#measurement — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #measurement, aggregated by home.social.
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Goodhart's Law: When a measure becomes a target, it ceases to be a good measure.
-- Charles Goodhart -
Goodhart's Law: When a measure becomes a target, it ceases to be a good measure.
-- Charles Goodhart -
New paper: "Valuation Without ℝ: A Category-Theoretic Foundation for Finite Measurement"
Can measurement be formalized independently of real numbers AND set theory?
We axiomatize "valuation" as a graded distinguishability map satisfying the ultrametric inequality. Dimension emerges as the growth exponent of the distinguishability graph.
Full paper: https://doi.org/10.5281/zenodo.21795656
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From Fragmentation To Integration - A Review Of Data–Model Integration In Land Subsidence Research
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https://doi.org/10.1016/j.ancene.2026.100567 <-- shared paper
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H/T @manonzero current drought conditions, increasing pressure on ecosystems, and ongoing climate adaptation challenges, land subsidence is receiving growing attention worldwide.
For anyone wanting to learn more about land subsidence, or get a refresher, [the authors] provide an overview of the processes involved, the ways it can be measured or estimated, the models used to simulate it, and how observations and models can be combined, [their] new [#openaccess] review paper [link above] may be of interest!
A central message of the paper is that understanding and managing land subsidence requires bringing these different sources of information together…”
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“HIGHLIGHTS:
• Presents a comprehensive synthesis that unifies all major elements of integral land-subsidence research.
• Defines the methodological steps needed for full integration and positions them within the broader challenges posed by subsidence.
• Brings together and distills the key components of data, modelling, and integration into a coherent framework.
ABSTRACT: Land subsidence, the sinking of the Earth’s surface, is a multi-faceted hazard driven by both natural and anthropogenic factors, and poses significant risk to environments, ecosystems, and society. Despite decades of growing research output, substantial gaps persist between investigations on the diversity of causes, reflected in data and model insufficiency. These gaps hinder the understanding of the issue and impede the effectiveness of mitigation measures. Many studies have urged to include all identified subsidence processes acting in a single area in an integral framework, for which a complex analysis has not systematically been outlined before. Therefore, [they] focus here on bridging the gaps between various technical research disciplines involved. [They] stress the urgency for an integral approach that combines observations with subsurface information of all known subsidence processes in an area, and [they] appeal for utilizing them in physics-guided data integrations. Only then can all subsidence drivers be understood, and effective mitigation measures designed. [They] outline the elements for an integral approach in categorical tables and schematized figures, and [they] discuss the main opportunities and challenges in a stepwise workflow. Leveraging these opportunities naturally leads to more robust, scalable, and policy-relevant solutions and fosters a more sustainable future…”
#Land #subsidence #processes #Verticallandmotion #SLR #sealevel #sealevelrise #relativesealevelrise #modeling #data #model #InSAR #elevation #holistic #GIS #spatial #mapping #climate #drought #extremeweather #climatechange #climateadaption #ecosystems #measurement #monitoring #research #review #framework #overview #risk #hazard #anthropogenic #mitigation #engineering #water #hydrology #policy #planning #design #remotesensing #spatialanalysis #spatiotemporal -
From Fragmentation To Integration - A Review Of Data–Model Integration In Land Subsidence Research
--
https://doi.org/10.1016/j.ancene.2026.100567 <-- shared paper
--
H/T @manonzero current drought conditions, increasing pressure on ecosystems, and ongoing climate adaptation challenges, land subsidence is receiving growing attention worldwide.
For anyone wanting to learn more about land subsidence, or get a refresher, [the authors] provide an overview of the processes involved, the ways it can be measured or estimated, the models used to simulate it, and how observations and models can be combined, [their] new [#openaccess] review paper [link above] may be of interest!
A central message of the paper is that understanding and managing land subsidence requires bringing these different sources of information together…”
--
“HIGHLIGHTS:
• Presents a comprehensive synthesis that unifies all major elements of integral land-subsidence research.
• Defines the methodological steps needed for full integration and positions them within the broader challenges posed by subsidence.
• Brings together and distills the key components of data, modelling, and integration into a coherent framework.
ABSTRACT: Land subsidence, the sinking of the Earth’s surface, is a multi-faceted hazard driven by both natural and anthropogenic factors, and poses significant risk to environments, ecosystems, and society. Despite decades of growing research output, substantial gaps persist between investigations on the diversity of causes, reflected in data and model insufficiency. These gaps hinder the understanding of the issue and impede the effectiveness of mitigation measures. Many studies have urged to include all identified subsidence processes acting in a single area in an integral framework, for which a complex analysis has not systematically been outlined before. Therefore, [they] focus here on bridging the gaps between various technical research disciplines involved. [They] stress the urgency for an integral approach that combines observations with subsurface information of all known subsidence processes in an area, and [they] appeal for utilizing them in physics-guided data integrations. Only then can all subsidence drivers be understood, and effective mitigation measures designed. [They] outline the elements for an integral approach in categorical tables and schematized figures, and [they] discuss the main opportunities and challenges in a stepwise workflow. Leveraging these opportunities naturally leads to more robust, scalable, and policy-relevant solutions and fosters a more sustainable future…”
#Land #subsidence #processes #Verticallandmotion #SLR #sealevel #sealevelrise #relativesealevelrise #modeling #data #model #InSAR #elevation #holistic #GIS #spatial #mapping #climate #drought #extremeweather #climatechange #climateadaption #ecosystems #measurement #monitoring #research #review #framework #overview #risk #hazard #anthropogenic #mitigation #engineering #water #hydrology #policy #planning #design #remotesensing #spatialanalysis #spatiotemporal -
ICYMI: Only 16% of brands track AI visibility as IAB sets measurement standard: More than 20 vendors sell AI visibility tools that disagree on the same brand. New IAB rules set out what buyers must be told before trusting any of the data. https://ppc.land/only-16-of-brands-track-ai-visibility-as-iab-sets-measurement-standard/ #AI #Visibility #IAB #Measurement #DigitalMarketing
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ICYMI: Only 16% of brands track AI visibility as IAB sets measurement standard: More than 20 vendors sell AI visibility tools that disagree on the same brand. New IAB rules set out what buyers must be told before trusting any of the data. https://ppc.land/only-16-of-brands-track-ai-visibility-as-iab-sets-measurement-standard/ #AI #Visibility #IAB #Measurement #DigitalMarketing
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EN 13402 is a European standard for size labelling of clothes.
Based on actual body dimensions measured in centimetres, its aim is to make it easier for people to find fitting clothes by ensuring size consistency across brands and countries of origin.
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EN 13402 is a European standard for size labelling of clothes.
Based on actual body dimensions measured in centimetres, its aim is to make it easier for people to find fitting clothes by ensuring size consistency across brands and countries of origin.
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The Clock and The Calendar Didn’t Have to Look Like This
Two of our basic time units are non-negotiable. A day is one rotation of the Earth. A year is one trip around the Sun. Nature hands us these whether we like it or not, no civilisation ever had to invent the day. Everything else - the week, the month, and even the hour, minute, and second - is a human invention layered on top. Nothing in physics requires 24 hours, 60 minutes, or a 7-day cycle. We made all of it up. And the fact that nearly every civilisation independently arrived at something […] -
The Clock and The Calendar Didn’t Have to Look Like This
Two of our basic time units are non-negotiable. A day is one rotation of the Earth. A year is one trip around the Sun. Nature hands us these whether we like it or not, no civilisation ever had to invent the day. Everything else - the week, the month, and even the hour, minute, and second - is a human invention layered on top. Nothing in physics requires 24 hours, 60 minutes, or a 7-day cycle. We made all of it up. And the fact that nearly every civilisation independently arrived at something […] -
Does Measurement Site Matter? A Comparison Between Finger, Forehead, and Toe Pulse Oximetry Measurements in Polysomnography
https://1ban.news/measurement-site-finger-forehead-toe-pulse-oximetry-polysomnography/
#1ban #measurement #site #finger #forehead #sleepBoost if you want more stories like this.
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Data quality defines scientific insight.
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Data quality defines scientific insight.
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Normalized difference water index (Remote sensing 🛰️)
Normalized difference water index may refer to one of at least two remote sensing-derived indexes related to liquid water: One is used to monitor changes in water content of leaves, using near-infrared and short-wave infrared wavelengths, proposed by Gao in 1996: NDWI = ( X n i r − X s ...
https://en.wikipedia.org/wiki/Normalized_difference_water_index
#NormalizedDifferenceWaterIndex #Water #Measurement #RemoteSensing #InfraredSpectroscopy
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Normalized difference water index (Remote sensing 🛰️)
Normalized difference water index may refer to one of at least two remote sensing-derived indexes related to liquid water: One is used to monitor changes in water content of leaves, using near-infrared and short-wave infrared wavelengths, proposed by Gao in 1996: NDWI = ( X n i r − X s ...
https://en.wikipedia.org/wiki/Normalized_difference_water_index
#NormalizedDifferenceWaterIndex #Water #Measurement #RemoteSensing #InfraredSpectroscopy
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The gauge broke: devs felt 20% faster with AI, measured 19% slower
https://intrepidkarthi.com/writing/the-gauge-broke/
#HackerNews #AI #Development #Productivity #Gauge #AI #Performance #Measurement #Developer #Insights
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The gauge broke: devs felt 20% faster with AI, measured 19% slower
https://intrepidkarthi.com/writing/the-gauge-broke/
#HackerNews #AI #Development #Productivity #Gauge #AI #Performance #Measurement #Developer #Insights
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There are two possible outcomes: If the result confirms the hypothesis, then you've made a measurement. If the result is contrary to the hypothesis, then you've made a discovery.
-- Enrico Fermi⬆ #Wisdom #Quotes #EnricoFermi #Discovery #Hypothesis #Measurement
⬇ #Photography #Panorama #ChacoCanyon #PuebloBonito #Ruins #NewMexico
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There are two possible outcomes: If the result confirms the hypothesis, then you've made a measurement. If the result is contrary to the hypothesis, then you've made a discovery.
-- Enrico Fermi⬆ #Wisdom #Quotes #EnricoFermi #Discovery #Hypothesis #Measurement
⬇ #Photography #Panorama #ChacoCanyon #PuebloBonito #Ruins #NewMexico
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#measurement : the action of measuring
- French: Mesure
- German: die Messung
- Italian: misurazione
- Portuguese: medida
- Spanish: medida
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Thank you so much for being a member of our community!
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@maudenificent the article I was looking for: “London: Estimated toxic air-related deaths drop by 40%“
Change can be made; Powerful influencers make sure only negative stories about positive change. Hence it’s “too hard”.
#London / #ULEZ / #CarPollution / #Science / #measurement <https://www.bbc.com/news/articles/czj8v7z1njgo>
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@maudenificent the article I was looking for: “London: Estimated toxic air-related deaths drop by 40%“
Change can be made; Powerful influencers make sure only negative stories about positive change. Hence it’s “too hard”.
#London / #ULEZ / #CarPollution / #Science / #measurement <https://www.bbc.com/news/articles/czj8v7z1njgo>
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NASA's Parker Solar Probe Flew In And Out Of The Solar Corona And Found A Source Of High-Energy Particles That No Existing Model Had Predicted
(When NASA's Parker Solar Probe passed through the solar corona during perihelion encounters at the heliospheric current sheet, its instruments recorded energetic protons at energies far above what existing models of particle acceleration at that location could account for.)
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https://spacedaily.com/n-nasas-parker-solar-probe-flew-in-and-out-of-the-solar-corona-and-found-a-source-of-high-energy-particles-that-no-existing-model-had-predicted/ <-- shared technical article
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https://doi.org/10.3847/2041-8213/ae3ca1 <-- shared paper
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https://www.space.com/high-energy-particles-source-space-weather <-- shared technical article
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https://youtu.be/Woo4yZby4BU?si=rzzND3qJkubGKyTo <-- shared space weather overview effects video, #AIslop notwithstanding 🙃 🫠 😉
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“… A team… at the Southwest Research Institute… and… the University of Maryland’s Institute for Research in Electronics and Applied Physics has published an analysis of those measurements [link above]…, identifying magnetic reconnection at the heliospheric current sheet as the mechanism responsible. The proton energies detected were, in the study’s framing, approximately a thousand times greater than the available magnetic energy per particle that models of this process had predicted.
The finding matters for two reasons: it identifies a source of energetic particles close to the Sun that was not anticipated, and it raises questions about how far the existing understanding of reconnection-driven particle acceleration extends…
The Parker measurements suggest that picture needs revision. The magnetic island merging mechanism [the authors] identif[ied] can evidently produce proton populations at energies that challenge the boundary between what reconnection does and what shock acceleration does. Whether this source can explain a significant fraction of observed near-Earth energetic particle events, or whether it contributes mainly at energies and scales that remain confined close to the Sun, is a question the paper does not yet resolve…
Solar Orbiter, the European Space Agency mission operating in coordination with Parker, offers complementary measurements at somewhat greater distances. Comparing what the two spacecraft measure of the same particle populations as they propagate outward from the Sun will help establish which features originate close to the source and which are modified by the intervening solar wind. The energetic particle observations that puzzled researchers in the pre-Parker era now have a candidate mechanism. Whether that mechanism accounts for a large or small fraction of what actually reaches Earth remains the open question…”
#sun #solar #solarsystem #heliosphere #Parker #SolarOrbiter #spacecraft #research #monitoring #instrumentatin #spaceweather #solarflare #coronalmassejection #CME #NASA #ESA #magnetism #geomagnetism #proton #energy #particleacceleration #measurement #solarwind #risk #hazard #impacts #corona #perihelion #model #modeling
@nasa @esa -
NASA's Parker Solar Probe Flew In And Out Of The Solar Corona And Found A Source Of High-Energy Particles That No Existing Model Had Predicted
(When NASA's Parker Solar Probe passed through the solar corona during perihelion encounters at the heliospheric current sheet, its instruments recorded energetic protons at energies far above what existing models of particle acceleration at that location could account for.)
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https://spacedaily.com/n-nasas-parker-solar-probe-flew-in-and-out-of-the-solar-corona-and-found-a-source-of-high-energy-particles-that-no-existing-model-had-predicted/ <-- shared technical article
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https://doi.org/10.3847/2041-8213/ae3ca1 <-- shared paper
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https://www.space.com/high-energy-particles-source-space-weather <-- shared technical article
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https://youtu.be/Woo4yZby4BU?si=rzzND3qJkubGKyTo <-- shared space weather overview effects video, #AIslop notwithstanding 🙃 🫠 😉
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“… A team… at the Southwest Research Institute… and… the University of Maryland’s Institute for Research in Electronics and Applied Physics has published an analysis of those measurements [link above]…, identifying magnetic reconnection at the heliospheric current sheet as the mechanism responsible. The proton energies detected were, in the study’s framing, approximately a thousand times greater than the available magnetic energy per particle that models of this process had predicted.
The finding matters for two reasons: it identifies a source of energetic particles close to the Sun that was not anticipated, and it raises questions about how far the existing understanding of reconnection-driven particle acceleration extends…
The Parker measurements suggest that picture needs revision. The magnetic island merging mechanism [the authors] identif[ied] can evidently produce proton populations at energies that challenge the boundary between what reconnection does and what shock acceleration does. Whether this source can explain a significant fraction of observed near-Earth energetic particle events, or whether it contributes mainly at energies and scales that remain confined close to the Sun, is a question the paper does not yet resolve…
Solar Orbiter, the European Space Agency mission operating in coordination with Parker, offers complementary measurements at somewhat greater distances. Comparing what the two spacecraft measure of the same particle populations as they propagate outward from the Sun will help establish which features originate close to the source and which are modified by the intervening solar wind. The energetic particle observations that puzzled researchers in the pre-Parker era now have a candidate mechanism. Whether that mechanism accounts for a large or small fraction of what actually reaches Earth remains the open question…”
#sun #solar #solarsystem #heliosphere #Parker #SolarOrbiter #spacecraft #research #monitoring #instrumentatin #spaceweather #solarflare #coronalmassejection #CME #NASA #ESA #magnetism #geomagnetism #proton #energy #particleacceleration #measurement #solarwind #risk #hazard #impacts #corona #perihelion #model #modeling
@nasa @esa -
Just back from measuring our latitude (which I do roughly four times a year) and, for the first time, our longitude.
Latitude was pretty good, got to within about 15 km.
Longitude less good. Got about 6.8 degrees, but the actual value is about 3 degrees.
Wondering what went wrong ... need to think about how to "fix" that.
#Outreach #RecMaths #RecreationalMathematics #Latitude #Longitude #Solstice #Measurement
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Just back from measuring our latitude (which I do roughly four times a year) and, for the first time, our longitude.
Latitude was pretty good, got to within about 15 km.
Longitude less good. Got about 6.8 degrees, but the actual value is about 3 degrees.
Wondering what went wrong ... need to think about how to "fix" that.
#Outreach #RecMaths #RecreationalMathematics #Latitude #Longitude #Solstice #Measurement
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May all your error variances be small ones.
-- David Swanson (G Theory Talk) -
May all your error variances be small ones.
-- David Swanson (G Theory Talk) -
Measuring Arms for Growth 📏
For most people focused on muscle gain, measuring your arms once every 2–4 weeks is ideal.
Measuring Arm size can be a great variation outside of just focusing primarily on bodyweight especially on muscle gain in particular.
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Measuring Arms for Growth 📏
For most people focused on muscle gain, measuring your arms once every 2–4 weeks is ideal.
Measuring Arm size can be a great variation outside of just focusing primarily on bodyweight especially on muscle gain in particular.
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Audio advertising's full-funnel problem: why measurement still holds it back: ExchangeWire's Lindsay Rowntree and Rachel Smith explain why audio cannot prove full-funnel value despite 10% UK spend growth and rising AI investment in 2026. https://ppc.land/audio-advertisings-full-funnel-problem-why-measurement-still-holds-it-back/ #AudioAdvertising #Marketing #Measurement #DigitalMarketing #AIMarketing
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Audio advertising's full-funnel problem: why measurement still holds it back: ExchangeWire's Lindsay Rowntree and Rachel Smith explain why audio cannot prove full-funnel value despite 10% UK spend growth and rising AI investment in 2026. https://ppc.land/audio-advertisings-full-funnel-problem-why-measurement-still-holds-it-back/ #AudioAdvertising #Marketing #Measurement #DigitalMarketing #AIMarketing
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LinkedIn's B2B measurement guide: why 64% of leaders don't trust their own data: LinkedIn published a new B2B measurement guide on June 3, 2026, drawing on Forrester data showing 64% of marketing leaders distrust their own measurement methods. https://ppc.land/linkedins-b2b-measurement-guide-why-64-of-leaders-dont-trust-their-own-data/ #B2BMarketing #DigitalMarketing #DataTrust #MarketingLeaders #Measurement
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LinkedIn's B2B measurement guide: why 64% of leaders don't trust their own data: LinkedIn published a new B2B measurement guide on June 3, 2026, drawing on Forrester data showing 64% of marketing leaders distrust their own measurement methods. https://ppc.land/linkedins-b2b-measurement-guide-why-64-of-leaders-dont-trust-their-own-data/ #B2BMarketing #DigitalMarketing #DataTrust #MarketingLeaders #Measurement
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CW: Long Covid, reflections on identifying & measuring it
Interesting thread from @johnzajac about covid, Long Covid, doctors waving away problems as "aging", etc.
https://dice.camp/@johnzajac/116687038300899112
I don't know if there ever can be conclusive tests for all the varieties & outcomes of Long Covid.
When _I_ had it, it wasn't subtle: from one week to the next, I acquired dysautonomia, heart arrhythmia and exhaustion. (I'm mostly recovered now, 3½ years later.) Those cases are easy to count, if anyone cares.
But like if you have early-onset dementia or kidney damage or something else where the potential causes are multiple, is there really going to be a test which tells you whether covid caused your one or whether you would've got it anyway?
I think those things can sometimes only be identified on a large-scale statistical level.
I.e. you can notice "there are a lot of young people with condition X these days - maybe not coincidence how that line started upward in 2020". But that isn't the same as knowing for definite e.g. "this particular case of X was from the three times they had covid a while back".
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CW: Long Covid, reflections on identifying & measuring it
Interesting thread from @johnzajac about covid, Long Covid, doctors waving away problems as "aging", etc.
https://dice.camp/@johnzajac/116687038300899112
I don't know if there ever can be conclusive tests for all the varieties & outcomes of Long Covid.
When _I_ had it, it wasn't subtle: from one week to the next, I acquired dysautonomia, heart arrhythmia and exhaustion. (I'm mostly recovered now, 3½ years later.) Those cases are easy to count, if anyone cares.
But like if you have early-onset dementia or kidney damage or something else where the potential causes are multiple, is there really going to be a test which tells you whether covid caused your one or whether you would've got it anyway?
I think those things can sometimes only be identified on a large-scale statistical level.
I.e. you can notice "there are a lot of young people with condition X these days - maybe not coincidence how that line started upward in 2020". But that isn't the same as knowing for definite e.g. "this particular case of X was from the three times they had covid a while back".
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European: "So, a two-by-four is ... ?"
North American: "In your terms, 89 by 38 millimeters."
European: "... I see. And that works out to an even number of inches or something?"
North American: "No."
#lumber #dimension #DimensionalLumber #NorthAmerica #Imperial #units #measurement #metric
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European: "So, a two-by-four is ... ?"
North American: "In your terms, 89 by 38 millimeters."
European: "... I see. And that works out to an even number of inches or something?"
North American: "No."
#lumber #dimension #DimensionalLumber #NorthAmerica #Imperial #units #measurement #metric
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The James Webb Space Telescope has just captured the first direct measurement of a black hole 50 million times the mass of the Sun, sitting in an ancient galaxy where it outweighs every star around it — suggesting it may have formed first
https://atlas.whatip.xyz/post.php?slug=the-james-webb-space-telescope-has-just-captured-the-first-direct-measurement-of-a-black-hole-50-million-times-the-mass-of-the-sun-sitting-in-an-ancient-galaxy-where-it-outweighs-every-star-around-it-suggesting-it-may-have-formed-first
<p>According to the official ESA Webb announcement on 27 May 2026
#measurement #direct #black #james -
@mho
Sieht halt nur das Fediverse mit #LegacyIPDas Fediverse ist viel grösser!
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@mho
Sieht halt nur das Fediverse mit #LegacyIPDas Fediverse ist viel grösser!
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Modern Scientific Measurements Fundamentally Depend on Comparison and Counting
📰 Original title: All the Fancy Measuring Devices Used in Science Rely on Two Stone-Age Techniques
🤖 IA: It's clickbait ⚠️
👥 Users: It's clickbait ⚠️View full AI summary: https://en.killbait.com/modern-scientific-measurements-fundamentally-depend-on-comparison-and-counting.html?utm_source=mastodon_world&utm_medium=social&utm_campaign=killbait.mastodon_world
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Modern Scientific Measurements Fundamentally Depend on Comparison and Counting
📰 Original title: All the Fancy Measuring Devices Used in Science Rely on Two Stone-Age Techniques
🤖 IA: It's clickbait ⚠️
👥 Users: It's clickbait ⚠️View full AI summary: https://en.killbait.com/modern-scientific-measurements-fundamentally-depend-on-comparison-and-counting.html?utm_source=mastodon_social&utm_medium=social&utm_campaign=killbait.mastodon_social
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This year's theme emphasises the that accurate, internationally recognised measurements provide the vital, objective scientific evidence that governments need to make informed, transparent, and enforceable public policies.
#worldmetrologyday #metrology #metreconvention #measurements #measurement #measurementscience #internationalsystemofunits #systèmeinternationaldunités #metricsystem #raiseawareness #raisingawareness #sofiaflorina #ソフィアフロリナ
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Happy World Metrology Day, 20 May, 2026. 2026 Theme: "Metrology: Building Trust in Policy Making". This year, we celebrate the 151st anniversary of the signing of the Metre Convention - a milestone that underscores a century and a half of international collaboration in measurement science.
#worldmetrologyday #metrology #metreconvention #measurements #measurement #internationalsystemofunits #systèmeinternationaldunités #metricsystem #raiseawareness #raisingawareness #sofiaflorina #ソフィアフロリナ
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Points are a weird and inconsistent unit of measure
https://buttondown.com/hillelwayne/archive/points-are-a-weird-and-inconsistent-unit-of/
#HackerNews #points #measurement #unit #inconsistencies #design #typography
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Points are a weird and inconsistent unit of measure
https://buttondown.com/hillelwayne/archive/points-are-a-weird-and-inconsistent-unit-of/
#HackerNews #points #measurement #unit #inconsistencies #design #typography
