech.blogspot.com/2009/02/qgis-10python.html 2.安裝python plugin - fTools 說明 http://gis-tech.blogspot.com/2009/02/qgis10python.html 3.fTools算出多邊形的中心 說明圖片 http://tinyurl.com/dlmh9y yao --

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