This is part of a series of posts about the 'little of visualisation design', respecting the small decisions that make a big difference towards the good and bad of this discipline. In each post I'm going to focus on just one small matter - a singular good or bad design choice - as demonstrated by a sample project. Each project may have many effective and ineffective aspects, but I'm just commenting on one.


The 'little' of this next design concerns small-multiple grid maps and a neat way of providing a state legend. The project in focus here was produced by Nathan Yau and maps the spread of obesity across the US over the past 30 years.

lovd-part26a

As you can see, in the top left there is a reference guide that explains which grid cell relates to which state. With any grid map there will always be some degree of state position/neighbour compromise so this helps the reader to immediately (being the first thing you logically see) orientate themselves before they then move through the sequence of yearly patterns.

lovd-part26b

This feels a far less repetitive solution and not as visually intrusive as it would be to include the 2-digit state labels in each map and in cell. I can imagine Nathan toyed with the idea of having cell borders around each state label but I like that he didn't do this - it is sufficiently legible through just relying on white space.


Shortlisted for best 'dataviz website' 2016 award!
The little of visualisation design: Part 25