Chinmay Shaligram (@chinmaymaps) header
Chinmay Shaligram (@chinmaymaps) profile picture

Building @terrahelix_tech, herding @geopune. Interests include geospatial, climate, history and the environment.

Pune, India
Joined July 2009
Photo by Chinmay Shaligram (@chinmaymaps)Photo by Chinmay Shaligram (@chinmaymaps)Photo by Chinmay Shaligram (@chinmaymaps)Photo by Chinmay Shaligram (@chinmaymaps)Photo by Chinmay Shaligram (@chinmaymaps)Photo by Chinmay Shaligram (@chinmaymaps)Photo by Chinmay Shaligram (@chinmaymaps)Photo by Chinmay Shaligram (@chinmaymaps)Photo by Chinmay Shaligram (@chinmaymaps)Photo by Chinmay Shaligram (@chinmaymaps)
Chinmay Shaligram retweeted
El Nino years see high intensity 24hrs rain in Pune in november Among top 10 highest 24hrs rain event in November, 7 occured during El Nino year. This 7 events are 95mm (2015) 93.8mm (2009) 75.4mm (1997) 52.3 (2019) 42.6mm (2009) 41.1mm (2026) 37mm (2009) data: IMD #punerains
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And this is why we love Windscribe
Replying to @pubity
Fuck that guy
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Chinmay Shaligram retweeted
This is awful!! Separate elavators for domestic staff/labourers/cleaners/food delivery persons and also separate cups and utensils for domestic help - only in India, and the reason is obvious 🙁
Casteism + Classism + Apartheid = Indian gated societies.
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Chinmay Shaligram retweeted
Still a long way out, but Landsat 10 is coming with an expected launch of 2031 - NASA and USGS plan 26 spectral bands at 10-60 m for the next chapter of the Landsat record! This official graphic shows how the band stack grows compared to Landsat 8 & 9. Heritage bands stay for continuity, Sentinel-2 comparable bands are added, and new ones are built for emerging uses like snow cover and ice melt, crop water use and harmful algal blooms. Under the hood there is also a new reference system (WRS-3) with 265 orbits instead of 233, and an 18-day minimum revisit. 𝐒𝐨𝐮𝐫𝐜𝐞: science.nasa.gov/mission/lan… 𝐒𝐚𝐭𝐞𝐥𝐥𝐢𝐭𝐞 𝐃𝐚𝐭𝐚 𝐒𝐜𝐢𝐞𝐧𝐜𝐞 𝐢𝐧 𝐏𝐲𝐭𝐡𝐨𝐧 - janosovm.gumroad.com/l/qsxao… 𝐓𝐡𝐞 𝐍𝐞𝐰 𝐒𝐜𝐢𝐞𝐧𝐜𝐞 𝐨𝐟 𝐌𝐚𝐩𝐬 - thenewscienceofmaps.com/
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Chinmay Shaligram retweeted
SIR PATRICK STEWART (1940-2026) Before everything else, Patrick was defined by being born and bred in Yorkshire, the proud county in the north of England which he loved to the end. You could hear it in his accented voice and in the stern honesty with which he told you what he thought and felt. Yorkshiremen have no truck with half-truths or avoidance of big issues. He wore his heart on his sleeve, which made him a man to rely on, to admire and in my case, love. We first met as ambitious young actors with the Royal Shakespeare Company half a century ago but we weren’t in the same productions. My first strong memory was a few years later, meeting him in the street in central London when he told me about an offer to take over a leading part in 'Star Trek'. “But Patrick think of your stage career in the UK. Do you really want to risk—getting lost in Hollywood for years and years?”. Well, he took the risk and thank goodness for us all that he did for not just his devoted Trekkies but film and theatre audiences, who marvelled at his using international celebrity to star in a string of cinema successes ('X-Men' of course) and in great classical plays by Shakespeare, Ibsen, Arthur Miller, Peter Shaffer, Pinter and Beckett at Stratford-upon-Avon, in London’s West End and on Broadway. America was his adopted home, where he met his adored Sunny who has cared for him through sickness and health, through thick and thin. But he never forsook his origins: and the proudest achievement of the most respected and beloved actor of his generation on either side of the Atlantic, was his appointment as Chancellor of Huddersfield University in Yorkshire. His farewell performance in 'Avengers: Doomsday' is yet to be seen. Ian McKellen 29 October 2026 Photo: University of Huddersfield
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Chinmay Shaligram retweeted
OHHHHH MY GOOOOOD 🤯🤯🤯 INDIA BEATS NEW ZEALAND IN RUGBY 🏉 7£ 🤯🤯🥳😍😍💥 YES You read it right Our U20 Women's Rugby Team made history beating 🇳🇿 U20 by 17-0 💥🔥 What a historic evening for Indian Rugby to win a match against New Zealand Rugby Side 👏🏻👏🏻 Let's Gooo 🔥
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Chinmay Shaligram retweeted
The deliberate weakening of BEST and PMPML bus services to benefit a select few. @BJP4PuneFreeBus @myBESTBus @PMPMLPune @MAHA_UDD
The systematic dismantling of Mumbai's BEST bus network. Mumbai's iconic BEST bus service is collapsing by design, not by accident. Stripped of its historical cross-subsidy funding, the BMC pushed this essential transit system into a dangerous wet-leasing privatization model. This shift forces extreme contractor cost-cutting on labor and maintenance, directly driving the recent surge in bus accidents and breakdowns. While the BMC easily allocates tens of thousands of crores for elite coastal road infrastructure, it actively refuses to merge budgets to protect the daily commute of millions. The decline of Mumbai's most vital public transport is a deliberate policy choice prioritizing profit over public utility. @hussaindorewala youtu.be/vqCuTsZqww0?si=m7sA…
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Not really that hard to use OpenStreetMap AND use SOI boundaries. This is just lazy engineering.
Map Used by a Chinese Company in India🗿 VS Map Used by an Indian Company in India 🤡
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Wonderful explainer of you’re wondering about the whole ETH thing that’s floating around this week.
Many of you don't understand how serious this is, so let me break it down. In computer science there is a famous kind of puzzle called 3-SAT. You are given a long list of yes-or-no switches and a set of rules about how they must be arranged, and you have to find a combination that satisfies every rule. The obvious way to solve it is to try every combination, but each new switch doubles the number of possibilities, so a puzzle with a few hundred switches would take longer than the age of the universe to brute force. For decades, the smartest people in the field found clever tricks that made this a little faster, but every trick still hit the same wall: the time required kept exploding as the puzzle grew. About 25 years ago, two computer scientists, Russell Impagliazzo and Ramamohan Paturi, working with Francis Zane, turned that wall into a formal idea. They proposed the Exponential Time Hypothesis, which says this explosion is not a failure of human cleverness but a law of nature. No algorithm, however brilliant, will ever solve 3-SAT without the time blowing up exponentially. Nobody could prove it, but almost everyone believed it, and it became one of the foundations of modern computer science. Researchers used it as a measuring stick. If you could show that solving some other problem quickly would also crack 3-SAT quickly, you had shown that problem was hopelessly hard too. Hundreds of papers, across scheduling, graphs, logic and much more, rest on this one assumption. Now an internal AI model at OpenAI claims to have broken it. It says it found an algorithm that solves these puzzles meaningfully faster than the hypothesis allows, and it has checked the proof in a computer verification system called Lean. And here is the remarkable part: the very people who proposed the hypothesis, Impagliazzo and Paturi, along with MIT's Ryan Williams, are now leading the public review of whether a machine has disproved their own idea. So what happens next? If the disproof holds, a large part of theoretical computer science has to be revisited. Every result that said "this problem cannot be solved faster, assuming ETH" loses its foundation, and researchers will have to work out which of those walls were real and which were simply where we stopped looking. It does not mean everything becomes easy. The new algorithm is still slow in absolute terms and this is not the famous P versus NP problem being solved. But it means our map of what is possible was wrong in a place we were very confident about, and it was an AI that redrew it. If the disproof fails, the hypothesis survives and the field breathes out, but we will still have watched an AI produce serious, checkable work on one of the deepest questions in the discipline, closely enough that the founders of the idea had to take it seriously. Either way, something has shifted.
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Chinmay Shaligram retweeted
Many of you don't understand how serious this is, so let me break it down. In computer science there is a famous kind of puzzle called 3-SAT. You are given a long list of yes-or-no switches and a set of rules about how they must be arranged, and you have to find a combination that satisfies every rule. The obvious way to solve it is to try every combination, but each new switch doubles the number of possibilities, so a puzzle with a few hundred switches would take longer than the age of the universe to brute force. For decades, the smartest people in the field found clever tricks that made this a little faster, but every trick still hit the same wall: the time required kept exploding as the puzzle grew. About 25 years ago, two computer scientists, Russell Impagliazzo and Ramamohan Paturi, working with Francis Zane, turned that wall into a formal idea. They proposed the Exponential Time Hypothesis, which says this explosion is not a failure of human cleverness but a law of nature. No algorithm, however brilliant, will ever solve 3-SAT without the time blowing up exponentially. Nobody could prove it, but almost everyone believed it, and it became one of the foundations of modern computer science. Researchers used it as a measuring stick. If you could show that solving some other problem quickly would also crack 3-SAT quickly, you had shown that problem was hopelessly hard too. Hundreds of papers, across scheduling, graphs, logic and much more, rest on this one assumption. Now an internal AI model at OpenAI claims to have broken it. It says it found an algorithm that solves these puzzles meaningfully faster than the hypothesis allows, and it has checked the proof in a computer verification system called Lean. And here is the remarkable part: the very people who proposed the hypothesis, Impagliazzo and Paturi, along with MIT's Ryan Williams, are now leading the public review of whether a machine has disproved their own idea. So what happens next? If the disproof holds, a large part of theoretical computer science has to be revisited. Every result that said "this problem cannot be solved faster, assuming ETH" loses its foundation, and researchers will have to work out which of those walls were real and which were simply where we stopped looking. It does not mean everything becomes easy. The new algorithm is still slow in absolute terms and this is not the famous P versus NP problem being solved. But it means our map of what is possible was wrong in a place we were very confident about, and it was an AI that redrew it. If the disproof fails, the hypothesis survives and the field breathes out, but we will still have watched an AI produce serious, checkable work on one of the deepest questions in the discipline, closely enough that the founders of the idea had to take it seriously. Either way, something has shifted.
An internal model at OpenAI has produced a claimed refutation of ETH! Russell Impagliazzo, Mohan Paturi, and I have been asked to help organize an open and independent examination of this claim. 1/4
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Chinmay Shaligram retweeted
How is the internet less private than in 2006, when the whole family shared one computer? Back then, the internet was weird, personal, and all of ours. So, we got your favorite meme legends back together to say it louder: What happened to the internet? 1/3
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Chinmay Shaligram retweeted
Serbia just voted out the party that held power for 14 years under authoritarian rule. People organized, showed up, and won. America, this could be us next week!
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Brazilian President Luiz Inácio Lula da Silva defeats far-right challenger Flávio Bolsonaro to win a historic fourth term.
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Happy to see traffic police out and about on the streets, y’know… policing. Hopefully a sign of change in policy?
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Chinmay Shaligram retweeted
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On one hand they make ugly af public infrastructure and concrete roads and then point the finger at drying clothes.
PMC is planning to ban drying clothes on balconies to “improve the aesthetics” of the city! 🙈
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Chinmay Shaligram retweeted
Everyone who owns hardware with abominable software (like Sonos players) owes a debt of gratitude to Venkatraman Srinivasan and the rest of the eMudhra gang in Bengaluru, Karnataka. Without their gross negligence, it'd be a lot harder to counterfeit certificates and fix the sw🙏
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Chinmay Shaligram retweeted
Breaking News! Code UFB!!! It takes 2 weeks to confirm ocean sea surface temperatures and the long wait is finally over. The first day in recorded history with Nino 3.4 SST at or above 30.0°C is now officially on the record. October 7, 2026: 30.000°C. climatereanalyzer.org/clim/s…
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