Public Participation GIS:a FOSS architecture enabling field-data collection

Driven by the rise of Web 2.0 and the non-stop spread of mobile device sensors,the concept of Public Participation GIS(PPGIS)is knowing a revolutionary era which perfectly fits the new vision of Digital Earth(DE).This research investigates the opportunity to build up a PPGIS prototype with completely Free and Open Source Software(FOSS)architecture,in which data directly come from field surveys carried out by users.A sample application related to urban monitoring is addressed,which concentrates on user field-collected data concerning reports of road pavement damages.Open Data Kit suite allows users to collect geotagged multimedia information using mobile devices with onboard location sensors(e.g.a Global Positioning System receiver).On field-captured data are sent to a server and stored into a PostgreSQL database with PostGIS spatial extension.GeoServer then disseminates data on the Web.On the client-side,different solutions allow data visualization on both desktop computers and mobile devices.The designed architecture provided support for FOSS usage in the process of gathering,uploading,and Web publishing information collected in situ.The implementation of the developed PPGIS could thus substantially increase public active participation in data creation and sharing,besides enlarging DE knowledge up to the local level.