There’s a lot of stuff relevant to our interests on the website of the University of Richmond’s Digital Scholarship Lab, and it’s hard to know what to begin with. One of the more recent projects, which CityLab saw fit to link to yesterday, is an interactive map showing elections to the U.S. House of Representatives from 1840 to 2016. It’s the kind of project that the user can get very, very lost in. In addition to the usual map of U.S. congressional districts, the site can also visualize the districts as a dot map to minimize the empty-land-doesn’t-vote problem (they call it a cartogram: it isn’t). There’s also a timeline showing the overall results over time at a glance; selecting a district gives shows how the district voted in past contests as a line graph. In other words: quite a lot of data, economically presented.
FiveThirtyEight looks at the polling data for the upcoming 2018 midterm elections and imagines the results for the U.S. House of Representatives if only women, men, nonwhite voters and white voters by education level voted. It’s a thought exercise they’ve indulged in before, with the presidential race in 2016, and it serves to indicate the demographic divide in voting intentions. (Cartographically, the maps suffer from the usual problem of U.S. election maps of congressional districts—large, sparsely populated districts in the middle of the country dominate the map.)
Carbon monoxide released into the atmosphere by the California wildfires is drifting across North America in concentrations sufficient to turn up on the Atmospheric Infrared Sounder (AIRS) on NASA’s Aqua satellite. A series of maps showing CO concentrations in the United States between 30 July and 7 August, using AIRS data, have been combined into the animation above.
Previously: Mapping the Northern California Wildfires.
Bloomberg explores land use in the United States with a series of low-resolution maps that become more and more like infographics in the shape of the lower 48 states. It’s a revealing look at the big picture, with some surprises: 41 percent of U.S. land is used to feed livestock.
Dave Imus is in the news again: he’s the subject of this profile by Oregon Public Broadcasting, which looks at his childhood, his career, and his sudden launch to fame and fortune when his iconic, award-winning map of the U.S. was called “the greatest paper map of the United States” by Slate. It also drops a bit of news: Imus is working on a new edition of his map, which will see a limited release in November before the regular version is published in 2019. [Gretchen Peterson]
This is a map of the United States without insets. Published in 1975 by the U.S. Geological Survey, it shows Alaska, Hawaii and the lower 48 states in the same, continuous view—though Hawaii’s Leeward Islands are cut off (as are the various territories). Can’t have everything, I guess. It’s available from the USGS as a free downloadable PDF; the paper version costs $9. [MapPorn]
Previously: Alaska’s Cartographic Revenge.
The Washington Post is mapping the locations where migrant children are being detained, and is asking for reader submissions to update the map. [Kaz Weida]
I believe other maps of detained children are being produced; I’ll post links as I learn of them.
Puerto Ricans, as U.S. citizens, are able to travel freely between Puerto Rico and the U.S. mainland. In the wake of Hurricane Maria, many of them sought refuge in Florida, New York and other parts of the U.S. Using anonymized cell phone location data for some 500,000 smart phones, data analysis firm Teralytics was able to map where Puerto Ricans moved from August 2017 to February 2018. CityLab has the maps and the story: “Between these months, nearly 6 percent of the Puerto Rican population left the island and is still living in the continental U.S. Another 6 percent left between October and September 2017 but returned to the island by February 2018.”
John Nelson’s map of tornado migration in the United States, showing the seasonal variations in tornado occurrence, is a master class in data visualization and design—in deciding on the right way to present geographic information. The map combines three styles—impressionistic choropleth, weighted mean centre movement diagram, and small multiple—to present month-by-month information all at once; in the accompanying text (also here), Nelson discusses some of the alternatives he could have chosen instead. And in a separate post he talks about how he made the map. [Esri]
Previously: Mapping Tornado Tracks.
As promised, Kenneth Field has uploaded the final web version of the quick-and-dirty dasymetric dot density map of the 2016 U.S. presidential election results, which he posted to Twitter last month. Unlike the quick-and-dirty version, the final version is in high resolution and can be zoomed in to quite a preposterous degree. One dot, one vote. [Kenneth Field]
In February the FCC released a new broadband map showing the availability of high-speed internet in the United States. The previous map was apparently useless, but the new map has been coming in for its share of criticism as well because it doesn’t match the reality on the ground. Partly it’s because the map shows the number of internet providers providing service by census block whereas actual availability is more granular than that. But only partly. Techdirt’s Karl Bode says both old and new versions of the map “all-but hallucinate available options out of whole cloth while vastly over-stating the speeds available to American consumers”:
For example, I can only get access to one ISP (Comcast) at my residence in Seattle, purportedly one of the nation’s technology leaders. Yet the FCC’s new map informs me I have seven broadband options available to me. Two of these options, CenturyLink DSL and CenturyLink fiber are somehow counted twice despite neither actually being available. Three others are satellite broadband service whose high prices, high latency and low caps make them unsuitable as a real broadband option. The seventh is a fixed-wireless option that doesn’t actually serve my address.
— Post Graphics (@PostGraphics) March 24, 2018
Winter isn’t quite done with us yet where I live. And with that in mind, here’s a neat animated map from the Washington Post that shows the total accumulated snowfall in the contiguous United States. The link includes 48-hour snowfall accumulation maps, satellite imagery, and a map showing which areas of the lower 48 have had more or less snowfall than Washington, D.C. I imagine these maps will have to be updated now.
Earlier this week, Kenneth Field posted a quick-and-dirty dasymetric dot density map of the 2016 U.S. presidential election results to Twitter. It quickly went viral. In a subsequent blog post, he goes into some detail about the process of making the map. “The screengrab was quick and dirty and while there have been many and varied comments on the ‘map’ it’s by no means the finished article. I want to create a hi-res version and also make a web map like the 2012 version. I don’t have time to do this in the next couple of weeks but it will happen. But I am aware of a number of issues and some have already spotted them as have many others.”
See also Field’s gallery of thematic maps of the 2016 U.S. presidential election results.
Reddit user academiaadvice maps the rate of gun homicides per 100,000 residents by state from 2007 to 2016 (above).
The Washington Post has maps of Marjory Stoneman Douglas High School in Parkland, Florida—where last week’s shooting took place—and its surrounding area.
We’ve seen maps reimagining the United States reorganized into a different number and configuration of states before, but this map by Reddit user Upvoteanthology_ looks north of the border for inspiration. It imagines what would happen if the U.S. were organized like Canada, with the same population imbalances: Ontario, for example, has 38.9 percent of the Canadian population, so this map imagines a superstate, Shanherria, with 38.9 percent of the U.S. population that spans the entire U.S. South, plus Kentucky, Missouri, Kansas and the non-Chicago parts of Illinois. Meanwhile, Maine is roughly equivalent to Prince Edward Island, and the three northern territories map to Alaska.