1、首先打开GOOGLE地图，搜索进入所需位置的地形图中。
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https://iknow-pic.cdn.bcebos.com/8b13632762d0f7034503eabd07fa513d2697c51a"/>
2、将所需要的地形范围尽量放大，使用google地图的距离测量工具测量尽可能长的距离（鼠标右键——测量距离——再选择第二点左键），并使用截图软件对所需范围截图，并保存成JPG格式。
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https://iknow-pic.cdn.bcebos.com/4d086e061d950a7bcbf332a505d162d9f3d3c989"/>
3、打开CAD地形图，输入ATTACH命令，加载上一步保存的JPG图片至CAD中，比例大小随意。选中加载的图片，
输入SC命令，鼠标左键选择基点——R(参照）——指定参照长度（选取图片中测量距离的两点）——指定新的长度（此处输入图片中测量的长度2560米），即完成图片大小缩放至CAD图中尺寸。
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4、找一个对应点（例如两河道、道路交点，楼房角点等），将图片移动到CAD矢量图上。
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https://iknow-pic.cdn.bcebos.com/42166d224f4a20a4a66e42a69f529822720ed05b"/>
5、此时可能图片覆盖在CAD图上边了，导致无法看到矢量图。选中图片输入DR命令——B，将图片置于底层。
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https://iknow-pic.cdn.bcebos.com/ac4bd11373f08202ccadee5e44fbfbedab641b97"/>
6、再根据两图建筑物位置进行微调，完成效果图。
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