QGIS是一个用户界面友好的桌面地理信息系统，可运行在Linux、Unix、Mac OSX和 Windows等平台之上。它的官方主页是：http://www.qgis.org/-QGIS is a user-friendly desktop geographic information systems, can run on Linux, Unix, Mac OSX and Windows and other platforms. It' s official home page i

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