Foundations of Map-based Web Applications - A Survey of the Use, Limits and Opportunities Offered by Digital Maps

Finding a Secure Place: A Map-Based Crowdsourcing System for People With Autism

“…The system addresses the problem of multiple insertions of the same place by suggesting existing entities close to the location selected by the user. Differently from other VGI platforms [36], places are described not only through geographical coordinates, but can be linked to "map units" identified at different zoom levels, like city-blocks and neighborhoods: in this way the system can display only the places associated to a particular "unit," avoiding to overcrowd the map and confound the user. This is enabled by our internal multi-scale topology-aware indexing system, which extracts, from crowd geographical spatial primitives available in OpenStreetMap (OSM) dataset, the map units that are difficult to identify because they are neither institutional nor only physical, linking them to the system's places.…”

FirstLife: Combining Social Networking and VGI to Create an Urban Coordination and Collaboration Platform

“…On the one hand, the underlining platform's model (see section III) responds to the need of integrating heterogeneous information on a geographical basis which are currently scattered across many providers, i.e., institutional portals, organizations websites, Facebook pages, etc. On the other hand, the possibility of filtering information by space (map zoom and bounding box), time (timeline and global calendar), and content (properties, tags and categories) tames the complexity of overcrowded maps [49]. Furthermore, entities are updated in real-time to facilitate coordination and planning at multiple scales (neighborhoods, districts, city) and at different time intervals (hours, days, weeks, months).…”