Quality Assessment and Accessibility Mapping in an Image-Based Geocrowdsourcing Testbed. - Matthew T. Rice; Dan Jacobson; Dieter Pfoser; Kevin M. Curtin; Han Qin; Kerry Coll; Rebecca M. Rice; Fabiana I. Paez; Ahmad O. Aburizaiza (Cartogr. Int. J. Geogr. Inf. Geovisualization, 2018)