Speaking of historical satellite imagery, Bill Morris went digging for satellite imagery of what preceded Manicouagan Reservoir before it was created in the 1960s by Quebec’s massive hydro dam projects. But since Landsat first launched in 1973, after the dam was completed, what imagery was there? Answer: CIA spy satellite imagery from 1965—when satellites took pictures on film that was then sent back to Earth—that was declassified in 1996. Read more.
Author: Jonathan Crowe
Jonathan Crowe blogs about maps at The Map Room. His essays and reviews have been published by AE, Calafia, The New York Review of Science Fiction, the Ottawa Citizen, Strange Horizons and Tor.com. He lives in Shawville, Quebec.
The Truth About Harry Beck: A Play About the Tube Map’s Creator
The Truth About Harry Beck, a play about the designer of London’s iconic Tube map, is at the London Transport Museum’s Cubic Theatre through January. Writer and director Andy Burden spent years working on the play. So far reviews have been mostly positive: Theatre Vibe’s Lizzie Loveridge found it “charming,” Everything Theatre “warm,” and Broadway World calls it “as reassuring as a comfy pair of slippers,” whereas The Arts Desk’s take is more mixed and The Standard dismisses it as “chock-full of mugging, direct address and chuntering dimwittery.” BBC News coverage.
Not coincidentally, it’s the 50th anniversary of Beck’s death. London map dealer The Map House has an exhibition to mark the anniversary: Mapping the Tube: 1863-2023. They’re a map dealer so the displays are for sale, including a draft copy of the map and one of only five remaining first-edition Tube map posters. Runs from 25 October to 30 November, free admission.
Some Google Maps Updates
Google Maps imagery updates include improved satellite imagery thanks to an AI model that removes clouds, shadows and haze, plus “one of the biggest updates to Street View yet, with new imagery in almost 80 countries—some of which will have Street View imagery for the very first time.” The web version of Google Earth will be updated with access to more historical imagery and better project and file organization, plus a new abstract basemap layer. [PetaPixel]
Meanwhile, The Verge reports that Google Maps is cracking down on business pages that violate its policy against fake ratings and reviews.
NASA’s More Accurate Eclipse Maps
For the 2017 solar eclipse, NASA published eclipse maps that took the irregular umbral shadow of the moon into account: the umbra is neither circular nor oval but irregular—more polygonal—thanks to the uneven topography and elevation of both the moon and the earth. Not accounting for that introduces errors into the map that could make the difference between observing a partial rather than a total eclipse. The process behind those more accurate eclipse maps, which involves computer processing of both lunar and terrestrial elevation models, has now been published in The Astrophysical Journal. [Bad Astronomy]
New Gravity Map of Mars Reveals Subsurface Variations
A study presented earlier this month at the Europlanet Science Congress maps the variations in Mars’s gravitational field.
Dr Root and colleagues from TU Delft and Utrecht University used tiny deviations in the orbits of satellites to investigate the gravity field of Mars and find clues about the planet’s internal mass distribution. This data was fed into models that use new observations from NASA’s Insight mission on the thickness and flexibility of the martian crust, as well as the dynamics of the planet’s mantle and deep interior, to create a global density map of Mars.
The density map shows that the northern polar features are approximately 300-400 kg/m3 denser than their surroundings. However, the study also revealed new insights into the structures underlying the huge volcanic region of Tharsis Rise, which includes the colossal volcano, Olympus Mons.
Abstract, press release, Universe Today.
Previously: New Gravity Map of Mars.
China’s GPS Shift and Online Maps
If the road grid in online maps of China doesn’t line up with the aerial/satellite imagery layer, Anastasia Bizyayeva explains in a Medium post earlier this year, it’s because China’s map data uses a different geodetic datum, GCJ-02, rather than WGS-84. “GCJ-02 is based on WGS-84, but with a deliberate obfuscation algorithm applied to it. The effect of this is that there are random offsets added to both latitude and longitude, ranging from as little as 50m to as much as 500m.” Chinese map companies are obliged to use GCJ-02 so their maps and imagery line up; outside China, companies can choose to use Chinese data and imagery and have alignment artifacts at the Chinese border, or use Chinese data with images aligned with WGS-84 and have the roads appear offset from the imagery. [Kottke]
Review: Atlas of Iowa
Most of the maps in the Atlas of Iowa, which came out last month from University of Iowa Press, are thematic maps: mainly graduated symbol maps and (to a lesser extent) choropleth maps, that show data at the county or (to a lesser extent) census district or precinct level. These are functional maps, means to an end rather than impressive examples of cartography in their own right. They do the job they were designed to do, which is to present the history, demographics and economics of America’s 29th state in cartographic form. And by and large they succeed: I’ve never so much as set foot in Iowa, but the Atlas of Iowa taught me a great deal about it.
Continue reading “Review: Atlas of Iowa”Atlas of Ungulate Migration
The U.N. has launched an online Atlas of Ungulate Migration. “Driven by tracking data on ungulate migrations, the Atlas of Ungulate Migration serves as a repository for up-to-date migration maps that can inform conservation planning, infrastructure development and policy making. The maps detail high, medium and low-use migration corridors for a diversity of species, ranging from the iconic Serengeti wildebeest and African elephant, to the saiga of the Central Asian steppe. Most importantly, the maps illustrate where critical migration routes intersect with linear barriers like roads or railways. This atlas represents the best available science for extant migrations, with downloadable maps each accompanied by a factsheet describing the migration in detail, the data analysis, and its specific threats. The atlas is living, and continually updated.” News release.
Two Map Books from the Bodleian
Some coverage of two map books published earlier this year by Bodleian Library. First, Atlas Obscura interviews Kris Butler, whose Drink Maps in Victorian Britain looks at how the temperance movement used maps to fight excessive alcohol consumption. They were, apparently, directly inspired by John Snow’s cholera map. From the interview:
Drink maps were specific to targeting the U.K. magistrates, to try to get these lawmakers to stop granting licenses. So it had a really specific legislative, regulatory goal. […] In one case [in 1882, in the borough of Over Darwen in Lancashire, England], after looking at a drink map, the magistrates decided to close half of the places to buy alcohol. Their rationale was, even if we close half of these, you still don’t have to walk more than two minutes to buy another beer, which I just think is the most beautiful rationale I’ve ever read. It was challenged, and it held up on appeal.
Meanwhile, the Bodleian’s own Map Room Blog (no relation) points to Debbie Hall’s Adventures in Maps, a book about maps and travel and exploration. From the book listing: “The twenty intriguing journeys and routes featured in this book range from distances of a few miles to great adventures across land, sea, air and space. Some describe the route that a traveller followed, some are the results of exploration and others were made to show future travellers the way to go, accompanied by useful and sometimes very beautiful maps.” I reviewed Debbie Hall’s Treasures from the Map Room (also no relation) in 2016.
Adventures in Maps by Debbie Hall: Amazon (Canada, UK) | Bookshop
Drink Maps in Victorian Britain by Kris Butler: Amazon (Canada, UK) | Bookshop
See also: Map Books of 2024.
New Leventhal Exhibition: Processing Place
An exhibition exploring the history of computerized mapping, GIS and remote sensing opened at the Boston Public Library’s Leventhal Map Center last Friday. Processing Place: How Computers and Cartographers Redrew our World runs until March 2025.
In the long history of mapmaking, computers are a relatively new development. In some ways, computers have fundamentally changed how cartographers create, interpret, and share spatial data; in others, they simply mark a new chapter in how people have always processed the world. This exhibition features objects from the Leventhal Center’s unique collections in the history of digital mapping to explore how computers and cartographers changed one another, particularly since the 1960s. By comparing maps made with computers to those made before and without them, the exhibition invites us to recognize the impacts of digital mapping for environmental management, law and policy, navigation, national defense, social change, and much more. Visitors will be encouraged to consider how their own understanding of geography might be translated into the encodings and digital representations that are essential to processing place with a computer.
The online version of the exhibition is here.
Thematic Mapping and the 2024 U.K. Election
There’s more than one way to depict data on a map. At the last Esri user conference, Sarah Bell, Kenneth Field and John Nelson demonstrated different ways to map the results of the last U.K. parliamentary election, and how they changed from the previous election. The video of their presentation is attendee-only, but Ken and John have posted about how they each went about their tasks: here’s Ken’s post and here’s John’s; plus, as is his wont, John has posted a video.
A Look Back at the SRTM
Last month NASA Earth Observatory ran a two-part series about the Shuttle Radar Topography Mission, which produced a high-resolution digital elevation model of the Earth based on radar data collected by the shuttle Endeavour in 2000. The first part looks at how Endeavour gathered the data, the second part at how it’s been used.
Nearly a quarter century after the mission to map the world, the SRTM’s data still yields results. Just this year, it aided in wildfire forecasting for Iran’s Zagros Mountains, tracking soil erosion in South Africa, assessing flood risk on the coast of Brazil, and even determining how the locations of power-generating wind turbines affect real estate values. Tens of thousands of research papers are published every year that rely on SRTM maps for these and other environmental, economic, agricultural, and public safety studies.
The Map Men on Gerrymandering
The Map Men look at gerrymandering on U.S. electoral district maps. A reasonably comprehensive primer on the subject even if comes from a couple of Brits baffled by the subject. And they finish with a surprisingly sharp point: gerrymanderers wouldn’t know how to draw maps like these if voting intentions weren’t predictable.
Online Maps Roundup: August 2024
Apple Maps has launched real-time transit information for Tokyo. Meanwhile, MacRumors takes a look at what’s coming to Apple Maps in iOS 18, with an additional look at the upcoming “search here” function. Google and Waze updates announced at the end of the last month: Google Maps gets easier incident reporting and destination guidance (the building you’re heading to is highlighted on the map); Waze upgrades include new camera alerts, event-based (e.g. concerts and sporting events) traffic notification and reporting, and locked-screen navigation. Also, the Google Maps app now has a simplified tab bar. And they’ve changed the pin design too. What can I say: updates are a little less earth-shattering than they used to be.
A History of the Harvard University Institute of Geographical Exploration
“The Harvard University Institute of Geographical Exploration was one of the first and most well-wrought private institutions in aerial photography in the first half of the 20th century. Its short institutional life at Harvard was replete with materials, stories and scandal, and its pieces remain scattered today throughout the Harvard Archives and Libraries system and beyond.” Ana Luiza Nicolae tracks down what records, photos and other materials can still be found on the Harvard campus that once belonged to Alexander H. Rice’s HUIGE, which was not closely affiliated with Harvard’s geography department but was shut down at roughly the same time.