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Create a CityGML Bridge with BridgeParts

  • August 25, 2023
  • 3 replies
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harmen
Contributor
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I'm looking for some help with creating a Bridge in CityGML with two BridgeParts. Those BridgeParts can consists of one or more other objecttypes like BridgeConstructionElements.

 

I've tried many things, but I can not figure out how to create the hierarchy of all the components in CityGML...

Of course using the gml_id and gml_parent_id to connect elements, but unfortunately this somehow doesn't work out the right way.

 

Anyone ?

Like to share the final solution!

 

What I like to see is a hierarchy:

one bridge

consists of two bridgeparts

whereas different bridge elements like constructionelements can be found in both 'bridge' and the two bridgeparts

 

So, something like this (simplified of course):

<Bridge gml_id: BRIDGE>
 
	Bridgepart
	gml_id = part_1
	gml_parent_id = BRIDGE

		BridgeConstructionElement
		gml_id = 563456
		gml_parent_id = part_1

		BridgeConstructionElement
		gml_id = 373648
		gml_parent_id = part_1

		BridgeConstructionElement
		gml_id = 238656
		gml_parent_id = part_1

	BridgePart
	gml_id = part_2
	gml_parent_id = BRIDGE

		BridgeConstructionElement
		gml_id = 956345
		gml_parent_id = part_1

		BridgeConstructionElement
		gml_id = 397364
		gml_parent_id = part_1

		BridgeConstructionElement
		gml_id = 238965
		gml_parent_id = part_1

</Bridge>

 

Best answer by daveatsafe

Hi @Harmen Kampinga​,

To set up the CityGML hierarchy, it is necessary to set both the hierarchy links and roles. For features with geometry, both the LoD and role can be set with the FME Hub transformer CityGMLGeometrySetter. For features without geometry, simple create the attribute citygml_feature_role and set it to appropriate role. These roles are defined in the CityGML Bridge UML, which can be found at https://www.citygmlwiki.org/images/a/a0/CityGML_Bridge.pdf.

I am attaching an updated workspace illustrating how to create a simple Bridge.

Harmen Kampinga - spatial enthusiast
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3 replies

daveatsafe
Safer
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  • daveatsafeSafer
  • Safer
  • Best Answer
  • August 29, 2023

Hi @Harmen Kampinga​,

To set up the CityGML hierarchy, it is necessary to set both the hierarchy links and roles. For features with geometry, both the LoD and role can be set with the FME Hub transformer CityGMLGeometrySetter. For features without geometry, simple create the attribute citygml_feature_role and set it to appropriate role. These roles are defined in the CityGML Bridge UML, which can be found at https://www.citygmlwiki.org/images/a/a0/CityGML_Bridge.pdf.

I am attaching an updated workspace illustrating how to create a simple Bridge.

harmen
Contributor
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  • harmenContributor
  • Author
  • Contributor
  • September 14, 2023

Hi @Harmen Kampinga​,

To set up the CityGML hierarchy, it is necessary to set both the hierarchy links and roles. For features with geometry, both the LoD and role can be set with the FME Hub transformer CityGMLGeometrySetter. For features without geometry, simple create the attribute citygml_feature_role and set it to appropriate role. These roles are defined in the CityGML Bridge UML, which can be found at https://www.citygmlwiki.org/images/a/a0/CityGML_Bridge.pdf.

I am attaching an updated workspace illustrating how to create a simple Bridge.

Thanks @daveatsafe​ ! I will dive into it and let you know!

Harmen Kampinga - spatial enthusiast
harmen
Contributor
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  • harmenContributor
  • Author
  • Contributor
  • September 19, 2023

Hi @Harmen Kampinga​,

To set up the CityGML hierarchy, it is necessary to set both the hierarchy links and roles. For features with geometry, both the LoD and role can be set with the FME Hub transformer CityGMLGeometrySetter. For features without geometry, simple create the attribute citygml_feature_role and set it to appropriate role. These roles are defined in the CityGML Bridge UML, which can be found at https://www.citygmlwiki.org/images/a/a0/CityGML_Bridge.pdf.

I am attaching an updated workspace illustrating how to create a simple Bridge.

This was exactly I was looking for!

Thank you @daveatsafe​ !

Harmen Kampinga - spatial enthusiast

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