Crowdsourcing is the practice of engaging a ‘crowd’ or group for a common goal often innovation, problem solving, or efficiency. It is powered by new technologies, social media and web 2.0. Crowdsourcing can take place on many different levels and across various industries. Thanks to our growing connectivity, it is now easier than ever for individuals to collectively contribute whether with ideas, time, expertise, or funds to a project or cause. This collective mobilization is crowdsourcing. It is a process of tapping into individuals or groups of people, paid or unpaid who are linked together with a common interest to bring forward powerful increased results through their aggregated actions or activities.

A decade ago, Volunteered Geographical Information (VGI) was identified as a new source of information that would blur the traditional boundary between producers and the consumers of data (Goodchild 2007). This form of information has been recognised by multiple names, including crowdsourced geospatial data (Heipke 2010) and user-generated geographic content (Fast and Rinner 2014), to name but a few. Many applications and services benefit from user-generated content contributed by a wide range of users through crowdsourcing projects. VGI has made it possible for a much wider group of contributors to create and share geographical information. Despite the success and popularity of many VGI projects, such as OpenStreetMap (OSM), researchers continue questioning the reliability and fitness for use of crowdsourced data.