Stranger in a Srange Land;Exploring 3D and CityGML

Stranger in a Strange LandExploring 3D and CityGML

Guido SteinGIS AnalystApplied Geographics, Inc.

Guido Like Burrito

Guido SteinGIS AnalystCommunity OrganizerDog Person

Agenda●From 2D to 3D: The Case

for CityGML ●NYC DOITT Planimetric

Update: QC for 3D with FME

From Planimetric Data

To 3D Models

To CityGMLCityGML is an open data model and XML-based format for the storage and exchange of virtual 3D city models. It is an application schema for the Geography Markup Language version 3.1.1 (GML3), the extendible international standard for spatial data exchange issued by the Open Geospatial Consortium (OGC) and the ISO TC211. The aim of the development of CityGML is to reach a common definition of the basic entities, attributes, and relations of a 3D city model. This is especially important with respect to the cost-effective sustainable maintenance of 3D city models, allowing the reuse of the same data in different application fields.

Source: http://www.opengeospatial.org/standards/citygml

Why CityGML?

Source: http://goo.gl/nY93AN (download.oracle.com)

Standards Make Things Clearer, Right?

Source: http://schemas.opengis.net/citygml

Construct 3D Buildings using CityGML StandardsCity of New YorkDepartment of Information Technology and Telecommunications (DoITT) GIS

Quality Control: The Big PictureValid XML

TestSurface Orientation Test

Component Test

Solid Object Test

Conflation and Position Test

Valid XMLTest

Does this xml file follow the xsd standards?

Are features being created as buildings with parts?

Source: http://goo.gl/fSbfxa (en.wiki.quality.sig3d.org)

CityGML Example

CityGML Schema

SurfaceOrientation

Test

Is this surface pointing into the building?

Is this floor pointing up?

Is this roof pointing down?

Source: http://goo.gl/fSbfxa (en.wiki.quality.sig3d.org)

CityGML Definition

3D Orientation Example

Component Test

Does each building have roof, wall, and ground surface?

Source: http://goo.gl/fSbfxa (en.wiki.quality.sig3d.org)

Component Example

Solid ObjectTest

Are all the features associated with a building ID part of a solid 3d feature?

Unintentional Gap

Unintentional Gap

3D Formats● AutoDesk 3DS● MicroStation DGN● Sketchup KMZ● Collada● MultiPatch● Shapefile Z

Alternate Viewers● FZK Viewer● MeshLab

Conflation & Position

Test

Do the 3D buildings’ ground surface match the location of the planimetric footprints?

Have IDs from planimetric data been properly conflated to the 3D buildings?

Positional Alignment vs Elevation

Intentional vertical offset to show alignment

ResourcesCityGMLcitygml.orgopengeospatial.orgcitygmlwiki.org

FMEknowledge.safe.com

BIM TutorialIFC to CityGML

(I, II, II)

Many Thanks

NYC DOITT GIS FME SUPPORT CityGML Wiki

Thank you!Guido SteinGIS AnalystApplied Geographics, Inc.

gstein@appgeo.com@guidos

FOSS4G Boston 2017

We need and want your attendance,

support and sponsorship!August, 2017

http://2017.foss4g.org