EN/CityGML-Tutorial/chapter-1:-Intro-CityGML.md

@@ -4,7 +4,17 @@ In order to describe a city model, CityGML utilizes thematic modules. The base m
 
 ![CityGML 3.0 Module Overview](uploads/db6d3196812b0a7306be4ac5565e13f1/fig_3.png)
 
-CityGML Module Overview ([OGC 20-066](https://docs.opengeospatial.org/guides/20-066.html))
+CityGML 3.0 Module Overview ([OGC document 20-066](https://docs.opengeospatial.org/guides/20-066.html))
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+The following example shows a CityModel that makes use of several modules including building, vegetation, relief, and transportation.
+
+![3D_DLM_Stoeckach](uploads/5f7b4ff3ea8229a7daa9561c753425a7/3D_DLM_Stoeckach.png)
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+CityGML Model Stuttgart-Stöckach, the model itself was created by L. Rothengass as prt of his Master Thesis at HFT Stuttgart using the software [3dfier](https://github.com/tudelft3d/3dfier) and data provided by the LGL (base DLM and LiDAR data) and the City of Stuttgart (tree cadastre and LoD2 building module). 
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+Reference: L. Rothengass: Generierung und Evaluierung dreidimensionaler Landschaftsmodelle für eine CFD-Windsimulation, Master-Thesis, Vermessung, HFT Stuttgart, SS 2018, Gutachter: Herr Prof. Coors, HFT Stuttgart und Frau Dr. Wild-Pfeiffer, Landesamt für Geoinformation und Landwentwicklung Baden-Württemberg (LGL BW) (in german)
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+
 
 The building model defines the geometric and semantic properties of a building in CityGML. A building or a building part can be modeled as Solid (B-rep) or MultiSurface. The semantic objects for a BoundarySurface geometry in LOD2 are: RoofSurface, WallSurface, GroundSurface, and ClosureSurface.