CASS软件教程，直接安装使用，简单直观，CASS 7.1是南方测绘仪器公司在AutoCAD 2004上开发的新一代数字化地形地籍成图软件-CASS software tutorials, direct installation, simple and intuitive, CASS 7.1 mapping equipment in the South in AutoCAD 2004 to develop a new generation of digital terrain cadastral