  In this paper we present our workflow to automatically reconstruct 3D
building models based on 2D building polygons and a LiDAR point cloud. The
workflow generates models at different levels of detail (LoDs) to support data
requirements of different applications from one consistent source. Specific
attention has been paid to make the workflow robust to quickly run a new
iteration in case of improvements in an algorithm or in case new input data
become available. The quality of the reconstructed data highly depends on the
quality of the input data and is monitored in several steps of the process. A
3D viewer has been developed to view and download the openly available 3D data
at different LoDs in different formats. The workflow has been applied to all 10
million buildings of The Netherlands. The 3D service will be updated after new
input data becomes available.
