Crowdsourcing for individual needs – the case of routing and navigation for mobility-impaired persons

Zipf, Alexander; Mobasheri, Amin; Rousell, Adam; Hahmann, Stefan

doi:10.5334/bax.x

Cited by 25 publications

(24 citation statements)

References 8 publications

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“…Recently, a Visibility algorithm has been implemented into a new version of the route planning service OpenRouteService (www.openrouteservice.org) (Schmitz et al 2008), since this optimization is particularly useful for the pedestrian and wheelchair route planning profiles (Neis and Zielstra 2014;Neis 2015;Zipf et al 2016;Hahmann et al 2016). …”

Section: Discussionmentioning

confidence: 99%

Routing through open spaces – A performance comparison of algorithms

Hahmann

Miksch

Resch

et al. 2017

Geo-spatial Information Science

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Finding the shortest path through open spaces is a well-known challenge for pedestrian routing engines. A common solution is routing on the open space boundary, which causes in most cases an unnecessarily long route. A possible alternative is to create a subgraph within the open space. This paper assesses this approach and investigates its implications for routing engines. A number of algorithms (Grid, Spider-Grid, Visibility, Delaunay, Voronoi, Skeleton) have been evaluated by four different criteria: (i) Number of additional created graph edges, (ii) additional graph creation time, (iii) route computation time, (iv) routing quality. We show that each algorithm has advantages and disadvantages depending on the use case. We identify the algorithms Visibility with a reduced number of edges in the subgraph and Spider-Grid with a large grid size to be a good compromise in many scenarios. ARTICLE HISTORY

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Section: Discussionmentioning

confidence: 99%

Routing through open spaces – A performance comparison of algorithms

Hahmann

Miksch

Resch

et al. 2017

Geo-spatial Information Science

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“…The collective awareness platforms for improving accessibility (CAP4Access) in European cities and regions, was a European project (runtime: January 2014-January 2017) (Institute of Geography, Heidelberg University 2017) aiming to develop and pilot-test methods and tools for collectively gathering and sharing spatial information for improving accessibility (Zipf et al 2016). The aim of the project was to exploit the power of online maps and mobile devices for fostering awareness of barriers for individuals with limited mobility and in turn aid in the removal of such barriers.…”

Section: Introductionmentioning

confidence: 99%

OpenStreetMap data quality enrichment through awareness raising and collective action tools—experiences from a European project

Mobasheri

Zipf

Francis³

2018

Geo-spatial Information Science

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Nowadays, several research projects show interest in employing volunteered geographic information (VGI) to improve their systems through using up-to-date and detailed data. The European project CAP4Access is one of the successful examples of such international-wide research projects that aims to improve the accessibility of people with restricted mobility using crowdsourced data. In this project, OpenStreetMap (OSM) is used to extend OpenRouteService, a well-known routing platform. However, a basic challenge that this project tackled was the incompleteness of OSM data with regards to certain information that is required for wheelchair accessibility (e.g. sidewalk information, kerb data, etc.). In this article, we present the results of initial assessment of sidewalk data in OSM at the beginning of the project as well as our approach in awareness raising and using tools for tagging accessibility data into OSM database for enriching the sidewalk data completeness. Several experiments have been carried out in different European cities, and discussion on the results of the experiments as well as the lessons learned are provided. The lessons learned provide recommendations that help in organizing better mapping party events in the future. We conclude by reporting on how and to what extent the OSM sidewalk data completeness in these study areas have benefited from the mapping parties by the end of the project. ARTICLE HISTORY

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“…Research that focuses on routing specifications for disabled people, such as wheelchair users, blind, deaf or elderly people, has experienced a strong increase in recent years [28][29][30], where some of them use crowdsourced geographic information as their data source [29][30][31][32][33]. An important issue that needs to be considered for such studies is that geo-data requirements may vary significantly depending on the project's purpose.…”

Section: Introductionmentioning

confidence: 99%

Are Crowdsourced Datasets Suitable for Specialized Routing Services? Case Study of OpenStreetMap for Routing of People with Limited Mobility

et al. 2017

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Nowadays, Volunteered Geographic Information (VGI) has increasingly gained attractiveness to both amateur users and professionals. Using data generated from the crowd has become a hot topic for several application domains including transportation. However, there are concerns regarding the quality of such datasets. As one of the most famous crowdsourced mapping platforms, we analyze the fitness for use of OpenStreetMap (OSM) database for routing and navigation of people with limited mobility. We assess the completeness of OSM data regarding sidewalk information. Relevant attributes for sidewalk information such as sidewalk width, incline, surface texture, etc. are considered, and through both extrinsic and intrinsic quality analysis methods, we present the results of fitness for use of OSM data for routing services of disabled persons. Based on empirical results, it is concluded that OSM data of relatively large spatial extents inside all studied cities could be an acceptable region of interest to test and evaluate wheelchair routing and navigation services, as long as other data quality parameters such as positional accuracy and logical consistency are checked and proved to be acceptable. We present an extended version of OSMatrix web service and explore how it is employed to perform spatial and temporal analysis of sidewalk data completeness in OSM. The tool is beneficial for piloting activities, whereas the pilot site planners can query OpenStreetMap and visualize the degree of sidewalk data availability in a certain region of interest. This would allow identifying the areas that data are mostly missing and plan for data collection events. Furthermore, empirical results of data completeness for several OSM data indicators and their potential relation to sidewalk data completeness are presented and discussed. Finally, the article ends with an outlook for future research study in this area.

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Crowdsourcing for individual needs – the case of routing and navigation for mobility-impaired persons

Cited by 25 publications

References 8 publications

Routing through open spaces – A performance comparison of algorithms

Routing through open spaces – A performance comparison of algorithms

OpenStreetMap data quality enrichment through awareness raising and collective action tools—experiences from a European project

Are Crowdsourced Datasets Suitable for Specialized Routing Services? Case Study of OpenStreetMap for Routing of People with Limited Mobility

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