TC (Tirthankar Chakraborty) @TC_Chakraborty Twitter profile | Pikagi

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TC (Tirthankar Chakraborty)

@TC_Chakraborty

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Scientist at @PNNLab ; @Yale PhD '21 | earth science | remote sensing | urban climate | aerosols | Earth Engine | geospatial | ML | Personal opinions abound.

Richland, WA

https://t.co/yeVt6jcCvr

Joined August 2009

Don't wanna be here? Send us removal request.

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

9 months

I am pleased (more like absolutely flabbergasted) to announce that I got the @doescience Early Career Award for my proposal on improving #urban representation in Earth system models. The staggering amount of support from folks at @PNNLab definitely loaded the dice in my favor.

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

1 year

This paper (), which I co-authored, has recently been shared by multiple #climatechange denier accounts on #Twitter as evidence of the impact of #urban #heat islands on long-term observed #warming . Except the paper does not show that. Let's discuss: [1/n]

Surface warming in global cities is substantially more rapid than in rural background areas

Communications Earth & Environment - The rate of surface warming in cities exceeds that in rural areas, but urban greening can partly offset enhanced urban warming that is driven by climate...

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

2 years

Being introduced to #EarthEngine back in 2016 was a game changer. In my first project, I created a #global surface #urban #heat island database. We just updated it to version 5 with estimates through 2020. Here is the web app to explore the data: #EOChat

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

2 years

Thermal #remotesensing is poorly constrained for #urban use cases. Quantitative estimates are sensitive to the land surface #temperature (LST) retrieval algorithm used. See spatial variability of LST for summer 2019 from two algorithms over Philadelphia. #EarthEngine #EOChat

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

11 months

🚨Just published in #RemoteSensing of #Environment (), we reconstruct spatiotemporally continuous #Landsat land surface temperature (LST) for 1985–2020 over 511 #cities , finding a mean surface urban heat island (Is) growth rate of 0.156 °C/decade. [1/n]

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

2 years

@techleadhd Now you can make a video whining about it (as a millionaire).

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

8 months

Our #global surface #urban #heat island (SUHI) dataset is finally available through @NASA 's SEDAC @ciesin : Includes annual, summertime, and wintertime SUHI intensities for daytime and nighttime for over 10,000 urban extents throughout the world.

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

4 years

I recently updated the Beginner's Cookbook to #EarthEngine , intended to be an introductory tutorial to geospatial analysis: Changes include an additional section on Reducers and easier to follow steps for the example scripts.

Beginner's Cookbook | Google Earth Engine | Google for Developers

developers.google.com

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

9 months

Note the large differences between what #satellite -derived land surface #temperature gives us and the true variability in mean radiant temperature within and across neighborhoods in Philadelphia. Read the paper for more details: #UrbanClimate

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@GIS_jiang

Xiaojiang Li

9 months

Cities are suffering from heat. If you still use land surface temperature in your study, you should read this paper. LST is not equal to human heat stress, because people don’t live on building and tree tops. ⁦ @TC_Chakraborty ⁩ ⁦ @biometeors ⁩ .

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

5 months

Got my copy of #EarthEngine @EEFAbook on cloud-based #remotesensing ; result of a massive community effort. Also, papers are nice & all, but since the majority of my education has relied on books, feels awesome to see my name as a chapter author (on #urban #heatisland ) in print.

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

9 months

Looking to hire 2 #postdocs for my recently funded DOE early career project. One will work on #remotesensing + #machinelearning : The other on #urban #model development: Salary: $73k - $80k Can be on-site or virtual. Please share!

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

4 months

2023 was stupidly productive. Got the DOE Early Career award+first NASA funding, published 15 papers (led 2 of them; wish this was higher), presented at 5 conferences (+universities & national labs), reviewed ~100 papers & 2 proposals, & added >800 citations. I may have peaked.

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

7 months

I will be giving an online training on mapping #urban #heat using #EarthObservations tomorrow for UN- #Space . The training will use #EarthEngine & material from the chapter I authored on heat islands for the recently published #openaccess @EEFAbook .

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@UNOOSA

UNOOSA

7 months

Starting tomorrow, @UN programmes, funds, agencies and offices are gathering in #Brindisi to strengthen inter-agency cooperation on #space . New this year is a full day devoted to training on applications and demonstrations of #technologies , thanks to cooperation with @CEOSdotORG .

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

1 year

@brianmlucey @NathanCAGray The hungry hunter analogy is particularly cringe-inducing since you are in finance and your research involves sitting (and probably eating) in front of a computer.

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

1 year

The surface #urbanheat island #disparity explorer #app has been updated. In most #US #urban areas, #satellite -derived surface #temperature is higher in #census tracts with #poorer and more non-white residents. Explore data here: #GisChat #EarthEngine

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

1 month

There has been a plethora of studies that use #satellite -derived land surface #temperature (LST) to estimate the cooling efficiency of #trees , particularly #urban trees. 📢In our recent #openaccess paper in #ERL , we show that this approach leads to massive overestimations. [1/n]

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

3 years

I am pleased to announce that I will be joining the Atmospheric Sciences and Global Change Division of the Pacific Northwest National Lab as a Research Scientist this fall.

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

10 months

The discourse around #heatstress sucks both on #Twitter & in the #media . It is hot and it will get hotter (human-caused #ClimateChange +El Niño has a role this year). But all metrics that include #temperature are not same. See their magnitude & variability in this figure. 🧵...

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

2 years

Have been exploring #urban roughness elements (building and vegetation height) at 30 m using #Copernicus COPDEM30 and FABDEM datasets on #EarthEngine . Really interesting and has a bunch of applications. Code: Thanks for ingesting these, @samapriyaroy

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

10 months

📣In our recent paper () in @ametsoc #BulletinAMS , we rank the hottest and coldest #cities in the world (by air #temperature & thermal discomfort) by combining multiple ground-based, #satellite , and reanalysis datasets with #MachineLearning models. [1/n]

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

1 year

In case anyone is using both products, the change in algorithm between @ESA #WorldCover2020 and #WorldCover2021 will probably contribute more to 'urbanization' than any actual change between the years. I used this #EarthEngine app () to compare. #EOChat

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

10 months

There seem to be a confidence estimates for every building polygon (green polygons have a confidence score greater than equal to 0.9). That is awesome.

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

10 months

I haven't played around enough with the data to comment on overall accuracy, but they provide precision scores per tile, which is very useful. Good to see uncertainty estimates for these large-scale estimates from data producers. #Google #OpenBuildings

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

1 year

Last year, @WHO revised #airquality standards after 15 years. So now, 99.58% of us live in areas with annual average PM2.5 values above the recommended 5 µg/m3. 🤷‍♂️ I made an #EarthEngine #app to explore how many times higher than that standard the actual concentrations are.

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

3 years

2020's last #EarthEngineVirtualMeetup : "Google Earth Engine open-source code for Land Surface Temperature estimation from the Landsat series" by @ermida_sofia #EarthEngine #Landsat On Wednesday, December 23, 2020 1 PM EST Here is the associated paper:

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Google Earth Engine Open-Source Code for Land Surface Temperature Estimation from the Landsat Series

Land Surface Temperature (LST) is increasingly important for various studies assessing land surface conditions, e.g., studies of urban climate, evapotranspiration, and vegetation stress. The Landsat...

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

2 years

The evolution of the #heatwave in #India since the beginning of March from daily 🛰️observations of land surface #temperature from #NASA 's #MODIS sensor. Given current trajectories, things will continue to get worse in the future. #GoogleEarthEngine #EOChat #geemap

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

4 months

#Clouds kind of suck; a constant source of annoyance for #satellite #remotesensing . In our recently published #openaccess paper, we show that the reliance on clear-sky estimates of land surface #temperature leads to overestimated surface #urban #heat island intensities. [1/n]

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

7 months

There are several #urban extent datasets based on various #global estimates of urbanization. How does the choice of urban extent impact estimates of surface #urban #heat island (SUHI)? We answer this question in our recently published paper: [1/n]

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

3 years

Ignoring urban surface meteorology is the norm from a climatological perspective, but urban micro-climate is important for people living and working in cities. Need more urban surface observations as remotely sensed, derived, and modeled products perform quite poorly over cities.

@tornatrix

Dr. Robin Tanamachi @tornatrix.bsky.social 🌪📡

3 years

This is why we don't put surface observing stations in major cities: The buildings modify the air flow! Clearest demonstration I've yet seen of this concept. Source:

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

8 months

In our #openaccess paper () in @IOPenvironment Infrastructure & Sustainability, we use #satellite data & #machinelearning (trained using #citizenscience data) to create spatially continuous maps of air #temperature , humidity, & moist #heatstress . [1/n]

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

2 years

🚨Our paper @AguAdvances shows strong decoupling of #urban #heatstress from surface temperature, often used to study #heat impacts, during a #heatwave : Moreover, lower urban #humidity partly offsets urban warming impact on #heatstress across scales. [1/n]

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

4 years

The Beginner's Cookbook for using #EarthEngine is now a community tutorial: I originally designed this workshop module last year (thanks to @ecoangelhsu ), and have since updated it for #Yale #GISDay 2018 and (upcoming) 2019 ().

Beginner's Cookbook | Google Earth Engine | Google for Developers

developers.google.com

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

9 months

Surface temperature inferred from satellites is view dependent, which can bias remotely sensed estimates of #urban #climate . 🚨In our recent paper () in #ScienceBulletin , we map this 'urban thermal anisotropy' for >5500 cities & quantify these biases. 1/n

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

4 years

After several updates and improvements, our global database of urban heat islands (link to original paper: ) is now in the #EarthEngine data catalog (). The data can also be explored here:

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Warhammer II - Legendary 20 Turns Guide - Cylostra Direfin

Total War: Warhammer II Legendary Difficulty Guide for the first 20 turns playing as Cylostra Direfin. Following this guide anyone should be able to handle ...

www.youtube.com

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

2 years

The "types of scientific paper" meme from @xkcd is now mostly dead. So I made one for #urban #climate research. Here's to eventually publishing papers covering all these categories.

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

1 year

An article about our study last year on estimating available space for equitable #urban #afforestation in #California using #Google #EarthEngine , #US #census estimates, and medium to fine-resolution #satellite observations. @Conserve_CA @googleearth

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Improving urban tree cover with Google Earth Engine | Google Cloud Blog

Researchers used Google Earth Engine to identify new targets for urban afforestation — planting new trees — in over 200 urban clusters in California

cloud.google.com

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

1 year

If you use artificial intelligence ( #AI ) and Earth observation ( #EO ) to study #urban #climate , consider submitting your manuscript to our special issue in the International Journal of Applied Earth Observation and Geoinformation. More info:

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

4 months

I am pleased to announce that I was invited to be a guest editor for multiple Frontiers & MDPI journals this year. I promptly ignored these requests. These journals add editors & special issues like they are catching Pokémon & I currently have the privilege to not participate.

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TC (Tirthankar Chakraborty)

@TC_Chakraborty

8 months

My #PhD supervisor sent me a copy of the latest edition of his book on Boundary-Layer Meteorology. This edition has a new chapter on the polluted boundary layer, a small part of which has some findings from my dissertation (which was not on urban climate🤷‍♂️). @YaleEnvironment

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

9 months

Another future #urban projection dataset just dropped (), this one considering fraction of urbanization at 1 km for more scenarios ( #SSP - #RCP combos). Will process it & add it to the heap that I was supposed to write a paper on from almost a year ago.

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

3 years

"Google Earth Engine open-source code for Land Surface Temperature estimation from the Landsat series" by @ermida_sofia #EarthEngine #Landsat Streaming now:

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

3 years

After spending way too much time visually inspecting the @Esri and @ESA_EO / @VITO_RS_ ~10m #landcover products, I compared the two more systematically for #urban (built-up) class on #EarthEngine . Results for a small selection of countries; one product with >double urban fraction:

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

3 years

In our recently published paper in Remote Sensing of Environment (), we test the sensitivities of #global and regional (by climate zone) #Landsat -derived surface #urban heat island (SUHI) intensities to different (5) methods of prescribing land emissivity.

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

5 months

In our new paper in @AguGeohealth , we examine the impact of #urbanization & Lake Michigan on different measures of 'heat' across community areas in #Chicago during summer using ensembles of coupled #weather #model simulations. [1/n] #GreatLakes #urban #heat #climate #heatstress

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

8 months

Just came across a recent paper on detection of surface #thermal discharge from global #nuclear power plants using #Landsat data: That's a really cool use of #satellite -derived surface #temperature . Image below shows occurrence of these thermal plumes.

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

11 months

UPS sent me an email 2 days ago about an incoming shipment. I was pulling my hair out trying to figure out what it was since I didn't order anything. Turns out it was my plaque for being a #Google Developer Expert for #EarthEngine . A huge👍to the #GDE program! #officialGDE

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

1 year

Presented on "Sharing and Visualizing your Scientific Data using Earth Engine" at the #Google booth. I think the recordings for many of these talks will be released soon. #AGU22 #EarthEngine @googleearth @EarthOutreach

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

4 years

Last year, we designed a web application () using #GoogleEarthEngine to characterize global urban heat islands, increasing traction of the accompanying paper () More information and a list of updates here:

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

11 months

🚨 In our new paper in @OneEarth_CP , we find strong associations between residential #segregation (both present-day and past [ #redlining ]) and disparities in outdoor moist #heatstress across US #cities using #urban -resolving model simulations: [1/n]

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

1 year

In our new #openaccess paper in @STOTEN_journal , we examine the impacts of #cool #roofs , #green roofs, and rooftop #solar #panels on near-surface #temperature , #heatstress , and cooling #energy demand in #Chicago during a #heatwave event of August, 2021.

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

1 year

Papers on #urban #heat keep stating that #Landsat 's #thermal data are at 30 m res. Native res of thermal band, depending on generation, is between 60 m & 120 m. Then it is resampled to 30 m. Given discontinuities at that scale over cities, there is little real signal at 30 m.

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

2 years

@timgill924 Academics underestimate the value of having kids who will exclusively cite them to further inflate their h-index.

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

3 years

As others have noted, new @ESRI product does not seem to be capturing much at that 10 m res, especially evident around urban areas. Example over New Haven, CT vs #NLCD 2016. I thought it would pick up New Haven Green at 10 m res; which shows up as developed open space in NLCD.

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@giswqs

Qiusheng Wu

3 years

Breaking: @Esri launches 2020 global 10m land cover map powered by Impact Observatory deep learning algorithms and Copernicus European Space Agency - ESA Space Agency Sentinel-2 imagery, leveraging the Microsoft #AI for Earth #PlanetaryComputer . #eochat

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TC (Tirthankar Chakraborty)

@TC_Chakraborty

1 year

@mariopansera Pretty bad take. 1. x papers published this year could be the result of several years of work since peer review timelines vary. 2. Whether 'it' is humanly possible or not depends on what 'it' is. Fields and even research groups have different criteria for authorship.

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TC (Tirthankar Chakraborty)

@TC_Chakraborty

3 months

It would be absolutely great if the #GIS portals of #city governments made the shapefiles of their cities available for download instead of sharing maps in only image and pdf formats.

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TC (Tirthankar Chakraborty)

@TC_Chakraborty

1 year

A little late to this, but here is an animation of the development of the recent winter storm over continental #USA using daily minimum air #temperature from #GRIDMET . #EarthEngine #geemap #EOChat #dataviz #geospatial #GeoPython

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TC (Tirthankar Chakraborty)

@TC_Chakraborty

1 year

My colleagues and I are guest editing a focus issue for @IOPenvironment on 'Human-Earth System Interactions under Climate Change'. If you are working on something relevant to this broad topic, we encourage you to submit your work. More details here:

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TC (Tirthankar Chakraborty)

@TC_Chakraborty

1 year

Are you telling me my #EarthEngine app could have been a paper? /s Link:

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@physorg_com

Phys.org

1 year

World-first study into global daily #airpollution shows almost nowhere on Earth is safe @TheLancet

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

2 years

Our old paper on a #global surface #urban #heatisland database is apparently the most cited article published in this journal since 2019 (arbitrary threshold?). I have several thoughts about this work now (more in the future), but am glad that it has garnered interest. #EOchat

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TC (Tirthankar Chakraborty)

@TC_Chakraborty

3 months

With @EPA reducing annual PM2.5 limit to 9 ug/m3, I wanted to share this app () that visualizes PM2.5 globally. Note that this uses the recently revised @WHO #airquality standard of 5 ug/m3. 99.58% of us live in areas with PM2.5 above the WHO threshold.

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TC (Tirthankar Chakraborty)

@TC_Chakraborty

2 years

Playing around with @googleearth Dynamic World dataset to understand its use for delineating #urban areas. Random highly urban pixel over Tokyo (mosaiced probability close to 0.75 since 2016). Interesting anomalies in the time series though. #EarthEngine #geospatial #eochat

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TC (Tirthankar Chakraborty)

@TC_Chakraborty

1 year

#Urban areas modify local #weather and #climate and urban clusters have increased over time. #Visualization below (using #D3 ) shows 15 countries with most urban clusters from 1992 to 2020 based on #ESA CCI land cover data. #EarthEngine and #ArcPy were used for vectorization.

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

7 months

I know the author. @EEFAbook #urban #heat #remotesensing #EarthEngine Link to #openaccess chapter and book:

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

4 years

Here is the #EarthEngine app for visualizing disparities in surface urban heat islands in US urbanized areas: Link to original paper:

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

3 years

At our next #EarthEngineVirtualMeetup on Nov 25 at 1 PM (EST), @csaybar will present his work on: "rgee: An R package for interacting with Google Earth Engine" #GEE #EarthEngine #RStudio #geospatial Register here:

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

1 year

Three decades (1985 to 2015) of human settlement evolution over #Shanghai and other major #urban clusters in the Yangtze River Delta at ~30 m resolution. Lighter shades show earlier settlements. #EarthEngine #ESA #EOChat

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

1 year

Been in Tri Cities, Washington for over a year and haven't examined any satellite data over the region. So here is normalized difference vegetation index (NDVI) for summer 2020 from #Landsat 8. Those circular fields are apparently the result of center-pivot #irrigation . #pnw

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

8 months

Here is an #EarthEngine #webapp I developed to explore #global distribution of particulate matter #airpollution : Annual values are around 20 times the revised @WHO standard in many parts of the Indo-Gangetic Basin, where over half a billion people live.

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@pujaawasthi

Puja Awasthi

8 months

India’s entire population lives in areas where the air pollution exceeds @WHO standards. Almost seven in 10 Indians live where air pollution exceeds the country’s own average acceptable level. #airpollution @UChiAir #lifeexpectancy

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

1 year

In our recent study in @ElsevierConnect 's #Urban #Climate with @JulieWa46843981 , @ZhaoY_Hydromet & others, we separate the impacts of urbanization and lake breeze on moist #heatstress over #Chicago metropolitan area using #WRF model simulations. [1/n]

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

2 years

Link to the manuscript (reach out to me if you do not have access): I also developed an #EarhEngine web application to visualize the dataset (which I am currently updating):

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

2 years

Officially a @GoogleDevExpert for #EarthEngine ! Happy to join this first cohort with many amazing people ( @BzGEO , @morganahcrowley , @samapriyaroy , @Keiko_geo , @ZanderVenter6 , @giswqs , @dmlmont , and more) who are using #EarthEngine to positively impact the world.🛰️ #EOchat

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

6 months

Back at my PhD alma mater @YaleEnvironment @Yale after almost two years. Looking forward to giving a talk tomorrow on #urban #heat at @YaleEarthObs .

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

2 years

Most of the session recordings from the #GeoforGood22 summit are now available on the website:

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2022 Geo for Good Summit

Our Geo for Good Summit (Oct 4-6, 2022) is an annual conference geared toward nonprofits, scientists, government agencies and other change-makers who want to leverage mapping tools and technology for...

earthoutreachonair.withgoogle.com

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

2 years

Excited to attend #GeoforGood22 next week and talk about some ongoing work on #urban #heatstress disparities in the #US that combine #satellite observations and numerical #weather simulations. #EarthEngine #EOChat

@googleearth

Google Earth

2 years

During Climate & Environment Lightning Talks you’ll hear about 10 different projects using mapping tools to address issues around climate and the environment @caitlinmothes @TC_Chakraborty @PNNLab @argie_kavvada @EO4SDG @NASAEarth @Ch_Gohr :

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

4 months

I am bringing this back as things have gotten significantly worse (and I still haven't published in all these categories). Also, QT with a meme you made.

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@LongFormMath

Jay Cummings

4 months

QT with a meme you made

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

8 months

You have seen me rant about #satellite -derived land surface #temperature on Twitter in the past. If you are at #ICUC11Sydney , you can watch me do that IRL tomorrow morning in Mathews Room 231. Seeing that title, I may have crammed too many subtopics into this talk.🤔

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

2 years

First in-person talk in years. Now I can relax and enjoy the rest of #GeoForGood22 .

@SabrinaSzeto

Sabrina Szeto

2 years

Next up, @TC_Chakraborty takes the stage sharing how land surface temperature from satellites relates to ambient heat stress and air temperature within cities, based on crowdsourced ground-based data.

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

4 years

Our newly developed urban heat island database for the US suggests large disparities across income and racial groups: The data can be visualized on this #GoogleEarthEngine app:

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

7 months

And so it begins. #GeoForGood23

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

1 year

Editor's highlights for our recent paper @theAGU ( @AguAdvances ) examining the decoupling between #satellite -derived surface #temperature and moist #heatstress within and across #urban areas in Europe during a #heatwave using citizen #weather stations.

The Lower Humidity of Urban Areas Moderates Outdoor Heat Stress - Eos

Data scarcity of traditional observations cannot reveal whether surface temperature capture the potential for urban heat stress. This study improves the dataset with 40,000 citizen weather stations.

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

6 months

Convening session (with @mathieuGravey , @EVerdiguier , Alvaro Moreno, & Liza Goldberg) on 'Enhancing Geospatial Analysis with Google Earth Engine: Innovations, Applications, and Extensions' at #EGU24 . More here: #EarthEngine #gischat #remotesensing

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

2 years

In our paper published in Advances in Atmospheric Sciences (), we review how #urbanization can impact regional climate and extreme weather, starting with urban #heat islands (canopy, surface, boundary-layer, etc.) and heat waves, to... [1/3]

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Urbanization Impact on Regional Climate and Extreme Weather: Current Understanding, Uncertainties,...

Advances in Atmospheric Sciences - Urban environments lie at the confluence of social, cultural, and economic activities and have unique biophysical characteristics due to continued infrastructure...

link.springer.com

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

1 year

@WMO Most of these points are already covered in the original #paper (either in the main text or in the supplementary text). Would be nice if people actually read the papers that they were using to support their own biases. [18/n]

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

2 years

This is really cool.

@GoogleAI

Google AI

2 years

Introducing the Auto Arborist Dataset, a multiview urban tree classification dataset that consists of ~2.6M trees and >320 genera, which can aid in the development of models for urban forest monitoring. Check it out at →

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

8 months

I will be talking about 'Examining Urban Heat Across Scales: From Observations to Model Simulations' this Monday (Sep 18th) for the @michigantech Environmental Engineering Graduate Seminar. Event and streaming link: #urban #heat #climate #heatstress

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

8 months

I have a couple of talks on #UrbanClimate at #ICUC11 next week. Also my first time attending this conference (I barely had a research career during ICUC10). Since I have a ~24 hr flight to Sydney, I am hoping that is enough time to start & finish working on my slides.🤔

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

5 years

The community tutorial I was working on to customize the base map styles in Google Earth Engine has now been published: #EarthEngine

Customizing Base Map Styles | Google Earth Engine | Google for Developers

developers.google.com

@jstnbraaten

Justin Braaten

5 years

Customized your #EarthEngine basemap. Learn how in this new #community contributed tutorial (congrats TC).🗺️📜 👉 Have an idea for an EE tutorial? Here's how to submit it: 👉

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

10 months

Brightness temperature (BT) is NOT land surface temperature (LST). BT is the temperature of a hypothetical black body with the same emitted radiation as a surface. This has to be corrected using the emissivity of that surface to get LST, which is higher than BT for real cases.

@RyanMaue

Ryan Maue

10 months

🚫Disinformation!🚫 Land surface temperatures or "Brightness Temperatures" from satellites are NOT the same as air temperature that a thermometer would read.

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

10 months

On our recently published study on moist #heatstress disparities across #US cities. Here we examine associations between residential #segregation (both present-day and past [ #redlining ]) on different measures of #urban #heat exposure. Link to paper:

@PNNLab

Pacific Northwest National Laboratory

11 months

Pretty much everywhere, it’s gonna be hot—and in U.S. cities, some people endure more heat than others. New PNNL research finds that the average Black urban resident is exposed to disproportionally higher heat stress:

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

3 months

Great panel! Mentioned this new paper on the intersection between human #mobility & #urban #heat : We often assume that people are exposed to the environment of their home census tract/block/etc., which is not always true. Hope to see more data on this.

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

3 months

I will be talking about 'Isolating local urban climate signals and their relevance for public health' at the 'Climate Vulnerability Mapping - Available Tools and Research Gaps' session tomorrow, part of the CAFÉ Climate and Health Conference 2024. #climatehealthcafe

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

2 years

There has been unprecedented #urban growth in recent decades. Examples here are from a ~30-m resolution #satellite ( #Landsat )-derived impervious area dataset from 1985 to 2018. #Shanghai just "blue" up the whole panel (yes, that was bad). #EarthEngine #EOchat #RemoteSensing

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

4 years

Change in built-up pixels in and around Shanghai, China from 1992 to 2018. Data Source: #ESA CCI land cover data Platform: #GoogleEarthEngine PS: Took way too much work to get a base map to show with the timelapse.

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

1 year

I am entering the #30DayMapChallenge on day 7 with a repost. Time-lapse of ~30m resolution #satellite ( #Landsat )-derived impervious surface rasters from 1985 to 2018. #EarthEngine #EOchat #RemoteSensing #urban

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

1 year

#30DayMapChallenge Day 11: Red Made an interactive web #map (app?) to visualize built-up/built area pixels (in red) in @Esri #landcover , @ESA #WorldCover , & @Google @WorldResources #DynamicWorld . Link to app: #EarthEngine #EOchat #GISChat #RemoteSensing

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

11 months

#AGU23 abstract submission season has begun and I wanted to add another deadline (specifically, 2nd August) to your calendar. I am co-convening 3 sessions this year, including 2 newly proposed sessions. Looking forward to seeing the great #science everyone is doing. Details⬇️

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

9 months

In our recent paper in #AGU #GRL () , we show large differences in long-term trends in surface (from land surface #temperature or LST) & canopy (from air temperature or AT) #urban #heat islands (UHIs) & their drivers across #global #cities (n=5643). 1/n

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

9 months

Since I started convening AGU sessions, it has been fun to monitor how 80% of the submissions happen on the day of & the day before the deadline. Reminds me of a quotation from Douglas Adams: “I love deadlines. I love the whooshing noise they make as they go by.” #AGU23

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

1 year

#30DayMapChallenge Day 12: #Scale Gridded air #temperature over Connecticut, US from datasets with differing grid sizes. NCEP/NCAR: ~209 km @CopernicusECMWF ERA5: ~30 km #Daymet : ~1 km Grid sizes of CMIP6 #climate models fall between the first two (closer to NCEP/NCAR).

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

1 year

MDPI definitely shows predatory tendencies (and so do many other for-profit publishers). But Predatory Reports, the site posting this list, has 80 followers on Twitter and their about us page provides as much clarity as some of MDPI's editorial decisions. Something to consider.

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@g_sbardella

Gianluca Sbardella

1 year

MDPI journals have been included in the list of predatory journals. It was about time.

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TC (Tirthankar Chakraborty)

@TC_Chakraborty

1 year

It finally happened. I was invited to review a paper (for a top journal in the field, no less) that I am a co-author on. #AcademicTwitter #AcademicChatter #Scientificpublishing

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@TC_Chakraborty

TC (Tirthankar Chakraborty)

@TC_Chakraborty

6 months

I will give a seminar next week at Boston University on #urban #heat across scales. Thank you, @lrhutyra , for hosting me & @buclimatehealth , @buoncities , @bubiogeo , & @BU_Computing for co-sponsoring the visit. Will be nice to head back to the Northeast after almost 2 years.

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