Levente Juhász

Levente Juhász
Florida International University | FIU · Geographic Information Systems Center

PhD

About

45
Publications
22,903
Reads
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327
Citations
Introduction
My research interests revolve around understanding the nature of contributions to Volunteered Geographic Information platforms and social media services. I am also interested in using novel, previously unexplored data sources to answer research questions. I enjoy digging deep into data to find patterns.
Additional affiliations
December 2018 - March 2020
Florida International University
Position
  • Research Associate
Description
  • GIS Center
March 2018 - June 2018
Fachhochschule Kärnten
Position
  • Researcher
August 2014 - December 2018
University of Florida
Position
  • Research Assistant
Education
August 2014 - August 2018
University of Florida
Field of study
  • Geomatics
September 2011 - June 2013
University of Szeged
Field of study
  • Geoinformatics

Publications

Publications (45)
Article
Full-text available
In 2016, Niantic Labs released Pokémon Go, an augmented reality smartphone game that attracted millions of users worldwide. This game allows users to " catch " Pokémons through their mobile cameras in different geographic locations that often correspond to prominent places. This paper analyzes the distribution of PokéStops, Pokémon gyms, and spawnp...
Article
Full-text available
User-generated map data is increasingly used by the technology industry for background mapping, navigation and beyond. An example is the integration of OpenStreetMap (OSM) data in widely-used smartphone and web applications, such as Pokémon GO (PGO), a popular augmented reality smartphone game. As a result of OSM's increased popularity, the worldwi...
Article
Full-text available
A proliferation of web-based maps have appeared depicting many different aspects of the spread of the novel coronavirus (SARS-CoV-2). In this commentary, we consider the usage of web-based mapping during the COVID-19 pandemic and argue that web maps have been widely misused for delivering public information on this fast moving, epidemiologically co...
Article
Full-text available
Mapillary is a Web 2.0 application which allows users to contribute crowdsourced street level photographs from all over the world. In the first part of the analysis this article reviews Mapillary data growth for continents and countries as well as the contribution behavior of individual mappers, such as the number of days of active mapping. In the...
Article
Full-text available
This paper presents the results of a study that explored if and how an OpenStreetMap (OSM) data import task can contribute to OSM community growth. Different outreach techniques were used to introduce a building import task to three targeted OSM user groups. First, existing OSM members were contacted and asked to join the data import project. Secon...
Article
Full-text available
This paper explores Null Island, a fictional place located at 0° latitude and 0° longitude in the WGS84 (World Geodetic System 1984) geographic coordinate system. Null Island is erroneously associated with large amounts of geographic data in a wide variety of location-based services, place databases, social media and web-based maps. Whereas it was...
Article
Full-text available
This study mapped and analyzed urban tree canopy change between 2014 and 2019 within the Urban Development Boundary of Miami-Dade County, Florida. The goal was to identify local areas of tree canopy gain or loss over this 5-year period. The comparison is based on land cover maps delineated from WorldView-2 satellite data applying a random forest cl...
Preprint
Full-text available
This paper explores Null Island, a fictional place located at 0$^\circ$ latitude and 0$^\circ$ longitude in the WGS84 geographic coordinate system. Null Island is erroneously associated with large amounts of geographic data in a wide variety of location-based services, place databases, social media and web-based maps. While it was originally consid...
Article
Full-text available
This paper is an Editorial for the Special Issue titled “OpenStreetMap as a multidisciplinary nexus: perspectives, practices and procedures”. The Special Issue is largely based on the talks presented in the 2019 and 2020 editions of the Academic Track at the State of the Map conferences. As such, it represents the most pressing and relevant issues...
Article
Full-text available
The academic community frequently engages with OpenStreetMap (OSM) as a data source and research subject, acknowledging its complex and contextual nature. However, existing literature rarely considers the position of academic research in relation to the OSM community. In this paper we explore the extent and nature of engagement between the academic...
Chapter
Full-text available
Created by volunteers since 2004, OpenStreetMap (OSM) is a global geographic database available under an open access license and currently used by a multitude of actors worldwide. This chapter describes the role played by OSM during the early months (from January to July 2020) of the ongoing COVID-19 pandemic, which - in contrast to past disasters...
Article
Full-text available
Urban systems involve a multitude of closely intertwined components, which are more measurable than before due to new sensors, data collection, and spatio-temporal analysis methods. Turning these data into knowledge to facilitate planning efforts in addressing current challengesnof urban complex systems requires advanced interdisciplinary analysis...
Article
Full-text available
Sea Level Rise (SLR) and storm surges are a threat to coastal communities in South Florida. Residents face the increased frequency of tidal flooding and associated economic losses. This paper presents a web-based SLR impact assessment tool that was developed for the City of Coral Gables, Florida. The tool is able to dynamically visualize the inunda...
Preprint
Full-text available
At the time of writing most governments around the whole world are prioritising the limiting of the spread of the Covid-19 epidemic through a series of lockdown measures affecting schools, sports, leisure, commercial and travel activities. The gradual reversal of these measures is being carried out individually by countries and regions based on the...
Chapter
Full-text available
In less than 150 years our carbon society transformed the planet. Today more than 50% of ecologies in the world are determined by unsustainable industrialization processes. The latest IPCC reports show that we are quickly arriving at points of no return in the warming of our planet. We cannot afford to continue in the same direction, we need a new...
Article
Full-text available
SafeGraph is a commercial provider of massive Point of Interest (POI) data, including visitation patterns in North America. Although the data source does not share specific travel trajectories, the data available includes daily and monthly POI visitation numbers for over 160 categories, as well as information about where visitors come from and whic...
Article
Full-text available
Due to the high demand for cheap construction materials, clay-made brick manufacturing has become a thriving industry in Bangladesh, with manufacturing kilns heavily concentrated in the peripheries of larger cities and towns. These manufacturing sites, known as brickfields, operate using centuries-old technologies which expel dust, ash, black smoke...
Conference Paper
Full-text available
This work presents an initial inquiry into the relations between the Academic and Mapping communities in OpenStreetMap, based on a review of recent publications, interviews of colleagues, and self-reflection of the authors. By this, we aim to understand how and when research-community interactions come to be, what is their nature, and how can these...
Book
Full-text available
State of the Map featured a full day of academic talks. Building upon the motto of SotM 2019 in "Bridging the Map" the Academic Track session was aimed to provide the bridge to join together the experience, understanding, ideas, concepts and skills from different groups of researchers, academics and scientists from around the world. In particular,...
Article
Full-text available
Social media services generate enormous amounts of spatiotemporal data that can be used to characterize and analyze user activities and social behavior. Although crowd-sourced data have the advantage of comprehensive spatial and temporal coverage compared to data collected in more traditional ways, the different social media platforms target differ...
Conference Paper
Full-text available
Numerous online trip planners, such as Google Maps and MapQuest, offer trip recommendations for cycling among other transportation modes. Whereas these platforms are widely used, little is known about the routing criteria embedded into their routing algorithms, and, more specifically, how recommended trips differ from routes travelled by cyclists....
Conference Paper
Full-text available
Spatio-temporal information attached to social media posts allows analysts to study human activity and travel behavior. This study analyzes contribution patterns to the Flickr, Snapchat, and Twitter platforms in over 100 state parks in Central and Northern Florida. The first part of the study correlates monthly visitor count data with the number of...
Chapter
Full-text available
Geo-social media users tend to use different services simultaneously. Whereas significant research attention was put into analyzing contribution patterns to individual social-media platforms, it is less known how the same individual user uses different services. This pilot study analyzes the spatial behavior of users in multiple geo-social media se...
Conference Paper
Full-text available
Snapchat is a widely popular social-media platform among young people. In an update in February 2018, a web-based version of Snap Map was released. Besides using Snapchat for peer-to-peer chatting, users can submit photos and short videos to this feature. Snap Map was found to be useful for the dissemination of breaking news (e.g. protests) and the...
Chapter
Full-text available
A variety of location based services, including navigation, geo-gaming, advertising, and vacation planning, rely on Point of Interest (POI) data. Mapping platforms and social media apps oftentimes host their own geo-datasets which leads to a plethora of data sources from which POIs can be extracted. Therefore it is crucial for an analyst to underst...
Thesis
Full-text available
Volunteered Geographic Information (VGI) refers to spatial data generated by ordinary citizens through their online activities. The era of Web 2.0 experienced a rapid growth both in the number of available VGI platforms and in the number of users who engage in such activities. VGI is already proven to be useful for a number of applications, ranging...
Poster
Full-text available
For the full paper please refer to: Juhász, Levente, and Hartwig H. Hochmair. "Where to catch ‘em all?–a geographic analysis of Pokémon Go locations." Geo-spatial Information Science 20(3), (2017): 241-251. DOI: 10.1080/10095020.2017.1368200
Data
This dataset contains: - Poémon Gym locations - PokéStop locations - Pokémon encounters (with timestamps)
Chapter
Full-text available
An increasing number of crowdsourced geo-data repositories and their services allows volunteer mappers to utilize information from various data sources when contributing data to a crowd-sourced mapping platform. This study explores to which extent OpenStreetMap (OSM) contributors use the crowdsourced street level photo service Mapillary to derive m...
Article
Full-text available
An increasing number of Volunteered Geographic Information (VGI) and social media platforms have been continuously growing in size, which have provided massive georeferenced data in many forms including textual information, photographs, and geoinformation. These georeferenced data have either been actively contributed (e.g., adding data to OpenStre...
Article
Full-text available
Twitter and Instagram are social networking services that allow users to share images. To some extent, both platforms provide means for the user to annotate images with geographic location information. Using a selection of images shared through these two platforms, this study compares the photographer’s position, which is manually estimated from th...
Chapter
Full-text available
Mapillary is a VGI platform which allows users to contribute crowdsourced street level photographs from all over the world. Due to unique information that can be extracted from street level photographs but not from aerial or satellite imagery, such as the content of road signs, users of other VGI Web 2.0 applications start to utilize Mapillary for...
Article
Full-text available
In recent years, the increased frequency of inland excess water in the Carpathian Basin gets more and more attention. The authors developed a web based pilot application for disaster management, with special emphasis on inland excess water hazard management. Free and open source software was used to generate a model, and our work was based on Web G...
Chapter
Full-text available
Mapillary, founded in early 2014, is a Web 2.0 application that allows voluntary users to contribute street level photographs from all over the world. This paper analyses the growth in uploaded data and contributor numbers over time, and assesses data completeness by comparing Mapillary with Google Street View and OpenStreetMap data for selected ci...

Questions

Questions (2)
Question
I am interested in seeing whether the focus of GIScience studies have shifted over the last few decades from being more local or regional in scale towards global. My assumption is that due to the availability and accessibility of global datasets (e.g. user generated data) and technical advancements that make it possible to analyse these datasets triggered a shift in geographic focus.
In a recent review of OpenStreetMap related publications, we found that 6.5% of analyzed publications had a global focus [1] . I was wondering if there are similar review papers that are broader in scope.
Question
I found the IJGIS paper and followed the link to http://opa.openstreetmap.me/ but it looks like the site is down.

Projects

Projects (6)
Project
To understand what implications geographic oddities and fictional places have in digital databases. To understand how people perceive such places.
Archived project
We are happy to announce our full day workshop VGI-HATcH at AGILE 2019. This event is built on top of a series of successful previous pre-conference workshops at AGILE. It will be held on June 17, 2019 in Limassol, Cyprus. More information can be found on the workshop website at http://www.cs.nuim.ie/~pmooney/vgi-hatch2019/. Call for Contributions is listed as a project update. The VGI-HATcH 2019 workshop will be organised and co-chaired by: Peter Mooney: Maynooth University, Ireland Alexander Zipf: University of Heidelberg, Germany Jamal Jokar: Aalborg University Copenhagen, Denmark Hartwig H. Hochmair: University of Florida, United States Levente Juhász: Florida International University, United States