Olle Järv
Biographic Data
| ID | 2744352 |
|---|---|
| NAME | Olle Järv |
| GIVEN NAMES | Olle |
| FAMILY NAME | Järv |
| SIGNATURE | JÄRV O |
| AFFILIATIONS | University of Helsinki |
| ORCID | 0000-0003-3446-1545 |
| VERIFIED | Yes |
| TOTAL WORKS | 25 |
| TOTAL CITATIONS | 57 |
| AUTHOR COUNT | 25 |
| EDITOR COUNT | 0 |
| FIRST PUBLICATION YEAR | 2010 |
| LATEST PUBLICATION YEAR | 2026 |
| H-INDEX | 4 |
Fraudulent participation in online surveys in the age of AI
Online surveys and remote recruitment have become central to contemporary human-subject research because they broaden reach, lower costs, and enable more flexible participation. However, these advantages also introduce new risks to participant authenticity and data integrity. Here, we draw on a multi-phase study of how remote work arrangements affect employees’ work and personal life to highlight an emerging methodological challenge: fraudulent p…
Mapping flows, shaping spaces
Knowing where, how and for what purposes people frequently cross borders has significant policy implications. However, limited data availability often hinders effective decision-making. The lack of granular, reliable and comparable data frequently leads to an underestimation of the true scale of cross-border movements within the EU. Additionally, the assessment of the socioeconomic potential of border regions does not consider the hypothetical el…
Cross-border functional areas (CBFA)
Functional cross-border integration in Europe has intensified over recent decades as liberalization processes have increased border permeability. Given its policy relevance, the underlying mechanisms have been widely studied. However, existing approaches to measuring cross-border functionality and identifying cross-border functional areas (CBFAs) remain fragmented and methodologically diverse. The lack of pan-European data at a fine scale has als…
Mapping urban vitality through dynamic population presence
Urban vitality (UV) is a commonly used concept that describes the liveliness, diversity, and attractiveness of urban spaces, which foster social interaction and activity. While the concept has received ample attention from researchers, combining big data and traditional data sources to capture UV remains underexplored. To address this gap, we build on contemporary interpretations of Jane Jacobs’s concept of vitality to develop a methodology that …
Digital Transition and New Forms of Spatial Inequality
This thematic issue examines how digital transition reshapes spatial inequalities by reconfiguring relationships between people, places, and opportunities. We frame the contributions around three interrelated mechanisms—place attractiveness, access to opportunities, and the coordination of activities— that operate through housing and labour markets. Digital transition reshapes all three mechanisms, generating spatially uneven outcomes across the …
The Impacts of Remote Work on Residential Space
Remote work has emerged as one of the more consequential transformations in contemporary society, with far‐reaching implications that extend beyond the organisation of work itself. One of its most profound, yet still insufficiently understood, consequences concerns residential space. By redefining the traditional spatial coupling between workplace and home, remote work offers many individuals greater freedom in choosing where to live, thereby hav…
Twin Transition Attitudes and Regional Left‐Behindness
This article investigates how individual attitudes toward the green and digital transitions, collectively referred to as the twin transition, and expressions of regional left‐behindness shape EU interregional migration intentions across different life domains. The study disaggregates migration intentions by motive, work, education, quality of life, and retirement, to better understand the interplay between personal values and regional structural …
The socio-cultural values of ecosystem services in managed, semi-managed and low-managed urban blue spaces and their surroundings. A case study of Warsaw, Poland
Urban blue spaces provide important ecosystem services (ES), that support health and well-being of city residents. This study examined residents' perceptions of ES provided by managed, semi-managed and low-managed blue spaces and their surroundings in Warsaw, a city dominated by the River Vistula which flows through its centre and is partially unregulated. We conducted a geo-questionnaire, asking respondents to mark their favourite blue spaces an…
Reimagining functional cross-border regions in Europe through the mobilities of people
Cross-border interactions of people contribute to the (re)production of functional cross-border regions, yet they remain underexplored. We have addressed this by proposing a conceptual framework stemming from the mobility approach and mobile big data. Using geolocated social media data as a proof-of-concept, we empirically examined people’s mobilities across all the internal border regions in Europe. We distinguished between cross-border regions …
Spatial Integration or Isolation? Capturing the Rhythms of Daily Lives Across Neighbourhoods in Helsinki Using Mobile Phone Data
People's exposure to various social and spatial contexts over time leads to patterns of spatial integration and segregation. While the study of spatial integration has predominantly focused on the location and context of residential neighbourhoods, the emerging activity space approach to segregation argues that it is important to consider people's actual activity locations and mobility. This study builds on both approaches, to provide insights in…
New avenues for second home tourism research using big data
The phenomenon of owning and visiting a second home is broadening beyond tourism due to the increase in remote working and multi-local living - people living in multiple residences. To understand people, places, and mobility linked to second homes and its implications to society better, new complementary data sources are needed to provide timely and adequate information on temporal patterns and changes in second home use. Big data sources have be…
Revealing mobilities of people to understand cross-border regions
The cross-border practices of people beyond migration and tourism are often overlooked. However, the increase of frequent social interactions and mobilities of people crossing country borders for work, shopping, services and leisure contribute to (re)shaping functional cross-border regions. We propose a conceptual framework using a big data approach to provide new insights from the individual-level cross-border mobility of people. We used Twitter…
Segregation and the pandemic
In this study, we set out to understand how the changes in daily mobility of people during the first wave of the COVID-19 pandemic in spring 2020 influenced daytime spatial segregation. Rather than focusing on spatial separation, we approached this task from the perspective of daytime socio-spatial diversity - the degree to which people from socially different neighbourhoods share urban space during the day. By applying mobile phone data from Gre…
Capturing urban diversity through languages
Contemporary cities are becoming highly diverse on an unprecedented scale due to accelerating urbanization, international migration and mobility. Research on urban diversity commonly focuses on ethnicities and countries of origin, disregarding equally informative characteristics, such as information on languages and language use, which might reveal new aspects of urban diversity. In this paper, we analyse the development of urban diversity in the…
Mapping urban linguistic diversity with social media and population register data
Globalization, urbanization and international mobility have led to increasingly diverse urban populations. Compared to traditional traits for measuring urban diversity, such as ethnicity and country of origin, the role of language remains underexplored in understanding diversity, interactions between different groups and socio-spatial segregation. In this article, we analyse language use in the Helsinki Metropolitan Area by combining individual-l…
The effect of Covid-19 on cross-border mobilities of people and functional border regions
Mobility is a global megatrend in our contemporary world as people are constantly crossing nation-state borders for migration, tourism, work and due to mobile transnational lives. Cross-border practices contribute to (re)produce functional border regions between different countries. The current amount of information on the geographies of cross-border mobilities of people, the creation of functional cross-border regions and how these regions chang…
Escaping from Cities during the Covid-19 Crisis
The coronavirus disease 2019 (COVID-19) crisis resulted in unprecedented changes in the spatial mobility of people across societies due to the restrictions imposed. This also resulted in unexpected mobility and population dynamics that created a challenge for crisis preparedness, including the mobility from cities during the crisis due to the underlying phenomenon of multi-local living. People changing their residences can spread the virus betwee…
The Link Between Ethnic Segregation and Socio‐Economic Status
The extent to which ethnic segregation results from differences in socio‐economic factors remains a seminal topic of debate. The growing literature demonstrating the multifaceted phenomenon of segregation urges more focus on individuals’ spatial and social interactions. We applied an activity space approach and considered ethnic differences in individuals’ activity spaces as an indicator of spatial segregation. We used mobile phone and survey dat…
Understanding the use of urban green spaces from user-generated geographic information
Parks and other green spaces are an important part of sustainable, healthy and socially equal urban environment. Urban planning and green space management benefit from information about green space use and values, but such data are often scarce and laborious to collect. Temporally dynamic geographic information generated by different mobile devices and social media platforms are a promising source of data for studying green spaces. User-generated…
Covid-19 is spatial
The mobility restrictions related to COVID-19 pandemic have resulted in the biggest disruption to individual mobilities in modern times. The crisis is clearly spatial in nature, and examining the geographical aspect is important in understanding the broad implications of the pandemic. The avalanche of mobile Big Data makes it possible to study the spatial effects of the crisis with spatiotemporal detail at the national and global scales. However,…
Social media data for conservation science
Improved understanding of human-nature interactions is crucial to conservation science and practice, but collecting relevant data remains challenging. Recently, social media have become an increasingly important source of information on human-nature interactions. However, the use of advanced methods for analysing social media is still limited, and social media data are not used to their full potential. In this article, we present available source…
Dynamic cities
The concept of accessibility – the potential of opportunities for interaction – binds together the key physical components of urban structure: people, transport and social activity locations. Most often these components are dynamic in nature and hence the accessibility landscape changes in space and time based on people's mobilities and the temporality of the transport network and activity locations (e.g. services). Person-based accessibility app…
Ethnic differences in activity spaces as a characteristic of segregation
Given ongoing developments altering social and spatial cohesion in urban societies, a more comprehensive understanding of segregation is needed. Taking the ‘mobilities turn’ at heart, we move beyond place-based segregation approaches and focus on the practised urban experiences of individuals through a more comprehensive assessment of their activity spaces. This study contributes to people-based segregation research by mapping the activity spaces…
Understanding monthly variability in human activity spaces
Using Mobile Positioning Data to Model Locations Meaningful to Users of Mobile Phones
The article introduces a model for the location of meaningful places for mobile telephone users, such as home and work anchor points, using passive mobile positioning data. Passive mobile positioning data is secondary data concerning the location of call activities or handovers in network cells that is automatically stored in the memory of service providers. This data source offers good potential for the monitoring of the geography and mobility o…
Ethnic differences in activity spaces as a characteristic of segregation
Given ongoing developments altering social and spatial cohesion in urban societies, a more comprehensive understanding of segregation is needed. Taking the ‘mobilities turn’ at heart, we move beyond place-based segregation approaches and focus on the practised urban experiences of individuals through a more comprehensive assessment of their activity spaces. This study contributes to people-based segregation research by mapping the activity spaces…
Covid-19 is spatial
The mobility restrictions related to COVID-19 pandemic have resulted in the biggest disruption to individual mobilities in modern times. The crisis is clearly spatial in nature, and examining the geographical aspect is important in understanding the broad implications of the pandemic. The avalanche of mobile Big Data makes it possible to study the spatial effects of the crisis with spatiotemporal detail at the national and global scales. However,…
The Link Between Ethnic Segregation and Socio‐Economic Status
The extent to which ethnic segregation results from differences in socio‐economic factors remains a seminal topic of debate. The growing literature demonstrating the multifaceted phenomenon of segregation urges more focus on individuals’ spatial and social interactions. We applied an activity space approach and considered ethnic differences in individuals’ activity spaces as an indicator of spatial segregation. We used mobile phone and survey dat…
The effect of Covid-19 on cross-border mobilities of people and functional border regions
Mobility is a global megatrend in our contemporary world as people are constantly crossing nation-state borders for migration, tourism, work and due to mobile transnational lives. Cross-border practices contribute to (re)produce functional border regions between different countries. The current amount of information on the geographies of cross-border mobilities of people, the creation of functional cross-border regions and how these regions chang…
Spatial Integration or Isolation? Capturing the Rhythms of Daily Lives Across Neighbourhoods in Helsinki Using Mobile Phone Data
People's exposure to various social and spatial contexts over time leads to patterns of spatial integration and segregation. While the study of spatial integration has predominantly focused on the location and context of residential neighbourhoods, the emerging activity space approach to segregation argues that it is important to consider people's actual activity locations and mobility. This study builds on both approaches, to provide insights in…
Capturing urban diversity through languages
Contemporary cities are becoming highly diverse on an unprecedented scale due to accelerating urbanization, international migration and mobility. Research on urban diversity commonly focuses on ethnicities and countries of origin, disregarding equally informative characteristics, such as information on languages and language use, which might reveal new aspects of urban diversity. In this paper, we analyse the development of urban diversity in the…
Using Mobile Positioning Data to Model Locations Meaningful to Users of Mobile Phones
The article introduces a model for the location of meaningful places for mobile telephone users, such as home and work anchor points, using passive mobile positioning data. Passive mobile positioning data is secondary data concerning the location of call activities or handovers in network cells that is automatically stored in the memory of service providers. This data source offers good potential for the monitoring of the geography and mobility o…
Understanding monthly variability in human activity spaces
Ethnic differences in activity spaces as a characteristic of segregation
Given ongoing developments altering social and spatial cohesion in urban societies, a more comprehensive understanding of segregation is needed. Taking the ‘mobilities turn’ at heart, we move beyond place-based segregation approaches and focus on the practised urban experiences of individuals through a more comprehensive assessment of their activity spaces. This study contributes to people-based segregation research by mapping the activity spaces…
Dynamic cities
The concept of accessibility – the potential of opportunities for interaction – binds together the key physical components of urban structure: people, transport and social activity locations. Most often these components are dynamic in nature and hence the accessibility landscape changes in space and time based on people's mobilities and the temporality of the transport network and activity locations (e.g. services). Person-based accessibility app…
Social media data for conservation science
Improved understanding of human-nature interactions is crucial to conservation science and practice, but collecting relevant data remains challenging. Recently, social media have become an increasingly important source of information on human-nature interactions. However, the use of advanced methods for analysing social media is still limited, and social media data are not used to their full potential. In this article, we present available source…
Understanding the use of urban green spaces from user-generated geographic information
Parks and other green spaces are an important part of sustainable, healthy and socially equal urban environment. Urban planning and green space management benefit from information about green space use and values, but such data are often scarce and laborious to collect. Temporally dynamic geographic information generated by different mobile devices and social media platforms are a promising source of data for studying green spaces. User-generated…
Covid-19 is spatial
The mobility restrictions related to COVID-19 pandemic have resulted in the biggest disruption to individual mobilities in modern times. The crisis is clearly spatial in nature, and examining the geographical aspect is important in understanding the broad implications of the pandemic. The avalanche of mobile Big Data makes it possible to study the spatial effects of the crisis with spatiotemporal detail at the national and global scales. However,…
Escaping from Cities during the Covid-19 Crisis
The coronavirus disease 2019 (COVID-19) crisis resulted in unprecedented changes in the spatial mobility of people across societies due to the restrictions imposed. This also resulted in unexpected mobility and population dynamics that created a challenge for crisis preparedness, including the mobility from cities during the crisis due to the underlying phenomenon of multi-local living. People changing their residences can spread the virus betwee…
The Link Between Ethnic Segregation and Socio‐Economic Status
The extent to which ethnic segregation results from differences in socio‐economic factors remains a seminal topic of debate. The growing literature demonstrating the multifaceted phenomenon of segregation urges more focus on individuals’ spatial and social interactions. We applied an activity space approach and considered ethnic differences in individuals’ activity spaces as an indicator of spatial segregation. We used mobile phone and survey dat…
Mapping urban linguistic diversity with social media and population register data
Globalization, urbanization and international mobility have led to increasingly diverse urban populations. Compared to traditional traits for measuring urban diversity, such as ethnicity and country of origin, the role of language remains underexplored in understanding diversity, interactions between different groups and socio-spatial segregation. In this article, we analyse language use in the Helsinki Metropolitan Area by combining individual-l…
The effect of Covid-19 on cross-border mobilities of people and functional border regions
Mobility is a global megatrend in our contemporary world as people are constantly crossing nation-state borders for migration, tourism, work and due to mobile transnational lives. Cross-border practices contribute to (re)produce functional border regions between different countries. The current amount of information on the geographies of cross-border mobilities of people, the creation of functional cross-border regions and how these regions chang…
New avenues for second home tourism research using big data
The phenomenon of owning and visiting a second home is broadening beyond tourism due to the increase in remote working and multi-local living - people living in multiple residences. To understand people, places, and mobility linked to second homes and its implications to society better, new complementary data sources are needed to provide timely and adequate information on temporal patterns and changes in second home use. Big data sources have be…
Revealing mobilities of people to understand cross-border regions
The cross-border practices of people beyond migration and tourism are often overlooked. However, the increase of frequent social interactions and mobilities of people crossing country borders for work, shopping, services and leisure contribute to (re)shaping functional cross-border regions. We propose a conceptual framework using a big data approach to provide new insights from the individual-level cross-border mobility of people. We used Twitter…
Segregation and the pandemic
In this study, we set out to understand how the changes in daily mobility of people during the first wave of the COVID-19 pandemic in spring 2020 influenced daytime spatial segregation. Rather than focusing on spatial separation, we approached this task from the perspective of daytime socio-spatial diversity - the degree to which people from socially different neighbourhoods share urban space during the day. By applying mobile phone data from Gre…
Capturing urban diversity through languages
Contemporary cities are becoming highly diverse on an unprecedented scale due to accelerating urbanization, international migration and mobility. Research on urban diversity commonly focuses on ethnicities and countries of origin, disregarding equally informative characteristics, such as information on languages and language use, which might reveal new aspects of urban diversity. In this paper, we analyse the development of urban diversity in the…
Spatial Integration or Isolation? Capturing the Rhythms of Daily Lives Across Neighbourhoods in Helsinki Using Mobile Phone Data
People's exposure to various social and spatial contexts over time leads to patterns of spatial integration and segregation. While the study of spatial integration has predominantly focused on the location and context of residential neighbourhoods, the emerging activity space approach to segregation argues that it is important to consider people's actual activity locations and mobility. This study builds on both approaches, to provide insights in…
Fraudulent participation in online surveys in the age of AI
Online surveys and remote recruitment have become central to contemporary human-subject research because they broaden reach, lower costs, and enable more flexible participation. However, these advantages also introduce new risks to participant authenticity and data integrity. Here, we draw on a multi-phase study of how remote work arrangements affect employees’ work and personal life to highlight an emerging methodological challenge: fraudulent p…
Mapping flows, shaping spaces
Knowing where, how and for what purposes people frequently cross borders has significant policy implications. However, limited data availability often hinders effective decision-making. The lack of granular, reliable and comparable data frequently leads to an underestimation of the true scale of cross-border movements within the EU. Additionally, the assessment of the socioeconomic potential of border regions does not consider the hypothetical el…
Cross-border functional areas (CBFA)
Functional cross-border integration in Europe has intensified over recent decades as liberalization processes have increased border permeability. Given its policy relevance, the underlying mechanisms have been widely studied. However, existing approaches to measuring cross-border functionality and identifying cross-border functional areas (CBFAs) remain fragmented and methodologically diverse. The lack of pan-European data at a fine scale has als…
Mapping urban vitality through dynamic population presence
Urban vitality (UV) is a commonly used concept that describes the liveliness, diversity, and attractiveness of urban spaces, which foster social interaction and activity. While the concept has received ample attention from researchers, combining big data and traditional data sources to capture UV remains underexplored. To address this gap, we build on contemporary interpretations of Jane Jacobs’s concept of vitality to develop a methodology that …
Digital Transition and New Forms of Spatial Inequality
This thematic issue examines how digital transition reshapes spatial inequalities by reconfiguring relationships between people, places, and opportunities. We frame the contributions around three interrelated mechanisms—place attractiveness, access to opportunities, and the coordination of activities— that operate through housing and labour markets. Digital transition reshapes all three mechanisms, generating spatially uneven outcomes across the …
The Impacts of Remote Work on Residential Space
Remote work has emerged as one of the more consequential transformations in contemporary society, with far‐reaching implications that extend beyond the organisation of work itself. One of its most profound, yet still insufficiently understood, consequences concerns residential space. By redefining the traditional spatial coupling between workplace and home, remote work offers many individuals greater freedom in choosing where to live, thereby hav…
Twin Transition Attitudes and Regional Left‐Behindness
This article investigates how individual attitudes toward the green and digital transitions, collectively referred to as the twin transition, and expressions of regional left‐behindness shape EU interregional migration intentions across different life domains. The study disaggregates migration intentions by motive, work, education, quality of life, and retirement, to better understand the interplay between personal values and regional structural …
The socio-cultural values of ecosystem services in managed, semi-managed and low-managed urban blue spaces and their surroundings. A case study of Warsaw, Poland
Urban blue spaces provide important ecosystem services (ES), that support health and well-being of city residents. This study examined residents' perceptions of ES provided by managed, semi-managed and low-managed blue spaces and their surroundings in Warsaw, a city dominated by the River Vistula which flows through its centre and is partially unregulated. We conducted a geo-questionnaire, asking respondents to mark their favourite blue spaces an…
Reimagining functional cross-border regions in Europe through the mobilities of people
Cross-border interactions of people contribute to the (re)production of functional cross-border regions, yet they remain underexplored. We have addressed this by proposing a conceptual framework stemming from the mobility approach and mobile big data. Using geolocated social media data as a proof-of-concept, we empirically examined people’s mobilities across all the internal border regions in Europe. We distinguished between cross-border regions …
Geography (14 works) · Human Mobility and Location-Based Analysis (12 works) · Computer Science (11 works) · Sociology (10 works) · Urban Transport and Accessibility (10 works) · Economic geography (6 works) · Population (6 works) · Cross-Border Cooperation and Integration (5 works) · Data science (5 works) · Ethnic group (5 works)