Update Method of Indoor Maps Based on Volunteered Geographic Information (VGI)

With the development of mobile positioning technology and people's indoor activities continuing to increase, the indoor maps as the basis for indoor navigation to express information have become the current research hot spots. Existing methods of indoor maps are mainly based on traditional surveying, spatial entities extraction from CAD (Computer Aided Design) files or obtaining indoor maps through SLAM (Simultaneous Localization And Mapping). However, there are some problems in the above-mentioned methods, such as high data acquisition cost and poor timeliness. In order to overcome the shortcomings of the existing methods, the paper proposes an update method of indoor maps based on VGI (Volunteered Geographic Information). Firstly, the visualization scheme for indoor maps' organization and expression was put forward based on the OpenStreetMap, a VGI open source digital map. Then the key issues of updating and checking indoor maps by volunteers are proposed in the paper. Finally, based on the idea of version update, a multi-level open source architecture using Openlayers, Geoserver and PostGIS was adopted to design and implement a public indoor map service and update system, which verified the feasibility for indoor data updating based on VGI.