OpenStreetMap (OSM) is a community-based, freely available, editable map service created
as an alternative to authoritative sources. Given that it is edited mainly by volunteers with …

User-generated content (UGC) platforms on the Internet have experienced a steep increase
in data contributions in recent years. The ubiquitous usage of location-enabled devices …

Recent years have seen new ways of collecting geographic information via the crowd rather
than organizations. OpenStreetMap (OSM) is a prime example of this approach and has …

Volunteered Geographic Information (VGI) projects and their crowdsourced data have been
the focus of a number of scientific analyses and investigations in recent years. Oftentimes …

About one decade has passed since US vice president Al Gore articulated his vision of
Digital Earth (DE). Within this decade, a global multi-resolution and three-dimensional (3D) …

The last decade has seen a rapid evolution of processing, analysis and visualization of
freely available geographic data using Open Source Web-GIS. In the beginning, Web-based …

Extensive and high-quality geographic data sources are important for any kind of spatial
analysis or application, especially in the field of urban data management. In the last couple …

Volunteered geographic information (VGI) describes the collaborative and voluntary
collection of any kind of spatial data, and has evolved to become an important source for …

High-quality geographic data sources are eminent for urban data management and the
creation of detailed 3D city models. In the past two decades, Volunteered Geographic …

Within the last years, Volunteered Geographic Information (VGI) has developed rapidly and
influenced the world of GIscience significantly. Most prominently, the Open Street Map …