Use Case Municipality Rotterdam 2

[RolfJonker]

Use Case Municipality Rotterdam 2

Digital Building Permit Checking based on GeoBIM

When developing a new building, it is important to determine whether the design complies with the regulations applicable to the location where the building is planned. The information needed to check compliance is often spread across various sources. The building regulations shown below require 3D geometry and 3D query functionality to verify compliance.

The regulations are as follows: For the areas designated for a specific function (Centrum-1):
• At the location marked as a passageway, a passageway is mandatory.
• At the location marked as an overhang, an overhang is permitted; however, construction up to the existing overhang is not allowed.
• Buildings within 40 meters from the bank of the Nieuwe Maas must have at least one (emergency) exit that is oriented away from this risk source.

Actor: Architect, Building Developers, Engineers and Permit Checkers

Preconditions

• BIM Model in open IFC format is present and is georeferenced on the right location.
• Regulationmodel is present in Geo-format
• Existing assets likes, building, trees, water, ways, green, surfacemodel etc. Are present at different stakeholders, forming the digital twin city.

Postconditions

• Geosparql can analyse whether a passageway exists geometrically
• Geosparql can analyse whether an overhang exists geometrically
• Geosparql can analyse if the georeferenced IFC BIM-geometry of the Building is within 40 meter from the bank of the Nieuwe Maas (river) (Geo geometry)

Steps

Cadastre company: provides the existing buildings (2D and 3D Geo)
Municipality: provides the existing assets (2D and 3D Geo)
Digitaal Stelsel Omgevingswet (DSO): provides regulation model (2D Geo)
Building developer: provides IFC BIM-model
System: returns a SPARQL result if there exists a passageway/overhang
System: returns a SPARQL result if the BIM model is within 40 meter
Building developer/Permit Checkers: Check of the Sparql result is compliant with the regulation.

[ar-chad]

@RolfJonker

(1) how is BIM model georeferenced in this case?

Is it via setting ifcMapConversion attributes? Those settings do not change coordinates. The software which reads the model would still have to perform coordinate transformations after extracting them from relevant IFC model parts.

(2) with regard to: Geosparql can analyse if the georeferenced IFC BIM-geometry of the Building is within 40 meter from the bank, there are already use cases proposed to measure distances. I believe that metricDWithin function (mentioned here #536) is what you are looking for in this particular case. By IFC BIM-geometry of the Building, do you mean building envelope or some particular geometries the building model consists of?

[ar-chad]

BIM uses implicit geometries. In the example the wall is subtracted by the opening element using the Boolean difference. The door is then placed within the gap in the wall. (Beetz J (2012). Gebruik van 3D gebouw-modellen in 3D GIS: Building information modelling (BIM/IFC) voor beginners (in Dutch). Geonovum 3D Pilot Fase II Slotdag.)

The question here would be, if GeoSPARQL should support this geometry representation.

[RolfJonker]

@RolfJonker

(1) how is BIM model georeferenced in this case?

Is it via setting ifcMapConversion attributes? Those settings do not change coordinates. The software which reads the model would still have to perform coordinate transformations after extracting them from relevant IFC model parts.

(2) with regard to: Geosparql can analyse if the georeferenced IFC BIM-geometry of the Building is within 40 meter from the bank, there are already use cases proposed to measure distances. I believe that metricDWithin function (mentioned here #536) is what you are looking for in this particular case. By IFC BIM-geometry of the Building, do you mean building envelope or some particular geometries the building model consists of?

Question 1: Yes, indeed the BIM-model is georeferenced by the IfcMapconversion attribute.

Question 2: I think that it's correct that the function mentioned in #536 can be used for that.
About the question about the geometry of the building it is not possible to use the building envelope. We need some particular point of the building. For example: "We have different rules for where various measurements must be taken. We measure perpendicularly from the contour of the ground floor, while for other measurements, we measure perpendicularly from the contour of the furthest projecting point. In the case of a sloping building (e.g., the KPN building in Rotterdam, Boijmans Depot), where the emergency exit is on the first floor (e.g., the cruise terminal in Rotterdam), the measurement is taken from the lowest point in the façade on that floor, providing access to the outdoor space for example the terrace."