I was just on Twitter and saw the picture of the second map I’m going to show you, and was shocked to discover it’s from the New York Times, since it’s so different in design than the other New York Times Covid maps I look at every day.
Here is the first map, the main page of the NYT’s coronavirus tracker.
And here is the second map, part of an article published earlier today.
Now, there are two main reasons for the differences between the maps.
1. They are displaying different information.
The first map is color coded according to cases of coronavirus per 100,000 people in a given area over the last week. The second map is looking at when each county hit its covid peak– within the last month, or within the last week. These datasets are related to each other, since you need to have a lot of recent cases in order to have your peak of cases, but they are not the same. So that’s part of why.
But there is another reason. One that I think highlights how the first map is often misleading about how the coronavirus is affecting parts of the country, particularly in the middle.
2. They’re using a different rule for how to draw the colors onto the map.
On the first map, while lines are drawn according to county, the coloring is not. Or at least, they’ve colored in by county in the East, but not out West. Take a look at Montana (or any of the other large states just east of California) and mouse over some of the counties– even though the county as a whole has X concentration of cases and has an alarming graph, only some parts of the county are colored in, likely where the population is concentrated.
On the second map, entire counties are colored in even in those same Western states with small populations. This makes the situation in those states look WAY WORSE than the first map! The first map makes it look like the virus hasn’t even reached large portions of those states, when in reality, there just aren’t many people who live in those areas. For those of us who live in more densely populated areas, it’s easy to assume that there are loads of people there and just nobody’s getting sick.
Both maps are representing virus data from the last 1-4 weeks. So, the areas with the worst situations are the same. But they suggest pretty different things!