| ... | @@ -2,13 +2,91 @@ In LOD3, the shapes of openings such as doors, windows can be modeled in additio |
... | @@ -2,13 +2,91 @@ In LOD3, the shapes of openings such as doors, windows can be modeled in additio |
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analyzes or in visualizations for urban planning, for example in the context of citizen participation.
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analyzes or in visualizations for urban planning, for example in the context of citizen participation.
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Publicly available 3D models in LOD3 are therefore also rare. A simplified UML diagram of CityGML 2.0 LOD3 building object is shown below:
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Publicly available 3D models in LOD3 are therefore also rare. A simplified UML diagram of CityGML 2.0 LOD3 building object is shown below:
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**LOD3 daata model**
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<div align=center>
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Similar to LOD2 building geometry, the CityGML 2.0 standard allows the use of MultiSurface elements to model the boundary surfaces and openings while Solid elements to model a building as a water tight geometry in LOD3.
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</div>
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A XML document of CityGML 2.0 LOD3 building object with building solid geometry will look like this:
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Similar to LOD2 building geometry, the CityGML 2.0 standard allows the use of MultiSurface elements to model the boundary surfaces and openings while Solid elements to model a building as a water tight geometry in LOD3.
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**snippet xml lod3**
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An XML document of CityGML 2.0 LOD3 building object with building solid geometry will look like this:
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```plaintext
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<core:CityModel>
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<core:cityObjectMember>
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<bldg:Building gml:id="Simple_BD1">
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.......
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<bldg:lod3Solid>
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<gml:Solid>
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<gml:exterior>
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<gml:CompositeSurface>
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<gml:surfaceMember xlink:href="#Poly_GML_1" />
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<gml:surfaceMember xlink:href="#Poly_GML_1_w1" />
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<gml:surfaceMember xlink:href="#Poly_GML_" />
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.......
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</gml:CompositeSurface>
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</gml:exterior>
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</gml:Solid>
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</bldg:lod3Solid>
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<bldg:boundedBy>
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<bldg:WallSurface gml:id="GML_1">
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<bldg:lod3MultiSurface>
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<gml:MultiSurface>
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<gml:surfaceMember>
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<gml:Polygon gml:id="Poly_GM_1">
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<gml:exterior>
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<gml:LinearRing>
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.......
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</gml:LinearRing>
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</gml:exterior>
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</gml:Polygon>
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</gml:surfaceMember>
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</gml:MultiSurface>
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</bldg:lod3MultiSurface>
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<bldg:opening>
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<bldg:Window gml:id="GML_1_w1">
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<bldg:lod3MultiSurface>
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<gml:MultiSurface>
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<gml:surfaceMember>
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<gml:Polygon gml:id="Poly_GM_1_w1">
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<gml:exterior>
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<gml:LinearRing">
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.......
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</gml:LinearRing>
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</gml:exterior>
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</gml:Polygon>
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</gml:surfaceMember>
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</gml:MultiSurface>
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</bldg:lod3MultiSurface>
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</bldg:Window>
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</bldg:opening>
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<bldg:opening>
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<bldg:Door gml:id="GML_1_d1">
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<bldg:lod3MultiSurface>
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<gml:MultiSurface>
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<gml:surfaceMember>
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<gml:Polygon gml:id="Poly_GM_1_d11">
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<gml:exterior>
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<gml:LinearRing>
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.......
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</gml:LinearRing>
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</gml:exterior>
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</gml:Polygon>
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</gml:surfaceMember>
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</gml:MultiSurface>
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</bldg:lod3MultiSurface>
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</bldg:Door>
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</bldg:opening>
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</bldg:WallSurface>
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</bldg:boundedBy>
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<bldg:boundedBy>
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.......
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</bldg:boundedBy>
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</bldg:Building>
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</core:cityObjectMember>
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</core:CityModel>
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```
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Below figure shows a graphical representation of CityGML 2.0 LOD3 building object:
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Below figure shows a graphical representation of CityGML 2.0 LOD3 building object:
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