利用 ezdxf 库读写geotiff格式的地形影像方法（InsertRasterToCAD）
包一：dxfgrabber
GitHub - mozman/dxfgrabber: Outdated DXF reader, please switch to ezdxf
Documentation
dxfgrabber — dxfgrabber 1.0.0 documentation
包二：ezdxf
GitHub - mozman/ezdxf: Python interface to DXF
Documentation
Start - ezdxf
Quick-Info — ezdxf 0.8.9 documentation
Quick-Info — ezdxf 0.9 documentation
针对以上两个包，原作者推荐"ezdxf",如下：
mozman (Manfred Moitzi) · GitHub https://github.com/mozman
pip install --user ezdxf
或者：py -3 -m pip install --user ezdxf
注意：ezdxf v0.9提供对Python 3.5以上版本的支持
