title: Overlaying two grids
body: <p>I would like to ask some advice about the best way to approach this problem:</p>
  
  <p>I have drawn two grids; one square, one hexagonal.</p>
  
  <p>I am overlaying the hexagonal grid over the square one.</p>
  
  <p><img src="https://i.stack.imgur.com/dbbpz.jpg" alt="Image"></p>
  
  <p>What would be best to average the squares underlying each hexagon so each hexagon's value is the average of the squares underneath?</p>
  
  <p>What do you think would be the most efficient way to do this? Is there an inbuilt command which I cannot find?</p>