title: Generate Weight Map in Color with MatPlotLib?
body: <p>I have a map, on top of which I wish to <strong>overlay a color weight map</strong>. The weight map has <code>m x n</code> <code>1m x 1m</code> boxes. I have many points, and each point carries a weight. The weight of a box is calculated by summing up the weights of all the points that fall into that box.</p>
  <p>Now according to their wights, a certain color is filled for each box according to its weight.</p>
  <p>The desired outcome is similar to <a href="https://stackoverflow.com/a/2461029/2106753">the one shown here</a>, but</p>
  <ol>
  <li>The map and the weight map have to be overlayed nicely in my case.</li>
  <li>Instead of frequency, the weights that have been calculated should be used to assign the color.</li>
  </ol>
  <p>How may I do this?</p>