My PhD focuses on the exploration and utilization of geodata from location based social networks. I'm especially concerned with quality aspects, data integration and the application within spatial data infrastructures.
OSMatrix is a web based geovisual exploration application that visualizes information from the OpenStreetMap project, which is typically not shown on maps. It aims at providing tool to understand OpenStreetMap's user activity, topicality of data as well as number and types of mapped features in order to help identifying areas with unusual activities that might indicate spots with an increased need for quality control.
OpenRouteService is a web-based routing service which is entirely based on OpenStreetMap data and implemented using Open Source technologies and open standards. I am currently involved with the re-design and re-implementation of the client side components.