成功解决pip/conda install cartopy安装失败问题

使用pip（或conda）安装cartopy

 pip install cartopy

报错

    ERROR: Command errored out with exit status 1:
     command: /home/mlli/anaconda3/envs/deepsphere/bin/python -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/home/mlli/pip-install-6xdwlgfn/cartopy_b061d538b6be48e0a39db2878cca4ebf/setup.py'"'"'; __file__='"'"'/home/mlli/pip-install-6xdwlgfn/cartopy_b061d538b6be48e0a39db2878cca4ebf/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base /home/mlli/pip-pip-egg-info-avvdfa6v
         cwd: /home/mlli/pip-install-6xdwlgfn/cartopy_b061d538b6be48e0a39db2878cca4ebf/
    Complete output (3 lines):
    /home/mlli/pip-install-6xdwlgfn/cartopy_b061d538b6be48e0a39db2878cca4ebf/setup.py:107: UserWarning: Unable to determine GEOS version. Ensure you have 3.3.3 or later installed, or installation may fail.
      '.'.join(str(v) for v in GEOS_MIN_VERSION), ))
    Proj 4.9.0 must be installed.
    ----------------------------------------
ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.
(

 whl安装未果，最后根据Stackoverflow解决方法如下：

conda install --channel conda-forge cartopy