Duncan A Smith
@citygeographics
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Urban visualisation and GIS lecturer- maps and all that jazz. Works at CASA UCL. Blogs at
Joined November 2011
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I've updated the World Population Density map with the new GHSL 2023. It's a big improvement, with higher resolution and more accurate mapping of density and settlement patterns across the globe-
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I've been mapping the new 2021 census occupational class data to track gentrification in London and Manchester. There's some really interesting results, some expected, some surprising-
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New open access paper out on gentrification and accessibility in London- "A compact city for the wealthy? Employment accessibility inequalities between occupational classes in the London metropolitan region 2011"
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New interactive map: World Population Density using the brilliant Global Human Settlement Data-
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How to accurately measure public transport accessibility for GB cities using the PTAI-2022 dataset-
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Can we develop London's Green Belt sustainably to ease the housing crisis? Some new research into new build volume and sustainability using the EPC data-
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📢New book📢I've got a history-photography-mapping book coming out next month called 'Gilded City: Tour Medieval & Renaissance London'. Find out more here-
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Opensource public transprt accessibility modelling- my talk from this week's
#RGSIBG16
conf-
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How much is the 2021 Census affected by pandemic changes to place of residence? From the early data, it looks like quite a lot-
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New blog post on London's Plans for a cycling revolution as we come out of lockdown. Where should new cycle lanes be prioritised?-
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I voted
#Remain
for a brighter, more tolerant and more prosperous future for the UK
#Ivoted
#StrongerIn
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@rcolvile
@JeremyCliffe
Fact that cannot be stated enough: Conservatives to blame for Brexit ref, and the ongoing chaos that has followed. No Tories, no Brexit.
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New paper from
@CASAUCL
in EPB- Nicolas Palominos' method for measuring pedestrian and vehicle space for all streets in Greater London, highlighting infrastructure for active travel
🙏 to reviewers: "[paper]... tackles a difficult area of research, i.e. the transition between infrastructure-level and network-level assessment of streetspace allocation"
The new method computes cross-sections to investigate walking impedance around train stations in London
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@sarahwollaston
Sadly the Tory govt destroying our public services, wrecking the economy and endangering our security with a hard Brexit. Utter hypocrisy!
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@iainmartin1
UK has expertise and resources to lead in tackling climate change. Instead current gov had no significant role in Paris agreement, taken to court over air pollution, damaged solar industry, is failing to deliver sustainable transport... We're wasting years we don't have
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@willnorman
@alan_s01
@BarnetCouncil
I cycle in Barnet, and it's really behind other boroughs in terms of cycle routes. Need a safe route from Colindale to Brent Cross and then into central. Should be part of the current Brent Cross regeneration
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@mattfrei
@BorisJohnson
Sounds like a good bet, but in that case caretaker PM should go for 2nd referendum rather than election
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@montie
Those are the lies 52% bought. In reality we are a poorer, more divided, more unstable nation that's losing control & it's only just started
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@thomasforth
I've got a different perspective on this using GHSL data. Agree Manchester has a higher population and weaker infra. than peer cities in Netherlands/Germany. But not convinced core is higher density. Here are density profiles of population in urban areas-
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Impressive work by
@puddingviz
mapping the entire Global Human Settlement Layer in 3D- that's a lot of polygons in the browser! -
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More info and analysis about the World Population Density map can be found here-
The GHSL data is produced by the EC JRC, and can be downloaded here-
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@CASAUCL
@npalomin
@BartlettUCL
@uclnews
I've also written a blogpost on the Streetspace for London proposals from the Mayor, compared to the network analysis from the working paper-
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Nice mapping tool showing extent of inequality across the EU post-crisis-
http://t.co/lA9FBxiBLW
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All the accessibility indicators show that London has massively higher public transport accessibility, which shows what decades of infrastructure investment, planning and densification can achieve. We need to support other UK city-regions in following a similar model
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For people into web mapping for research, I've a new review paper published-
#openaccess
#opendata
#dataviz
@CASAUCL
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@HackneyAbbott
@LabourList
He is unelectable outside of London, and will be hammered by UKIP. Please wake up!
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Really impressed by the massive
#PeoplesVoteMarch
today! Great atmosphere with people of all ages from all over the UK
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@iainmartin1
So you support May's speech today? It was highly irresponsible and damaging for the UK. She's even worse than Cameron
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@rafaelbehr
It's a brilliant film. Great performances, visually stunning, sharply written, wonderful score, and a suitably tragic finale. Oppenheimer deserves its critical acclaim and I expect it will bag quite a few Oscars
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There's a nice mention of my book in the New Criterion this month-
Our critic’s pick: “Gilded City: Tour Medieval and Renaissance London,” by Duncan A. Smith (Unicorn).
@UnicornPubGroup
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Graduate mobility & closing the productivity gap in UK cities- -New
@foresightgovuk
research
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@iainmartin1
London population at record levels, prioritising public transport, walking and cycling only way to keep city moving. You can walk across bridge in a couple of mins, maybe give it a try?
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@TIME
Lots of great classics on this list, but seems too narrow a view of fantasy for me. Calivino? Borgues? Atwood? Murakami?
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A map of
@SadiqKhan
&
@cityoflondon
's radical plans for Car Free streets was shown on
@BBCLondonNews
yesterday. It's just sinking in how transformational a proposal this is...
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The second is the peak accessibility by destination, which measures the total labour market size and the agglomeration potential. This favours larger city regions with big rail and metro networks-
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Some researchers argued gentrification slowing in London, but we found proportion of most affluent professional classes in inner city continues to grow (looked at change 2006-2016)
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Huge majorities for Lib Dems in South West London (Richmond 52%, Wandsworth 37%), joined with success in West London (Ham&Ful 34%, Ken&Chel 36%), and overtaking traditional Labour Inner London (Camden 36%, Islington 30%, Southwark 33%, Lewisham 28%)
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The
@CASAUCL
seminar tomorrow features
@robinlovelace
discussing open source transport planning. All welcome!
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@thomasforth
Here's a more reliable measure of jobs accessibility for GB cities using the excellent work by
@raffverduzco
&
@DrDPMcArthur
. Measures the average number of jobs reachable by residents in 30 & 60 mins. Interestingly the 30m accessibility gap also with Edinburgh and Glasgow-
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@UrbanDemog
@raffverduzco
@DrDPMcArthur
@danc00ks0n
@thomasforth
@CASAUCL
Given the big regional inequalities between UK cities, it is important to understand public transport accessibility. The
@FT
recently published
@CentreforCities
accessibility analysis on UK cities. But their measure makes no sense, e.g. Manchester half access of Newcastle-
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This argument makes no sense. Currently we only deliver affordable housing at scale when we build market housing. Graph below shows additional affordable housing and market housing 2011-21 in South East -
@SimonClarkeMP
@CentreforCities
The only way to solve the real housing crisis, this one, is social housing. Build, build, build market housing is a hopeless refrain:
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The World Population Density site includes population and density timeseries stats for countries and cities. The largest city region in the world using this dataset is the 'Greater Bay Area' (Guangzhou-Shenzhen-Dongguan) in China with a population of 43.8m
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@adam_dennett
Hi Ad, yes good question. National average is a +5 percentage point change in Professional Classes. So the red areas in the change map are well above. But transformation to knowledge economy is national, and the overall change in London not unique
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This results in advantages in average accessibility for the most affluent classes, particularly by slower more sustainable modes (bus and walking). This is a real challenge as less affluent groups priced out to less accessible Outer London locations-
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First
@CASAUCL
seminar of the new term will be Dan Lewis, speaking about urban health and spatial analysis. Talk is free to public- 5pm Wednesday 10th January LG04 Bedford Way
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Some new
@CASAUCL
research- Understanding Britain's fracturing political geography-
http://t.co/MAnfLHcLg2
…
#GE2015
http://t.co/TLFaRiSGbN
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Sadiq Khan going all in on an active travel car-free transformation for Central London. Huge challenges, fascinating times-
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Join us for our
@CASAUCL
Open Day event Tuesday next week discussing the Smart Cities & Urban Analytics and Spatial Data Science & Visualisation MSc programmes. Find out more here-
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My Tory MP Matthew Offord
@Offord4Hendon
voted yesterday for the economic disaster of No Deal, when 58% of Hendon voted for remaining in the EU. Completely reckless and against constituents' views
@HendonLabour
@BarnetLabour
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@montie
Yes but seven years too late. Should have begun in 2010 as best response to global recession, as left argued. Instead we got austerity
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@iainmartin1
UK exposed to energy shortages due to poor energy efficiency, badly insulated homes, selling off gas storage and slow switch to renewables. If we had followed green policies rather than Cameron's 'cutting the green crap' we'd be in a much better position
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Social distancing means many restaurants and pubs won't break even. Solution from Soho Estates: remove cars, trade on the streets. Campaign here- Could this work in
@EnjoyFitzrovia
@ChinatownLondon
Shoreditch etc. also?
Soho Estates’ campaign is growing for timed road closures in
#Soho
to let restaurants trade outside.
“It’s not that difficult...just shut the damn roads. Deliver in the morning, do the waste in the evening, shut the roads in between."
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Clever Guardian network viz showing Brexit breaking two main parties and leaving dangerous stalemate-
How Brexit changed Britain from a two-party system to four-faction dysfunction
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'Hype and decline of the world's first smart city'- chapter by Seungho Yoo and
@jmichaelbatty
in Caprotti and Yu's new Sustainable Cities in Asia book-
@CASAUCL
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@iainmartin1
May will obviously win the election; offending EU pointless and going to hinder negotiations. Turning key allies like Merkel against us
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East Asian megacities like Hong Kong and Singapore have amongst highest densities in the world and high levels of travel with mainland China; yet few deaths through lockdowns, testing and preparedness
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My new photography-history-mapping book Gilded City: Tour Medieval & Renaissance London is now out in Waterstones and other good bookshops. Find out more here-
#newbooks
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@MHHistSoc
Yes that's right, the mapping is picking up developments in Hendon, Colindale, Mill Hill. Seems to be substantial social changes across Barnet
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Has travel behaviour now settled into a new normal? I look at evidence from DfT data and National Travel Survey-
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Recent articles understandably discussing whether urban densities will need to be reduced in response to coronavirus. I think this is premature
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The Global Human Settlement Layer 2023 data has improved detail, with a 10 metre built-up area layer used to create a 100 metre population surface. This results in better mapping of both cities and complex peri-urban landscapes found in the Global South
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@FraserNelson
Xenophobia always been the beating heart of Brexit- Spectator promoted it and is complicit in the consequences. Delusional to think hostile-environment Home Office is going to change now
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Really enjoyed sumptuous
#WarAndPeace
adaptation, especially wonderful Paul Dano!
#takeabowBBC
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I really wish London could dramatically reduce prices through local policies, but regional market integration means this is unlikely. This analysis uses Price Paid, which is affected by collapse in sales during pandemic and proportion of flats sold
The result?
Dozens of bungalows and other detached homes were rebuilt and enlarged into attractive three-storey apartment buildings, each housing half a dozen households in spacious modern flats.
Supply rose, and prices came down. In London!
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We have an open day this Friday to find out more about the new MSc Urban Spatial Science at CASA UCL-
CASA - Open Day - MSc/MRes Urban Spatial Science 11.00am - 18 March - Register here -
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@JamesMelville
71% of Labour GE2017 voters support remain (yougov). Hard Brexit = more austerity. Manifesto sitting-on-fence going to alienate core vote
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Even largest mainland China cities outside of Hubei have avoided large outbreaks so far. I'm expecting lessons from Covid-19 to be much more about city preparedness, swiftly implementing lockdowns, testing and health care quality. Clearly increasing authoritarianism is a risk
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Note where very high densities combine with high levels of poverty is surely where risks are greatest. That's why the situation in India is so precarious
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The Tulip tower belongs in a sci-fi theme park, undermines what makes
@cityoflondon
unique. New Museum of London and Concert Hall plans the right way to attract tourists, not tacky pointless eyesore, please block
@MayorofLondon
@JBrokenshire
Fosters' Tulip gets OK from City planners - but likely to face public inquiry
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@UrbanDemog
@raffverduzco
@DrDPMcArthur
@danc00ks0n
@thomasforth
@CASAUCL
@FT
@CentreforCities
I've used this dataset to create two accessibility measures. The first is the average access to jobs for city residents, which measures the extent and comprehensiveness of transit across cities. This tends to favour compact high density UK cities-
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@undertheraedar
I had expected to see a London bias, but that is incredibly high! Would be great to get the same figure for other large GB cities- does anywhere else reach 10%?
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So if we look at the 12 largest urban agglom. in 2035 (analysis tab, bottom-left), there are predicted to be 3 East Asian, 4 South Asian, 3 African & 2 Latin American cities; 0 from Europe & USA
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@en_topia
@BartlettUCL
@CASAUCL
@gabrifilo
@jtoump
And here's some more photos of Flora and Ioannis. Thanks for presenting everyone!
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@ChrisGiles_
No, Glasgow and Edinburgh perform better than expected despite relatively small populations, and Birmingham and Manchester under perform despite larger populations. Accessibility measures at longer travel times do scale with population, but that makes sense
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@thomasforth
The criticism was you were claiming to measure population density without controlling for urban land. Population density is defined as population divided by land area, that's what it is, and why you get weird results like inner Manchester being higher density than Copenhagen
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@montie
Economic costs long term. Undermining trade and investment in leading UK industries- finance, research & HE, automotive, IT, pharma...
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@thomasforth
Manchester's core is more fragmented and lower density than compact cities Amsterdam/Copenhagen (Berlin closer to Manchester). This makes sense theoretically- better public transport should intensify core. The stats from my website mapping GHSL 2020-
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LDN NYC HK 3D density maps- World city densities: poles apart?
http://t.co/8DTGZfyq
#UAElectric
@LSECities
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Explore the performance and dynamics of GB cities at
http://t.co/9dujYx2xeH
-
http://t.co/u5tzhGX325
@CASAUCL
http://t.co/4CFYFTt0dd
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Support from boroughs will be vital. City of London already indicated support, boroughs such as Hackney very pro-cycling. Unsure about Westminster, control many key routes
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@crisortunity
Great video! Is it maybe a female sparrowhawk? I think they go for pigeons too, and it looks quite tawny in colour
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Can fair & democratic general election campaign be conducted under a Critical level terrorism threat? Should consider postponing
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These proposals are still in development, and do not yet look like a complete network. Network analysis by
@npalomin
highlights the most important streets linking typical underground journeys (and so where we expect cycling demand to be highest post-lockdown)
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@thomasforth
Poor rail/metro huge drag on economies of northern cities. But (residential) densities are low in the core of Manchester/Leeds given size - lower than Brighton, Bristol or Edinburgh. So it's a double economic hit- poor regional accessibility, plus insufficient density in core
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@CityMetric
Yes good point. It's link between strong city centres, knowledge economy agglom. and PT/active travel. All university cities
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@paulmasonnews
He had terrible campaign, can't lead and will be hammered by Boris & UKIP. Change now or face even more rightwing gov
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@dr_xeo
@CopernicusEU
@AGE_Oficial
Hopefully a future Copernicus release... I really like the cumulative plot to show the distribution. Seems like about 60% of London buildings 7-8 metres high (2-3 storey terraces I think), makes it such an outlier
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Great CitiesOutlook2015 from
@CentreforCities
. N-S divide widening; mixed signs on jobs
http://t.co/Kyc0T3jRNd
http://t.co/emzWgi8q4z
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In the ONS House Price Index data (which is normalised by housing type), the borough of Croydon has higher price increases than Outer London during this period-
Nevertheless, still interesting densification policy and could work if pursued by all boroughs
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@DuneScholar
Definitely a key change the book. I thought it worked well, with Chani's arc dramatising the tragedy of Paul's messianic ambitions. She comes across as a strong defender of Fremen culture, with faith and agency, but loses some depth. Interesting how this will affect next film
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