technology platform - requirements on data

i-SCOPE - interoperable Smart City services through an Open Platform for urban Ecosystems

Presented by: Leo MenzingerM.O.S.S.

interoperable Smart City services through an Open Platform for urban Ecosystems

Technology Platform - Requirements on data


Outline

• Overview technology platform• Generation of 3D CityGML model• Upload data• Data requirements• Supported file formats• Upload / download


Technology Platform - schematic overview

3D CityDatabase

CityGML

Google SketchUp

novaFACTORY novaFACTORY

3D CityDB

Imp/Exp

CityGMLCityGML

KML, VRML

SKP

DXF

3D-Shape

3D-PDF

…

SKP

CityGML

DSMDTM Floor plan

3D Technology Platform

OSM

Import Export


Initial load into 3D City database

novaFACTORY Import

3D CityDB

Import

3D CityDatabase

CityGML+

CityGML



Generate CityGML model

CityGML

novaFACTORY

Building GeneratorCityGML

DSMDTM Floor plan OSM



Upload DTM, DSM, floor plan

Reference system• Free / all common systems supported

(EPSG-Code is needed)

Preprocessing possible• All files should have the same reference system

Tiling (recommended)• Number of buildings < 5000• Buildings are related unambiguously to tile • Polygon (e.g. district) or rectangle

(e.g. 1*1 km² or 2*2 km²) • Identical tiles for all data sources• Simplified postprocessing

ObjectID• Unique objectID (over all object classes)

tiling


Model generation – data requirements

Building generation• min. 1 dots / m²• good results 4 dots / m²

Roof detection• 6 dots / roof area

gabled roof: 12 dots

hipped roof: 24 dots


Model generation – triangulation

Triangulation• External CityGML

- Triangled areas supported

Recommended for further processing andvisualisation

novaFACTORY – building generator• Base area

- Built from lowest point (with/without triangulation)

recommended (less number of triangles)- Built from DTM (with triangulation)

• Performance depending on number of triangles• Triangulation can also be generated afterwards


Model generation – file format

File formats• XML CityGML Version 1.0 gml• FEATURE Vector shp• DSM Elevation data (Text XYZ) dat• DTM Elevation data (Text XYZ) dat

FilesizeDepending on data and format

Filesize < 1 GB recommended

200 MB (XML) <-> 3 MB (binary)

PerformanceBuilding generator: 5000 buildings -> 30 min


Upload / download

Limitation (recommended)• Filesize < 1 GB• Number of objects - 5000 (visual checking)

Performance upload• Depending on filesize / number of objects• Reference system (transformation)• Bandwidth

Performance download• Depending on filesize / number of objects• Bandwidth


Thank you for your attention

Contact details

Leo MenzingerM.O.S.S. - [email protected]