Independent researchers pointed to a few of those factors, including the fact that the taxi and ambulance drivers in the study died on average around ages 64 to 67, while Alzheimer’s onset is typically after age 65.
Further, few of the drivers were women, who are more likely to develop Alzheimer’s than men, and the analysis didn’t consider genetics or include scans that could show any changes to the brain as a result of their jobs.
So this is a long, long way from being able to say, for example, that driving a taxi prevents Alzheimer’s.
An outage at their Amsterdam ISP knocked OpenStreetMap offline on Sunday; they’ve spent the past two days in read-only mode via their secondary server in Dublin but appear to be back up and running as of 8:45 AM EST today. Details at the OSM community forum.
“Scientists mapped the flow of water through every single river on the planet, every day over the past 35 years, using a combination of satellite data and computer modeling. What they found shocked them,” CNN reports. “Nearly half of the world’s largest downstream rivers—44%—saw a drop in the amount of water flowing through them each year, according to the research published Thursday in the journal Science.” On the other hand, smaller, upstream rivers saw an increase in flow.
The decline in passenger rail service in the U.S. and Canada is charted by this interactive map, which uses a slider to compare Amtrak and Via Rail service in 1980 with what it is today. [Maps Mania]
I haven’t seen many maps of the 2024 U.S. presidential election results, but then I haven’t been looking very hard for them either. Last week, CNN posted some charts and maps showing where the candidates under- or overperformed relative to the 2020 election. “Perhaps it shouldn’t be surprising that in the states where the campaign was the most hotly contested, more people voted in 2024, whereas in states where one side or the other seemed more likely to win, turnout generallydropped.”
The headline accompanying this Economic Times (India) article is more than a bit misleading: ”Google Maps leads three men to death as car plunges from incomplete bridge into river.” Horrifying. The bridge across the Ramganga River in Uttar Pradesh was closed after a part of it had been washed away in a flood several months previously. But there’s a twist. Google Maps didn’t mark the bridge as closed, and did route the travellers across it, but the road hadn’t been blocked or marked closed on the ground either. This wasn’t a case of ignoring local signage and blindly following online maps: local signage failed too. Google isn’t a panopticon: someone would have had to tell Google Maps that the bridge was closed, and I have to wonder whether that happened. But a Google Maps error makes for a better headline, one that goes international, than a horrible local lapse. At any rate, an investigation is ongoing. [Jalopnik]
Alice Hudson, who from 1981 to 2009 was chief of the New York Public Library’s Lionel Pincus and Princess Firyal Map Division, and as such responsible for one of the world’s significant map collections, died on 6 November 2024 from complications of kidney disease. She was 77. The New York Times published her obituary yesterday.
The first intimation I had that maps involved mathematics was when I looked up a map projection and came face to face with the equation that generated it. Math was never my strongest subject, so it’s probably for the best that I never went into cartography. Especially since it turns out that there’s a lot more math hidden behind the maps we use on a daily basis than you might think, a point demonstrated in detail by Paulina Rowińska’s book, Mapmatics, which came out in June from Picador in the U.K. and from Belknap in the U.S. in September.
Cartographic problems are often mathematical problems: Gauss’s Remarkable Theorem demonstrates that a flat projection of a round globe must necessarily add distortion. Surveying by triangulation is simple trigonometry. The coastline paradox, whereby the length of a coastline depends on the scale at which it’s measured, is because the coastline is fractal. Real-world navigational problems can be solved via topology and graph theory, algorithms and heuristics. The takeaway from this book is these things are math, and that math is at the heart of so much of this.
Rowińska is a mathematician and science writer, and she very much approaches her subject from the math side of things. Making the subject accessible to non-mathematicians is no small challenge, especially when moving to subjects that, while absolutely part of the discipline of mathematics, don’t obviously code as such to normies. Graph theory, number theory, probability density function and topology make their appearances. (I confess to being surprised at the omission of GPS, but now that I think about it, GPS is really about timekeeping and physics.) No less a challenge is finding the balance between explaining the mathematical concepts and explaining how they apply to mapping, and doing so in a way that doesn’t completely lose the plot and turn the whole thing into a math textbook with cartographic examples.
On balance I think Rowińska mostly succeeds: there were plenty of points where the math was still esoteric to me, but I still got that, yes, this was math, and here’s what it does in these cases. As the book progresses the math gets a bit more remote from popular understanding, and the map side of things is less about maps than the data being mapped, but even then the examples are absolutely real-world and relatable (gerrymandering, disease mapping), and there are plenty of a-ha moments coming from the math behind familiar puzzles like the travelling salesman problem and the four-colour theorem.
I received an electronic review copy from the publisher.
Lots of little companies and individuals making and selling maps; the Independent Map Sellers page lists a bunch of them in one handy place. “Interested in buying something special for the map enthusiasts in your life (or yourself)? Skip the giant companies and go straight to the source: there are loads of skilled, independent cartographers out there whose work you can buy!” [DanielHuffman]
The Yellowhead Treaty Map is an interactive map of the various treaties between the state and Indigenous peoples in Canada. “Covering every Canadian treaty from 1763 to the present, The Treaty Map aims to challenge the commonly held view of treaties as land surrenders and offers a comprehensive, interactive learning and teaching tool, grounded in Indigenous perspectives of treaties.” [Ian Mosby]
The Map Room’s Twitter account was finally deactivated on Wednesday after roughly two years of sitting idle. If the @maproomblog username is resurrected and reused, it ain’t me.
Follow The Map Room on Bluesky or Mastodon instead. Cross-posting to the Facebook page continues, though given how Meta is it’s unlikely you’ll see things there.
Pacific nations like Fiji, Kiribati and Tuvalu will face at least 15 cm of sea level rise over the next 30 years, according to a NASA analysis. “In addition to the overall analysis, the agency’s sea level team produced high-resolution maps showing which areas of different Pacific Island nations will be vulnerable to high-tide flooding—otherwise known as nuisance flooding or sunny day flooding—by the 2050s. Released on Sept. 23, the maps outline flooding potential in a range of emissions scenarios, from best-case to business-as-usual to worst-case.” [Universe Today]
A large portion of the collection includes world maps of all sizes, ranging from functional to more experimental. One 1590 cordiform map, for example, places the heart-shaped world inside of a fool’s cap, resulting in an unsettling visual commentary on previous conceptions of world geography. A 1555 map, alternatively, presents the world in gores, or segmented parts, which can be cut out and pasted onto a sphere to create a globe. This blend of art, science, and history is at the heart of the Franco Novacco Collection. […]
The Newberry Library acquired the Novacco Collection from the Venetian map collector Franco Novacco himself in 1967. Since then, the maps have only been available for viewing on-site in the Newberry’s reading rooms. In early 2022, the Newberry received generous funding from Mr. Rudy L. Ruggles, Jr. and Barry Lawrence Ruderman Antique Maps to begin digitizing the entirety of the collection.
