On 1st of November at the Geo users Festival we will organise a workshop in which participants will create their own 3D IMGeo data from 2D IMGeo data and a point cloud (AHN). For this automated 3D data reconstruction, our group has developed open source software software in collaboration with our partners (Kadaster, AMS and NWO). The output can be written to IMGeo 2.1.1, CityGML, OBJ and CityJSON Unfortunately, the Festival is fully booked. But the software (including tutorials) can be found here