Progress report on a review of IFG - ISO... · Progress report on a review of IFG DIBK AEC3...

Progress report on a review of IFG

DIBK AEC3 Mariboes gate 13 High Wycombe

0183 OSLO HP15 6HP

IFG – IFC for GIS 2004-2006

Overview

• IFG fed into IFC4 with a 10 year interval• buildingSMART Model Setup MVD

currently meeting• Can we encourage implementation ?

Terms of reference1. Refresh the knowledge from the IFG project. Recovery and

identification of IFG 2005 primary material. Review and prepare the background studies for publication.

2. Check the proposed changes are in IFC4 Review of entities, property sets and classification. Review the use of library references to link to feature catalogues.

3. Review of IFG Use cases and exchange requirements. Ensure they support mapping as a context for design engineering.

4. Guidelines for implementers. How to use the georeferencingcapability. How to use the new entities. Use of library references for feature catalogues. Expected and recommended attributes.

5. Evaluate the method used for IFG integration• . Current project integration methods• Role of mvd and mvdXML.• Role of bsDD and local dictionaries, • EU INSPIRE directives and GEMINI.• Impact of point clouds and LIDAR type data. • Communication of accuracy and suitability.

IFGGe

opsp

atia

l

Geog

raph

ic F

eatu

res

Obj

ectif

icat

ion

Back

grou

nd k

now

ledg

e

Exte

nsio

n pr

ojec

ts

Dict

iona

ries

Suita

bilit

y

Accu

racy

Relia

bilit

y

Extension projects

Aspect Before IFG IFG Aquarium Currently

Scope Extension topic Whole domain Single use case Whole domain

Scenarios Whole domainGIS-BIM interface Single scenario Aspects of domain

Overview Domain Selected transactions Single transaction Selected transactions

Participants Two chapters One sponsor Several users Multiple sponsors

SupportTwo application developers Optional Several developers Optional

Diagram IDEF0 (now SBP) Four parties None BPMN

Transaction Output->Input Use cases Singular Exchange requirement

Documentation Reports Progress report Report IfcDoc

Implementation New sub-schemas Use case Functional part ConceptActions arising Change requests Change requests n/a Change requests

Deliverables n/a Usage notes Usage notes Documentation

Objectification

Geospatial / Geo location

Project

Product Representation Shape Representation

Projected CRSMap Conversion

Rel Aggregates

Site

Geometric Representation Context

Block

Eastings: 0Northing: 0

OrthogonalHeight: 0XAxisAbscissa: 0XAxisOrdinate: 0

Scale: 1

Name: EPSG:25832Description: ETRS89 /

UTM zone 32NGeodeticDatum:

ETRS89VerticalDatum:

Hamburg HarbourMapProjection: zzz

MapZone: yyyMapUnit: kilometre

TrueNorth: (WGS84)

RefLat: (WGS84)RefLong (WGS84) RefElev: (WGS84)

n

n

IFC4 Geolocation

n n

Key

• Dark blue ifc2x3 and ifc4• Light blue ifc4 additions• Upright: mandatory attributes• Italic: optional attributes• Full arrow: mandatory relationship• Dotted arrow: optional relationship

SummaryIFCPROJECT

Has a list of many IFCGEOMETRICCONTEXTSHas an IFCAGGREGATES with many IFCSITEs

IFCGEOMETRICREPRESENTATIONHas an optional WGS84 north orientationIs pointed to by an IFCMAPCONVERSIONPoints to an IFCPROJECTEDCRSIs pointed to by IFCSHAPEREPRESENTATATIONs

IFCSHAPEREPRESENTATION Contains an IFCBLOCK Is contained in an IFCPRODUCTRERESENTATION which is pointed to by

each IFCSITEIFCSITE

Has optional WGS84 latitude, longitude, elevationIFCMAPCONVERSION

Has six measurementsIFCPROJECTEDCRS

Has six string attributes

IFC4

• IfcExternalSpatialElementTypeEnum• IfcGeographicElementTypeEnum• IfcExternalSpatialElement• IfcInternalOrExternalEnum• EXTERNAL_EARTH• EXTERNAL_WATER• EXTERNAL_FIRE• IfcSpaceTypeEnum• SPACE• PARKING• GFA• INTERNAL• EXTERNAL• IfcGeographicElement• IfcGeographicElementType• IfcCoordinateReferenceSystem• IfcMapConversion• IfcProductRepresentation• IfcProjectedCRS

IFC4Property Sets

• Pset_AnnotationContourLine• Pset_AnnotationLineOfSight• Pset_AnnotationSurveyArea• Pset_LandRegistration• Pset_PropertyAgreement• Pset_SpaceParking

Topography and TINs

Use cases / Scenario

• Backgrounding– Also linked open data for weather and services and geo-naming

• Analysis– Control – and constraints– Planning volumes and areas, setbacks

• Proposal– Set-up (new)– set-out

• Update – Update of map and community data

Topics

• General– Also linked open data for weather and services and geo-naming

• Area– Control – and constraints– Planning volumes and areas, setbacks

• Distribution– Set-up (new)– set-out

• Construction– Update of map and community data

•

Dictionary

IfcAnnotation (IFC)o contour (en-GB)o Hoydekurve (no-NO)

IfcGeographicElement (IFC)o curve (en-GB)o kurve (no-NO)

IfcGeographicElement (IFC)o road (en-GB)o Vei (no-NO)o vei (no-NO)

IfcBuilding (IFC)o building (en-GB)o Bygning (no-NO)o bygg (no-NO)

IfcSite (IFC)o District (en-GB)o Kommune (no-NO)

IfcGeographicElement (IFC)o tree (en-GB)o tre (no-NO)o Tre (no-NO)

RevisionDate (IFC)o Revision Date (en-GB)o dato (no-NO)

Kommune 219

Report 3: Whittlesey Washes

Chainage origin• CH 0• 1.001

• TF 39775 02968• 539775.42mE• 302967.59mN

By gradientSloping: blue Flat: turquoise

landXML mapped _fromLandXML to IFCrendered by Tekla BimSight

landXML mapped _fromLandXML to IFCrendered by Tekla BimSight

By facing direction South: yellow Flat: turquoise

• BH06• 3rd strata• Embankment fill• 0.100m

Borehole Spreadsheet enhanced to BS5930:1999Mapped _fromSpreadsheet to IFCRendered in UNN Xbim Xplorer

39 !

Air frost values summed to an answer of: 39 days

Figure 4 Executed Query Results on Dataset

KIT – Universität des Landes Baden-Württemberg undnationales Forschungszentrum in der Helmholtz-Gemeinschaft

Institut für Angewandte Informatik

www.kit.edu

IFC4 – Implementation Guidancefor Georeferencing

Institut für Angewandte Informatik25

IFC4 Entities required

use IFC4-Add1 due to some minor corrections also in scope of geo-referencinghttp://www.buildingsmart-tech.org/ifc/review/IFC4Add1/beta/html/

(ABS) IfcCoordinateReferenceSystem URL└ IfcProjectedCRS URL

(ABS) IfcCoordinateOperation URL└ IfcMapConversion URL

(ABS) IfcRepresentationContext URL└ IfcGeometricRepresentationContext URL

IfcProject URL

Andreas Geiger, Karl-Heinz Häfele19.08.2014


IfcProjectedCRSENTITY IfcCoordinateReferenceSystem

ABSTRACT SUPERTYPE OF(IfcProjectedCRS);Name : IfcLabel;Description : OPTIONAL IfcText;GeodeticDatum : OPTIONAL IfcIdentifier;VerticalDatum : OPTIONAL IfcIdentifier;

END_ENTITY;

ENTITY IfcProjectedCRSSUBTYPE OF IfcCoordinateReferenceSystem;

MapProjection : OPTIONAL IfcIdentifier;MapZone : OPTIONAL IfcIdentifier;MapUnit : OPTIONAL IfcNamedUnit;

WHEREIsLengthUnit : NOT(EXISTS(MapUnit)) OR (MapUnit.UnitType = IfcUnitEnum.LENGTHUNIT);

END_ENTITY;

Examples:#1= IFCPROJECTEDCRS ('EPSG:25832','ETRS89 / UTM zone 32N','ETRS89',$,$,$,$);#2= IFCPROJECTEDCRS ('EPSG:31467','DHDN / Gauss-Kruger zone 3 (Bessel)',$,$,$,$,$);



IfcCoordinateReferenceSystem

Name: Name by which the coordinate reference system is identified.NOTE The name shall be taken from the list recognized bythe European Petroleum Survey Group EPSG. It should then bequalified by the EPSG name space, for example as 'EPSG:5555'.

Description: Informal description of this coordinate reference system.GeodeticDatum: Name by which this datum is identified. The geodetic datum is

associated with the coordinate reference system and indicates theshape and size of the rotation ellipsoid and this ellipsoid's connection and orientation to the actual globe/earth. It needs to be provided, if theName identifier does not unambiguously define the geodetic datum as well.Examples for geodetic datum include:- ED50- EUREF89- WSG84

VerticalDatum: Name by which the vertical datum is identified. The vertical datum is associated with the height axis of the coordinate reference system and indicates the reference plane and fundamental point defining the origin of a height system. It needs to be provided, if the Name identifier does notunambiguously define the vertical datum as well and if the coordinate referencesystem is a 3D reference system.Examples for vertical datum include:- DHHN92 the German 'Haupthöhennetz'- EVRS2007 the European Vertical Reference System



IfcMapConversionENTITY IfcCoordinateOperation

ABSTRACT SUPERTYPE OF(IfcMapConversion);SourceCRS : IfcCoordinateReferenceSystemSelect;TargetCRS : IfcCoordinateReferenceSystem;

END_ENTITY;

ENTITY IfcMapConversionSUBTYPE OF (IfcCoordinateOperation);

Eastings : IfcLengthMeasure;Northings : IfcLengthMeasure;OrthogonalHeight : IfcLengthMeasure;XAxisAbscissa : OPTIONAL IfcReal;XAxisOrdinate : OPTIONAL IfcReal;Scale : OPTIONAL IfcReal;

END_ENTITY;

Examples:10= IFCMAPCONVERSION(ref1,ref2,458658.,5438232.,113.7,0.270600445976,0.962691746426,$);11= IFCMAPCONVERSION(ref1,ref2, 458718.,5439970.,113.7,0.270600445976,0.962691746426,$);

ref1 – reference to the IfcGeometricRepresentationContext (not using cascading mapping of another IfcProjectedCRS)ref2 – reference to the IfcProjectedCRS (only subtype of ABS IfcCoordinateReferenceSystem)



IfcMapConversion

Easting: Specifies the location along the easting of the coordinate system of the target map coordinate reference system.NOTE for right-handed Cartesian coordinate systems this would establish the location along the x axis.

Northing: Specifies the location along the northing of the coordinate system of the target map coordinate reference system.NOTE for right-handed Cartesian coordinate systems this would establish the location along the y axis

OrthogonalHeight: Orthogonal height relative to the vertical datum specified.NOTE for right-handed Cartesian coordinate systems this would establish the location along the z axis

XAxisAbscissa: Specifies the value along the easing axis of the end point of a vector indicating theposition of the local x axis of the engineering coordinate reference system.NOTE 1 for right-handed Cartesian coordinate systems this would establish the location along the x axis (also referred to as the Easting in map coordinate systems) NOTE 2 together with the XAxisOrdinate it provides the direction of the local x axis within the horizontal plane of the map coordinate system

XAxisOrdinate: Specifies the value along the northing axis of the end point of a vector indicating the position of the local x axis of the engineering coordinate reference system. NOTE 1 for right-handed Cartesian coordinate systems this would establish the location along the y axis (also referred to as the Nothing in map coordinate systems) NOTE 2 together with the XAxisAbscissa it provides the direction of the local x axis within the horizontal plane of the map coordinate system.

Scale: Scale to be used, when the units of the CRS are not identical to the units of the engineering coordinate system. If omitted, the value of 1.0 is assumed.



Examples for CRS Identifiers

OGC Example:urn:ogc:def:crs,crs:EPSG::25832,crs:EPSG::5783urn:ogc:def:crs,crs:EPSG::5555

ADV Example (German National Working Group):urn:adv:crs:ETRS89_UTM32*DE_DHHN92_NH

IFC Example:EPSG::25832EPSG::25832,EPSG::5783EPSG::5555

NOTE The IFC syntax above is proposed if not already a CRS identifier is given



Orientation Example

Andreas Geiger, Karl-Heinz Häfele, Nick Nisbet19.08.2014

IfcGeometricRepresentationContextIfcMapConversionXAxisAbscisa [0.270600445976] XAxisOrdinate [0.962691746426]

TrueNorth [0.962691746426, 0.270600445976]

IfcMapConversionuses the angle between the global east direction and the local x-axis

IfcGeometricRepresentationContextuses the angle between the local y-axis and the global north direction


IFC Snippet

#1= IFCPROJECT('0xScRe4drECQ4DMSqUjd6d',#110,‘geo-referencing',$,$,$,$,(#43),#2);#2= IFCUNITASSIGNMENT((#3));#3= IFCSIUNIT(*,.LENGTHUNIT.,$,.METRE.);

#20= IFCPROJECTEDCRS('EPSG:25832','UTM in band 32','ETRS89',$,'UTM','UTM32',#3);#21= IFCMAPCONVERSION(#43,#20,458658.78,5438232.79,113.7,0.270600445976,0.962691746426,$);

#34= IFCDIRECTION((1.,0.,0.));#36= IFCDIRECTION((0.,0.,1.));#38= IFCCARTESIANPOINT((0.,0.,0.));#40= IFCAXIS2PLACEMENT3D(#38,#36,#34);#41= IFCDIRECTION((0.962691746426,0.270600445976));#43= IFCGEOMETRICREPRESENTATIONCONTEXT($,'Model',3,1.00000000000E-5,#40,#41);


Progress report on a review of IFG - ISO... · Progress report on a review of IFG DIBK AEC3...

Documents

Transcript of Progress report on a review of IFG - ISO... · Progress report on a review of IFG DIBK AEC3...