title: Masked contourf to array (Python)
body: <p>At my stage of my project, i'm wondering how to continue properly.
  I need to mask a contourf from an GZ500 anomaly layer (with a threshold of 200gpm in this example), but only the one with the green cross inside (you can see there is another anomaly over Iceland). Then i need to save this mask to an array to save it in netcdf format.</p>
  <p><a href="https://i.stack.imgur.com/xpy7U.jpg" rel="nofollow noreferrer">gpm anomaly</a></p>
  <p>I don't know which is the best way to achieve this. I will use the masked array to retrieve only the values of the anomaly i want, then save it also in netcdf.</p>
  <p>If you have an idea or some tips, i take it !</p>
  <p>Thank you!
  Jonathan</p>