EN/CityGML-Tutorial/chapter-2:-Building.md

@@ -48,7 +48,11 @@ Example CityGML 2.0 building model of HFT Stuttgart modeled in LOD 1,2 and 3 can
 
 CityGML 3.0 revises the LOD concept, which now allows representing the interior of a building and other CityObjects at any level of detail. LOD4, which is used for representing the interior of objects in CityGML 2.0 is removed and only the LODs 0/1/2/3 remains. The interior of objects can now be integrated with the LODs 0/1/2/3. It is also possible even to model the outside shell of a building in LOD1, while the interiors in LOD2 or 3. 
 
-**Representation of CityGML 3.0 Building in LOD 0 (Left) and LOD2 (Right) with interiors**
+![CityGML3.0_LOD](uploads/0286c8969f6a3c1efbde50bc6c3f89a2/CityGML3.0_LOD.png)
+**Representation of CityGML 3.0 Building in LOD 0 (Left) and LOD2 (Right) with interiors**[^1]
+
+Concerning the data model changes in CityGML 3.0
+
 
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@@ -62,3 +66,4 @@ CityGML 3.0 revises the LOD concept, which now allows representing the interior
 
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+[^1]:[Löwner, M.-O., Gröger, G., Benner, J., Biljecki, F. and Nagel, C. Proposal for a new LOD and Multi-Representation Concept for CityGML. ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci 2016, IV(2/W1), 3–12.](https://doi.org/10.5194/isprs-annals-IV-2-W1-3-2016)
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