title: How to install cartopy on windows
body: <p>I tried command: pip3 install cartopy on my windows, but it doesn't work and it hints me:</p>
  
  <pre><code>  setup.py:171: 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
  </code></pre>
  
  <p>Then I tried to install it through conda command and it seems that it works for the conda list shows the presentation of cartopy libarary. However, when I import cartopy, it hints me:</p>
  
  <pre><code>No Module Named cartopy
  </code></pre>