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Vasileios Milias

(Βασίλης Μηλιάς)

Hey! I am Vasilis. I work as a postdoctoral researcher at the Laboratory of Transportation Engineering of NTUA and as a senior researcher at Transform Transport .

My research spans the fields of urban mobility and urban analytics. Within these domains, I focus on developing computational methods, tools, and indicators for evaluating the degree to which urban areas are (co)accessible, walkable, inclusive, sustainable, safe, and attractive for all. Through my work, I aim to support the UN's SDG 11: "Make cities and human settlements inclusive, safe, resilient and sustainable".

In 2024, I obtained my PhD in Urban Analytics at TU Delft , as a member of the Urban Analytics Lab. In my PhD, I introduced and studied the concept of urban co-accessibility: a destination’s potential to bring together different individuals and individuals from diverse demographic groups. Throughout this work, I engaged in an in-depth investigation of urban accessibility, spatial data science, and machine learning .
NEW accessX, our open-source Python library for accessibility analysis developed with TT, is out. Check it out →

News

[Sep. 2026]
CThood Elevated, a new map for exploring how terrain and walking preferences reshape 15-minute pedestrian accessibility in Athens, is now live. The redesigned CThood and CTwalk Map are also available.
[Sep. 2026]
Presented Tracce, one of our latest projects at Transform Transport, at the CIVITAS 2026 conference in Thessaloniki. Developed through a participatory process with citizens, local associations, Comune di Monza, and Monza Mobilità, the project maps barriers to independent mobility and supports accessible route planning and the reporting of urban accessibility issues.
[Sep. 2026]
Published a new paper in Transportation Research Part D: Transport and Environment, entitled "Contextualising the impact of street slopes on pedestrian accessibility for sustainable mobility". Read it HERE.
[Jul. 2026]
accessX, our open-source Python library for accessibility analysis developed with Transform Transport, is now out.
[Jul. 2026]
Part of the newly funded Horizon Europe and New European Bauhaus ROUTES (Reimagining Open Schoolyards and Urban Streets as Equitable Spaces) project.
[May. 2026]
Guest lecture at NTUA's School of Architecture as part of Dimitris Papanikolaou's course "Network Ecologies: Humans, Algorithms, and Urban Synergies in a Finite World"
[Mar. 2026]
Published new research in collaboration with TT on how street-level imagery can support the design of heat-resilient cities. Check it HERE
[Jan. 2026]
My poster on "Guiding Framework for the Design of Walkability Analysis Software Tools: Insights from Urban Planning Practitioners" was featured in the 105th annual meeting of the TRB, 2026 ". Check it HERE
[Nov. 2025]
Published a journal article in Environment and Planning B, entitled "Assessing equitable access in X-minute cities through open spatial data". Read HERE
[Nov. 2025]
Gave an invited talk entitled "From accessibility to co-accessibility" during the art exhibition Constant bliss in the city at Circuits and Currents project space of the Athens School of Fine Arts(Greece)
[Oct. 2025]
Presented my work at the ICTR2025 conference in Thessaloniki (Greece).
[Jul. 2025]
Published a policy paper "A practitioner-guided framework for urban analysis software" in collaboration with AMS institute. Read HERE
[Jul. 2025]
Discussed in SKAI Radio with Katerina Drakou about CThood and how to study to what degree Athens is a 15-minute city. Listen HERE (starting at 25').
[Jul. 2025]
Interviewed by ΝEWS247 about CThood and to what degree Athens is a 15-minute city. Read HERE.
[Jul. 2025]
Interviewed by New Polis about the story of CThood. Read HERE.
[Jun. 2025]
Published two papers in the CUPUM2025 conference, in London, UK, on CTWalk and on Population-specific factors of pedestrian accessibility
[Jun. 2025]
Co-organized and presented in a workshop entitled "" Walking the X-min City: Methods and implementations to assess walkability and pedestrian accessibility at the Agile2025 conference in Dresden (Germany).
[Jun. 2025]
Participated in a panel discussion at the Aristotelis Climate Forum in Athens. Check it HERE.
[May 2025]
The family of CTwalk is growing. CThood is now available online!
[Feb. 2025]
New job! Just joined NTUA as a postdoctoral researcher. Find the lab HERE
[Feb. 2025]
New job! Just joined Tranform Transport's team. Find the research foundation HERE
[Oct. 2024]
New paper published at the Journal of Transport Geography. Read it HERE
[Oct. 2024]
New paper published at the Journal of Transport Geography. Read it HERE
[Oct. 2024]
Lead the workshop on “X-min cities, pedestrian accessibility, and digital tools“, during the Urbanism Next Europe Conference in Amsterdam (Netherlands)
[Sep. 2024]
Obtained my PhD! Read my open access PhD dissertation entitled "Urban Co-accessibility" HERE
[Jun. 2024]
Presented my work at the ΕΣΧΣΑ - 1st Scientific Conference on Spatial Planning and Development (Thessaloniki, Greece). Read it in the book of abstracts HERE
[Jun. 2024]
New paper pubblished at the Computational Urban Science. Read it HERE
[Jun. 2024]
🏆 Won the best full paper award at the Agile2024 conference. Read it HERE
[May. 2024]
Started working remotely as a Senior Researcher at AMS institute.
[Apr. 2024]
🏆 Won the first prize demo award for CTwalk MAp at the NWO ICT.OPEN conference.
[Jan. 2024]
Gave an invited talk at TNO on "CTwalk and CTstreets: Exploring Walkability and Pedestrian (Co)Accessibility through Interactive Maps".
[Νοv. 2023]
The family of CTwalk is growing. CTstreets is now available online!
[Oct. 2023]
CTwalk Map is exhibited at the Dutch Design Week 2023. Read HERE.
[Sept. 2023]
Featured in a short news article in Delft Design Stories. Read HERE.
[Sept. 2023]
Lead the workshop on “What Factors Impact Access to Public Spaces and for Whom?“, realized in the City Hall of Helsinki (Finland) with Equal-Life's researchers and stakeholders.
[Aug. 2023]
CTwalk Map featured in #73: La Cultura Del Dato newsletter by Stefano Gatti. Read HERE.
[July 2023]
CTwalk Map featured in Rafagas Links "#2103: cities, biodiversity, minefield". Read HERE.
[June 2023]
Published and presented a paper in the AGILE2023 conference, in Delft, Netherlands. Read HERE.
[June 2023]
Published and presented a paper in the CUPUM2023 conference, in Montreal, Canada. Read HERE.
[June 2023]
CTwalk Map featured in #521: quantum of sollazzo newsletter by puntofisso. Read HERE.
[June 2023]
CTwalk Map featured in the beSpacific blog. Read HERE.
[May 2023]
Lead the workshop on “What Factors Impact Access to Public Spaces and for Whom?“, with the support of the American Planning Association. Read HERE.
[May 2023]
Presented CTwalk Map and how to map walking accessibility of different population groups at the National Program for Sustainable Digital Information Management Demo Day. Read HERE
[April 2023]
Exhibited posters at ICT Open 2023 conference. Download the poster HERE.
[March 2023]
Gave an invited talk at TU Delft’s CityAI Lab on computational methods for assessing accessibility.
[June 2022]
Published a journal article in Computers, Environment and Urban Systems. Read HERE.
[March 2021]
Published a journal article in Computers, Environment and Urban Systems. Read HERE.

Short CV

Work Experience

Postdoctoral Researcher · 2025 – Present · NTUA, GR
Senior Researcher · 2025 – Present · Transform Transport, IT
Senior Researcher · 2024 – 2025 · AMS Institute, NL
PhD Researcher · 2020 – 2024 · Urban Analytics Lab, TU Delft, NL
Spatial Data Specialist · 2019 – 2020 · HERE Technologies, NL
R&D Intern · Sept – Feb 2018 · Philips Lighting, NL
Project Assistant · Apr – Jun 2015 · MIT, U.S.

Education

PhD in Urban Analytics · 2020 – 2024 · TU Delft, NL
MSc in Computer Science · 2016 – 2018 · TU Delft, NL
BSc & MSc in Electrical and Computer Engineering · 2010 – 2016 · NTUA, GR

My top picks

Python PostgreSQL QGIS JavaScript



Interest

My research focuses on the potential of people to move through cities and access essential services, and on how urban form, transport, terrain, climate, and social diversity shape that potential. I enjoy combining open data, geospatial analysis, and visualization methods to understand accessibility, walkability, and broader urban mobility patterns in ways that go beyond simple distance metrics.

I also explore ways to transform my research into replicable tools such as CThood, CTstreets, and CTwalk, that aim to help cities evaluate mobility and proximity-based planning more realistically at scale. More broadly, I’m interested in supporting the design of sustainable, resilient, and healthy urban environments where mobility systems work for everyone and everyday movement is both feasible and enjoyable.

PhD

I began my PhD by examining accessibility, a widely employed concept across a variety of disciplines to evaluate the degree to which individuals can reach a desired destination. Conventionally, accessibility is determined by the attractiveness of a destination and the associated travel cost to reach it. However, existing place-based accessibility measures do not differentiate between destinations accessible to individuals from a single demographic group and those accessible to individuals from diverse demographic groups. This hinders our ability to discern the encounter potential of different destinations. In my PhD research, I addressed this gap by introducing co-accessibility as a measure of how accessible a given destination is to different individuals and demographic groups.

If you want to know more about urban co-accessibility you can read my dissertation HERE .




Too long? Then check below the short story of co-accessibility as a comic.


Maps




Projects

New European Bauhaus project · Equity, Social Cohesion, and Safety
Pilsen | Florence | Antwerp
ROUTES will address the current fragmentation between schoolyard and street design transformations by investigating how combined interventions can enhance safety, social cohesion, active mobility, inclusivity, and well-being. Through living laboratories in cities including Bratislava, Espoo, Rotterdam, and Tirana, the project brings together citizens, schools, and local authorities to co-design and test urban transformations, while generating evidence-based tools and guidelines for wider European implementation. The project will run for four years from September 2026.


Across Europe, schools are among the most accessible public facilities, yet their potential as community spaces remains largely untapped. Schoolyards are often inaccessible outside school hours, while surrounding streets can be dominated by traffic and fragmented planning approaches. The new ROUTES project (Reimagining Open Schoolyards and Urban Streets as Equitable Spaces) aims to address this challenge by exploring how integrated transformations of schoolyards and school streets can create safer, healthier, and more inclusive neighbourhoods.

HORIZON PROJECT · Sustainable, Digital, and Green transition
Pilsen | Florence | Antwerp
EU-funded project advancing the sustainable, digital and green transition with practical tools, methods and evidence-based recommendations to make transport systems more efficient, inclusive and environmentally friendly.


While digitalisation holds great promise, it has not yet brought about a full transformation towards sustainability. Across Europe, many smart city initiatives are already using technology to reduce environmental impacts. However, governance systems often struggle to keep pace with rapid technological change, leaving a gap between innovation and implementation. GOLIA seeks to close this gap by developing truly transformative approaches that harness digital tools to advance sustainability in mobility.

ELIDEK Integrated planning for mobility hubs
Athens
The puzzle project aspires to revolutionize planning and operations of urban multimodal transportation systems, by developing an integrated framework and innovative tools for planning and evaluating core aspects of mobility hubs.


Urban multimodal transportation systems integrate different modes and services to provide seamless transportation to travelers. Mobility hubs are a transformative solution to address challenges related to the efficiency and connectivity of multimodal transportation systems, as they expand the role of public transport hubs by serving as pivotal nodes of a multimodal network. The puzzle project aspires to revolutionize planning and operations of urban multimodal transportation systems by developing an integrated framework and innovative tools for planning and evaluating core aspects of mobility hubs. The project envisages introducing a novel approach for identifying prominent mobility hubs, setting up their operations, and assessing their performance.

HORIZON, European Climate, CINEA · Seamless Shared Urban Mobility
The EU co-funded Seamless Shared Urban Mobility (SUM) project aims to transform existing transport networks by introducing New and Shared Mobility (NSM) integrated with public transport (PT).


By 2050, the urban population is expected to account for 82% of the world’s population, posing major challenges for sustainable urban mobility. A shift from private cars to public and shared transport is essential to address problems such as air pollution, congestion and energy consumption. The EU co-funded Seamless Shared Urban Mobility (SUM) project aims to transform existing transport networks by introducing New and Shared Mobility (NSM) integrated with public transport (PT).

EIT Urban Mobility - NEB PROJECT Inclusive, healthy, and public spaces
Izmir
Play Accessible Communities (PAC) İzmir aims to transform micro-mobility hubs into inclusive, healthy public spaces.


Play Accessible Communities (PAC) İzmir aims to transform micro-mobility hubs into inclusive, healthy public spaces. Developed under the EIT Urban Mobility Co-Create New European Bauhaus (NEB) programme, the project brings together Play the City, İzmir Planning Agency, and Transform Transport. PAC promotes accessible neighborhoods by linking mobility with social engagement.

Horizon 2020 Project · Exposome & child mental health
EU-funded project developing exposome-based approaches to understand environments for healthier children.


The EU-funded Equal-Life project will develop and utilise the exposome concept in an integrated study of the external exposome and its social aspects and of measurable internal physiological factors and link those to a child's development and life course mental health. This will be done using a novel approach combining exposure data to characterise, measure, model and understand influences at different developmental stages. The goal is to propose the best supportive environments for all children.



Open Source

accessX
Python Library · Accessibility analysis · Developed with Transform Transport
Open-source Python library for accessibility analysis.


accessX is an open-source Python library for accessibility analysis developed with Transform Transport.

Python Library · Accessibility & Street Centrality Measures
Library for calculating street network centrality and accessibility metrics, and surrounding infrastructure.


A Python library for calculating various street network centrality and accessibility metrics, as well as the size and layout of surrounding pedestrian and bicucly infrastructure.

Python Library · Measuring Pedestrian (co)Accessibility
Tools for estimating prospective social encounters between people from different demographic groups.


A Python library for calculating prospective social encounters between persons from different demographic groups.

Python and Javascript toolkit · Capturing perceived qualities along city streets
Toolkit for estimating perceived safety and attractiveness of city streets via crowd participation.


A Python and Javascript toolkit for calculating perceived safety and attractiveness of city streets through crowd parcipation.

Open data

Datasets

Reusable data produced alongside the maps, tools, and publications above.

ELEV
Athens · Terrain & walking preferences

Terrain-sensitive pedestrian accessibility

15-minute accessibility to everyday amenities under slope-agnostic, slope-adjusted, and walking-preference models.

15M
Athens · Amsterdam · Stockholm

5- and 15-minute walking accessibility

Accessible amenities and public places from each hexagonal cell, ready to explore through CThood.

USE
Barcelona · Rotterdam · Gothenburg

Utilization of outdoor spaces

9,700 activity ratings, 6,388 explanations, and linked street-level imagery.

PER
Frankfurt · Street perception

Perceived safety and attractiveness

Paired ratings, explanations, participants, locations, and descriptive keywords.

CO
Five Dutch cities · Co-accessibility

Pedestrian co-accessibility of urban places

Place-level scores and reachable populations by age group for 5-, 10-, and 15-minute walksheds.


Publications

Selected journal articles and conference papers.

Doctoral dissertation Urban Co-accessibilityTU Delft · 2024 Open dissertation ↗
2026 Transportation Research Part D Journal article · LatestContextualising the impact of street slopes on pedestrian accessibility for sustainable mobility 2025 Environment and Planning B Journal articleAssessing equitable access in X-minute cities through open spatial data 2025 CUPUM 2025 Conference paperCTwalk: A tool for mapping potential inter-population encounters in X-minute neighborhoods 2025 CUPUM 2025 Conference paperPopulation-specific factors of pedestrian accessibility: Bridging practitioner insights and accessibility metrics 2024 Journal of Transport Geography Journal articleBridging or separating? Co-accessibility as a measure of potential place-based encounters 2024 Computational Urban Science Journal articleCrowdsourcing the influence of physical features on the likely use of public open spaces? 2024 AGILE: GIScience Series Conference paper · Best full paperDeveloping a city-specific walkability index through a participatory approach 2024 Landscape and Urban Planning Journal articleHow well do NDVI and OpenStreetMap data capture people’s visual perceptions of urban greenspace? 2023 AGILE: GIScience Series Conference paperIs it safe to be attractive? Disentangling the influence of streetscape features on perceived safety and attractiveness 2023 CUPUM 2023 Conference paper“Eyes on the Street”: Estimating natural surveillance along Amsterdam’s city streets using street-level imagery 2022 Computers, Environment and Urban Systems Journal articleMeasuring spatial age segregation through the lens of co-accessibility to urban activities 2021 Computers, Environment and Urban Systems Journal articleAssessing the influence of point-of-interest features on the classification of place categories


Talks


Selected lectures, workshops, conference presentations, and public conversations.

Guest lecture · Greece

NTUA · School of Architecture

Urban environment, open data, and analytical tools: Opportunities and challenges for urban planning and design.

Invited talk · Athens

Constant Bliss in the City

From accessibility to co-accessibility · Circuits and Currents, Athens School of Fine Arts.

Conference · Thessaloniki

ICTR2025 ↗

CThood: A tool for mapping pedestrian accessibility & uncovering access inequities in X-minute neighborhoods.

Conference · Thessaloniki

ΕΣΧΣΑ

CTwalk and CTstreets: Mapping walkability and pedestrian (co)accessibility through open data.

Demo · Utrecht

NWO ICT.OPEN

First prize demo award for CTwalk Map.

Invited talk

TNO

CTwalk and CTstreets: Exploring walkability and pedestrian (co)accessibility through interactive maps.

Workshop · Helsinki

Equal Life (H2020)

What factors impact access to public spaces and for whom?

Workshop · Massachusetts

CPM · APA

What factors impact access to public spaces and for whom?

Poster · Utrecht

NWO ICT.OPEN

Crowdsourcing perceived qualities of city streets using street-level images.

Conference · Leuven

EHEN

Exposure to street environment features and perceptions of safety and attractiveness.

Invited talk · Delft

TU Delft · CityAI Lab

Computational methods for assessing accessibility.

Interactive market

Towards Healthy Society

How can accessibility promote wellbeing?

Invited talk

HERE Technologies

From POIs to accessibility and beyond.

Conference · Barcelona

EHEN

Co-accessibility: A new lens towards age-inclusive and accessible public spaces.


Teaching

Courses, guest teaching, and MSc supervision across urban analytics, machine learning, and design.

Courses

  • Urban AnalyticsLectures, tutorials & assignmentsMSc · IDE, TU Delft
  • Machine Learning for DesignLectures, tutorials & assignmentsBSc · IDE, TU Delft
  • Urban Data ScienceLectures, tutorials & assignmentsBSc · IDE, TU Delft
  • AI for SocietyGuest lectureMSc · IDE, TU Delft
  • Periscope MOOCOnline course contributionH2020 Periscope
  • Advanced Machine Learning for DesignCourse contributionMSc · IDE, TU Delft
  • Software Based ProductsModeratorBSc · IDE, TU Delft

MSc supervision

Contact

> Email: milias.vasilis@gmail.com

> LinkedIn: vmilias

> Github: MiliasV

> NTUA Page: milias-v

> TT Page: vmilias