Data Viz Done Right

March 8, 2017

Workout Wednesday: UK House Prices Hexbin Maps

No comments
Another great learning experience today for me thanks to Emma! This week required us to create hexbin maps in Tableau. I'd never done these before, so I got stuck in, knowing I'd come out of it have learned something.

Let's start with Emma's requirements:

  1. Create the hexbin map based on the District 
  2. Change the size of the hexagon using a parameter
  3. Match the sunrise-sunset diverging colour palette on the hexagons
  4. Match the tooltips and titles
  5. Set the dashboard size to 650 * 700 pixels

Fortunately Emma linked to a blog post by Matt Chambers for how to use the HEXBINX and HEXBINY functions. This made the exercise immensely easier because all I really needed to do was swap out [Ratio] in the blog post with my parameter.

I couldn't get the total in my title to match, though I knew I had done it right. It turns out Emma used an LOD that returns the average for both years, not just the year selected. I decided to use the year selected because that reflects what's in the map. I also create this value with a table calc since all of the dimensions I needed were already in the view.

Also, requirement #2 to change the size is actually a requirement to change the denstiy, i.e., how many hexabins are created. So, I decided to also size the hexagons based on how many are displayed in the view. So if you enter a smaller number, the hexagons are bigger. Enter a big number and the hexagons are smaller. I also limited the parameter to between 20-200.

Lastly, I floated everything since the color legend had to be floated above the hexmap. I find that Tableau works best when you go either 100% float or 100% tiled.

Nice fun challenge! Learned a bunch!

No comments

Post a Comment