| ... | ... | @@ -20,7 +20,7 @@ In the third level of detail, LOD3, buildings are given doors and windows and ad |
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The last level of detail, LOD4, now also models the interior of the building. At this level of detail, rooms are embedded in the building and potentially furnished with equipment elements and furniture. The LOD4 model is definitely suitable, for example, for simulating the spread of pollutants within buildings or for planning and calculating escape routes. An example LOD4 model of a simple building can be downloaded from [here](https://transfer.hft-stuttgart.de/gitlab/coors/3d-stadtmodelle/-/blob/master/Buch-3D-Stadtmodelle/Kap-4/TWINHOUSE_LOD4.gml).
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Other [example data set in CityGML 2.0 LoD 0 to LoD 4](https://schemas.opengis.net/citygml/examples/2.0/building/) is available at the OGC CityGML 2.0 standard repository.
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Other [example data set](https://schemas.opengis.net/citygml/examples/2.0/building/) in CityGML 2.0 LoD0 to LoD4 is available at the OGC CityGML 2.0 standard repository.
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LOD1 and LOD2 are the most common level of details produced by users globally and used in different applications. For some applications, such as noise simulation, an abstract model or a low level of detail (LOD1) is often useful for the analysis and modelling of entire urban areas. In case of urban energy simulation in which individual buildings are simulated, LOD2 models are often used because of its geometrical detail of roof surfaces as well as the introduction of semantic properties. LOD1 and LOD2 models of various cities and districts are usually made available as [open data](https://transfer.hft-stuttgart.de/gitlab/coors/3d-stadtmodelle/-/wikis/DE/Open%20Data). In contrast, due to the high effort involved in creating LOD3 and LOD4 models are often not available for entire urban areas or at most they are available in small excerpts or individual building.
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