title: how to scale Quiver diagrams correctly
body: <p>I'm trying to find a solution to the following problem:  </p>
  
  <p>I create maps of ocean currents, where the data is in cm/sec. The arrows i get using matplolib.quiver have relatively big heads and small tails. This way it's hard to read the map.</p>
  
  <ol>
  <li>Is there a way to play with the length of the tail and with the size/width of the head ?</li>
  <li>When i zoom in, my arrows are too small. I can't see their direction nor their size. Is there a way to solve it?</li>
  </ol>