Mobile Application for Creating and Exporting Geofences

This paper discusses the design and testing of a mobile application for the interactive creation of geofences in the form of polygons. The application allows the visualization of the user's position on GPS maps, the input of the polygon points used to describe each geofence, and the export at any time of the already created geofences to a MongoDB database in GeoJSON format. The Mapbox GL-JS library are used to visualize GPS maps with the user's position, as well as to enter, edit and delete geofences. By leveraging MongoDB's geospatial query capabilities, services can be developed whose logic requires checking for approaching a geofence, entering or leaving in/out of a geofence. The application is used by the authors of the paper to build a database of geofences that describe the contours of historic landmarks that are not visible on GPS street maps because only a portion of the building foundations have been preserved.