Geography graduate student Derek Watkins has some fun with population densities in an interactive version of William Bunge’s The Continents and Islands of Mankind. The above shows areas in the world where there are at least 15 people per square kilometer. In the interactive, a slider lets you shift that number up to 500 where only a few spots in the world remain.

An interesting thing about this map is that each layer is contained in one 23,000 pixel tall spritesheet to reduce load time. An uninteresting thing is that my workflow was to export black and white density images from QGIS (which I’ve been working with more lately), generalize in Illustrator, export each slice and then stitch them together into one image with ImageMagick. I grabbed the population data from here.

[via Derek Watkins]

Explore weekly earnings between men and women, over the past nine years. There’s more to say about it, but my hands are tired from manually editing parsed PDF files, so I’ll leave that for later.
Basically, three or four articles on the gender wage gap popped up on my radar last week, some focusing on the rise of women as the lead household earner and others on how much less women make. Such contrast. So I took a look.

Women computer support specialists rockin’ it.

Using hand-recorded shipping data from the Climatological Database for the World’s Oceans, history graduate student Ben Schmidt mapped a century of ocean shipping, between 1750 and 1850. The above map animates a seasonal aggregate.

There aren’t many truly seasonal events, but a few stand out. There are regular summer voyages from Scotland to Hudson’s Bay, and from Holland up towards Spitsbergen, for example: both these appear as huge convoys moving in sync. (What were those about?) Trips around Cape Horn, on the other hand, are extremely rare in July and August. More interestingly, the winds in the Arabian sea seem to shift directions in November or so. I also really like the way this one brings across the conveyor belt nature of trade with the East.

The bobbing month label is distracting, but its position actually does mean something. Since seasonality (i.e. weather) plays a role in travels, the label represents noontime location of the sun in Africa. Okay, I’m still not sure if that’s actually useful.

If you really must, you can also watch the century of individual shipments during a 12-minute video.

By the way, Schmidt used R to make this, relying heavily on the mapproj and ggplot2 packages. (Bet you didn’t see that coming.) I think he created a bunch of images and then strung them together to make the animation.

[via Revolutions]

Kaiser Fung talks about the suck of overlaying plots to show a relationship.

When the designer places two series on the same chart, he or she is implicitly saying: there is an interesting relationship between these two data sets.

But this is not always the case. Two data sets may have little to do with each other. This is especially true if each data set shows high variability over time as in here.

This seems to happen a lot when people take the data-to-ink ratio too literally or they’re trying too hard to be clever within a given space. Overlays work on occasion, but I can’t think of any that did off the top of my head. Most of the time it’s better to split up the layers into multiple charts.

In a study by TheLadders (of n equals 30), recruiters looked at resumes and make some judgments. During evaluations, eye tracking software was employed, and they found that the recruiters spent about six seconds on a resume looking for six main things: name, current company and title, previous company and title, previous position start and end dates, current position start and end dates, and education. After that, it was a crapshoot.

Beyond these six data points, recruiters did little more than scan for keywords to match the open position, which amounted to a very cursory “pattern matching” activity. Because decisions were based mostly on the six pieces of data listed above, an individual resume’s detail and explanatory copy became filler and had little to no impact on the initial decision making. In fact, the study’s eye tracking technology shows that recruiters spent about 6 seconds on their initial “fit/no fit” decision.

If I ever have to submit a resume, I’m just going to put those six things as bullets and then the rest will all be keywords in small, light print. It’ll be like job search SEO.

Update: I’ve been told that TheLadder’s reputation might be less than savory, and a quick search shows some in agreement, so it might be wise to sidestep the service. Instead, go with my awesome six-bullet advice and you’re gold.

[via @alexlundry]

The Washington Post asked three “young entrepreneurs” how their company uses infographics. They responded with similar sentiments. The first one said:

Infographics can be great as part of presentations, newsletters or other research content. It keeps people’s interest by lending a storytelling and visual element to what can be sterile research.

The second said:

Infographics are outstanding for bringing life to content that would otherwise be dry, uninteresting or unshareable.

And the last one, who to be fair, seems to know more than the first two, said:

At the end of the day, the main use for infographics is to create content that can potentially go viral and drive traffic, links and exposure to a Web site and the brand.

If I were new to these infographic things, my main takeaway here would be that they’re used to make boring material interesting. Shouldn’t it be the other way around though? Information graphics are interesting because their foundations of data and um, information are worth looking at in the first place. Don’t fall into the trap of trying to make something “visually compelling” without anything to compel with.

In usual xkcd fashion, Randall Munroe plots the depths of lakes and oceans, including “mysterious door which James Cameron built his sub to reach and open.”