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Dónal

@pearoid

Urban Planning, GIS and Cartography musings www.spatialoverlay.xyz

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18.10.2023
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Latest posts by Dónal @pearoid

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NASA Scientific Visualization Studio | Global Views of ICESat-2 Data ICESat-2 data products on a rotating Earth. Together they illustrate the satellite’s measurements of Earth’s land, ice, oceans, forests, and atmosphere.

This breathtaking visualisation from @thenasaearth.bsky.social's shows how the ICESat-2 laser altimeter has provided us with a staggering amount of geodetic information for Earth allowing us to track vital signs svs.gsfc.nasa.gov/5616

10.03.2026 15:09 👍 17 🔁 5 💬 0 📌 0
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Where the F*** Are We? - 99% Invisible Just off the southwestern coast of the United Kingdom, the Isles of Scilly form a jagged, treacherous archipelago that has claimed hundreds of ships. The most infamous of these disasters unfolded on a...

Didn't learn anything new but still a very enjoyable episode: 99percentinvisible.org/episode/661-...

05.03.2026 00:22 👍 0 🔁 0 💬 0 📌 0
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Here's a brief cartographic exploration of Brittany's resident population by age, using Eurostat gridded data at 1km resolution ! Thread: ↪️
#map #gis #demography #gischat #cartography

25.01.2026 17:56 👍 10 🔁 7 💬 1 📌 0
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Géographie des bibliothèques en France
L'Atlas des bibliothèques territoriales (Ministère de la Culture, 2024) fournit des cartes et des données très utiles pour dessiner une géographie des bibliothèques et des points d'accès aux livres en France
cartonumerique.blogspot.com/2026/02/geog...
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23.02.2026 07:55 👍 25 🔁 11 💬 1 📌 2

Me writing an email: “AI makes mistakes, check your work.”

Department of Defense: “When if we hooked it up to a machine gun”

28.02.2026 05:26 👍 138 🔁 27 💬 7 📌 1
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Proximity to nuclear power plants associated with increased cancer mortality | Harvard T.H. Chan School of Public Health U.S. counties located closer to operational nuclear power plants have higher rates of cancer mortality than those located farther away, according to a new Harvard Chan School study.

The researchers estimated that over the course of the study period, roughly 115,000 cancer deaths across the U.S. (or about 6,400 deaths per year) were attributable to proximity to Nuclear Power Plants.

hsph.harvard.edu/news/proximi...

24.02.2026 23:50 👍 29 🔁 20 💬 2 📌 5

Why do I have to pretend that I'm going to print something in order to save it as a PDF. Why do I have to engage in a little ruse.

23.02.2026 21:43 👍 19302 🔁 2927 💬 345 📌 1

Very nicely done, looks epic!

23.02.2026 07:23 👍 0 🔁 0 💬 0 📌 0
A frame with two 3D printed relief maps of Rhode Island and the Rhode Island Salt Ponds, which are being backlit from within the frame

A frame with two 3D printed relief maps of Rhode Island and the Rhode Island Salt Ponds, which are being backlit from within the frame

A closeup of the backlit Rhode Island/surrounding ocean relief map

A closeup of the backlit Rhode Island/surrounding ocean relief map

A closeup of the backlit Salt Ponds relief map

A closeup of the backlit Salt Ponds relief map

wanted to share a little about a 3D printing/electronics project that I finished recently as a gift: this light-up relief map of Rhode Island and its Salt Ponds

22.02.2026 21:00 👍 15 🔁 1 💬 3 📌 0
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The Mapper Capturing Decades of Earth’s History Through 1,000+ Maps Discover how mapper Harry Stranger "SpaceFromSpace" has uploaded over 1,000 maps to Soar, including rare satellite imagery from the 1960s. Explore how his passion helps preserve Earth’s history for ev...

This massive milestone continues to inspire our whole team. Harry’s work has made data more accessible, explorable, and easy to understand.

We’re honored to work alongside him in our shared mission to make maps of all kinds more interesting to explore.

about.soaratlas.com/blogs/the-ma...

20.02.2026 05:46 👍 4 🔁 1 💬 0 📌 0

Very cool and so easy to access/navigate

19.02.2026 23:07 👍 1 🔁 0 💬 1 📌 0
A large mosaic of 700 thumbnails of declassified spy satellite images on spacefromspace.com

A large mosaic of 700 thumbnails of declassified spy satellite images on spacefromspace.com

A screenshot of a dark world map with many coloured outlines representing the areas covered by satellite images on spacefromspace.com.

A screenshot of a dark world map with many coloured outlines representing the areas covered by satellite images on spacefromspace.com.

spacefromspace.com/declassified... is now home to over 700 georeferenced spy satellite images of locations all over the world taken between 1960 and 1984!

I've also published a new, very experimental, map view search method for all images available on the website: spacefromspace.com/declassified...

19.02.2026 11:01 👍 28 🔁 12 💬 3 📌 2
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Tout quitter et partir en Irlande 🇮🇪

13.02.2026 16:09 👍 91 🔁 28 💬 17 📌 3
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Great piece from @dsquareddigest.bsky.social, which touches on one of the big theories for why English-speaking countries do especially badly at housebuilding:

Adversarial and litigious common law systems (Anglo) vs judge-led civil law systems elsewhere.

samf.substack.com/p/build-the-...

16.02.2026 12:13 👍 1038 🔁 373 💬 46 📌 75
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Sam Altman on X: "Peter Steinberger is joining OpenAI to drive the next generation of personal agents. He is a genius with a lot of amazing ideas about the future of very smart agents interacting with each other to do very useful things for people. We expect this will quickly become core to our" / X Peter Steinberger is joining OpenAI to drive the next generation of personal agents. He is a genius with a lot of amazing ideas about the future of very smart agents interacting with each other to do very useful things for people. We expect this will quickly become core to our

OpenAI hired the openclaw guy.

15.02.2026 23:20 👍 4 🔁 2 💬 0 📌 0
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A special FT magazine issue all about maps is out today, w great pieces by @okr.bsky.social and @theboysmithy.ft.com, plus maps by me on how glacial melt is redrawing Alpine borders, the battle to redraw America and more

Read it online here (though best enjoyed in print!) www.ft.com/content/efab...

14.02.2026 12:22 👍 53 🔁 22 💬 1 📌 2
A lexis diagram - essentially a heatmap showing rates of death from transport accidents by age and over time from 2001-2024 in Scotland. For men in the 2000s there was a clear peak in deaths at ages 15-35 (plus a smaller one in the oldest age groups). But around 2010 this basically disappeared, and now all age groups have similarly, much lower, rates of transport accident deaths. For women the pattern is similar, albeit at a much lower level, except that in the early 2000s there were more deaths in older, rather than younger adults.

A lexis diagram - essentially a heatmap showing rates of death from transport accidents by age and over time from 2001-2024 in Scotland. For men in the 2000s there was a clear peak in deaths at ages 15-35 (plus a smaller one in the oldest age groups). But around 2010 this basically disappeared, and now all age groups have similarly, much lower, rates of transport accident deaths. For women the pattern is similar, albeit at a much lower level, except that in the early 2000s there were more deaths in older, rather than younger adults.

I was looking at some Scottish cause of death data yesterday and the extent to which transport accident deaths in young men have all but disappeared is pretty remarkable.

Nice to find a good news story in this data for a change.

16.10.2025 07:49 👍 83 🔁 22 💬 10 📌 3
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Very fond of this Mr Hyde by Grickle, look at that lovely Mr Hyde face

09.02.2026 23:11 👍 6763 🔁 769 💬 77 📌 21
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Do maps distort our view of the world? William Rankin’s ‘Radical Cartography’ makes a powerful case against mainstream mapmaking’s creation of an orderly, objective reality

Good review of what seems to be a very interesting book that I must pick up: www.ft.com/content/06db...

05.02.2026 23:01 👍 0 🔁 0 💬 0 📌 0

Very nice!

04.02.2026 23:32 👍 0 🔁 0 💬 0 📌 0
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¿De dónde son tus vecinos? El mapa calle a calle de los extranjeros Uno de cada cinco habitantes de España nació en otro país. EL PAÍS visualiza sus orígenes sobre un mapa extremadamente detallado, desde los europeos en la costa a los americanos en las grandes ciudade...

Un Espagnol sur cinq est né à l'étranger. Le journal EL PAÍS visualise leurs origines sur une carte extrêmement détaillée, des Européens du littoral aux Américains des grandes villes
elpais.com/espana/2026-...

02.02.2026 14:53 👍 2 🔁 2 💬 0 📌 0

Coming soon: Hyperscalers roll out new mud-covered roofs for their data centers to hide their thermal signatures like Schwarzenegger in Predator

02.02.2026 21:17 👍 7 🔁 2 💬 0 📌 0

Wow, such a clear pattern and an excellent way you've visualised it!

30.01.2026 00:11 👍 1 🔁 0 💬 0 📌 0
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This #map title could be "Retirement with a sea view in Belgium".
See online version on Eurostat website: tinyurl.com/2ps59n6a

29.01.2026 16:08 👍 34 🔁 10 💬 1 📌 2
These images from 15 December 2025 show Earth’s atmosphere in terms of temperature and humidity — data that will support more accurate weather forecasting, especially for nowcasting rapidly evolving storms.

These images from 15 December 2025 show Earth’s atmosphere in terms of temperature and humidity — data that will support more accurate weather forecasting, especially for nowcasting rapidly evolving storms.

These images from 15 December 2025 show Earth’s atmosphere in terms of temperature and humidity — data that will support more accurate weather forecasting, especially for nowcasting rapidly evolving storms.

These images from 15 December 2025 show Earth’s atmosphere in terms of temperature and humidity — data that will support more accurate weather forecasting, especially for nowcasting rapidly evolving storms.

📸 The first official images from @eumetsat.int's MTG-S1 satellite are in 👀

🔗 esa.int/Applications/Observing_the_Earth/Meteorological_missions/meteosat_third_generation/Europe_s_next-generation_weather_satellite_sends_back_first_images

@thalesaleniaspace.bsky.social

27.01.2026 10:30 👍 158 🔁 25 💬 0 📌 5
Drone shot of Qeqertaq Avannarleq (Martin Nissen, 2021) . Source: Arctic Today.

Drone shot of Qeqertaq Avannarleq (Martin Nissen, 2021) . Source: Arctic Today.

For a brief time in 2021, the northernmost land in the world was considered to be the newly discovered island of Qeqertaq Avannarleq north of Greenland.

But it would soon be revealed that it was just an iceberg.

23.01.2026 09:49 👍 2 🔁 1 💬 2 📌 0

Haha, love it

16.01.2026 01:21 👍 0 🔁 0 💬 0 📌 0
Multivariate map of Canada showing environmental vulnerabilities – biodiversity loss, water stress, soil degradation, and deforestation – alongside accumulated climate events from the past several years – including floods, wildfires, long-term sea level rise, and droughts. The map combines these eight impacts via small pie charts, that when combined represent the intensity of climate-change risks.

Multivariate map of Canada showing environmental vulnerabilities – biodiversity loss, water stress, soil degradation, and deforestation – alongside accumulated climate events from the past several years – including floods, wildfires, long-term sea level rise, and droughts. The map combines these eight impacts via small pie charts, that when combined represent the intensity of climate-change risks.

Eight small maps of Canada arranged in a grid showing climate change vulnerabilities – biodiversity loss, water stress, soil degradation, and deforestation – alongside accumulated climate events from the past several years – including floods, wildfires, long-term sea level rise, and droughts

Eight small maps of Canada arranged in a grid showing climate change vulnerabilities – biodiversity loss, water stress, soil degradation, and deforestation – alongside accumulated climate events from the past several years – including floods, wildfires, long-term sea level rise, and droughts

couple interesting maps of climate change vulnerability across Canada by Isabeaux Graham on our team

check out more here: schoolofcities.utoronto.ca/layers-of-cl...

#maps #gis #canada #climateChange

14.01.2026 21:23 👍 15 🔁 3 💬 0 📌 0

That is really cool!

15.01.2026 08:47 👍 0 🔁 0 💬 0 📌 0

That is really cool!

15.01.2026 08:47 👍 0 🔁 0 💬 0 📌 0