title: Using pcolor or pcolormesh with data in mesh center (polar plot)
body: <p>I want to make a polar plot of a temperature field. </p>
  
  <p>I used pcolor/pcolormesh but both of them make an interpolation between each corners of the mesh.</p>
  
  <p>Thus, I am looking for a simple way to center the meshes on the center of my data with a mesh color corresponding to the data only in the center of these meshes.</p>
  
  <p>Finally, It would be very nice if I could have polar meshes and not rectangular meshes.</p>
  
  <p>Thanks for your help.</p>