Glossary

Application Domain Extension (ADE)

Anweisung Straßeninformationsbank (ASB)

Semantic decomposition of the CityGML class TransportationComplex (LoD2-4) for objects not directly used for vehicle or pedestrian movement, e.g. curbs or green areas. Geometry: MultiSurface

Database Management System

Department of City Planning (DCP)

Department of Information Technology & Telecommunications (DoITT)

Department of Transportation (DOT)

Geometric complexes (i.e. instances of gml:GeometricComplexType) are closed collections of geometric primitives, i.e. they will contain their boundaries.

A geometric complex (gml:GeometricComplex) is defined by ISO 19107:2003, 6.6.1 as "a set of primitive geometric objects (in a common coordinate system) whose interiors are disjoint. Further, if a primitive is in a geometric complex, then there exists a set of primitives in that complex whose point-wise union is the boundary of this first primitive."

LoD0Networks used to model streets in LoD0 use the geometry type GeometricComplex.

Geo Database (GDB)

Geographic Data Files (GDF)

Geo Information System (GIS)

GL Transmission Format (glTF) is an efficient, interoperable asset delivery format that compresses the size of 3D scenes and models, and minimizes runtime processing by applications using WebGL and other APIs.

Geography Markup Language

Joint Photographic Experts Group (JPEG)

All medians that physically divide a roadbed were collected; which includes medians, traffic islands, "Jersey Barriers", and painted areas that are used to separate traffic flow. Source data for 'Dividing Strips', 'Road Marking' and ' Grass areas'.

A gml:MultiSurface is defined by one or more gml:AbstractSurfaces. There are no restrictions concerning the structure of these surfaces. For example these surfaces can overlap or intersect each other.

All parking lots (paved or unpaved) greater than 2,000 sq. feet (~186 sq. meter). Parking areas adjacent to the travel-way and separated from the travel-way by a curb or other obstruction were captured as parking lots.

Plazas are hard surfaced "parks" adjacent to public sidewalks or pavement edges.

The shapefile format is a popular geospatial vector data format for geographic information system (GIS) software. It is developed and regulated by Esri as an open specification for data interoperability among Esri and other GIS software products.The shapefile format can spatially describe vector features: points, lines, and polygons. Each item usually has attributes that describe it, such as name or temperature.

A Square is an open area commonly found in cities (e.g. a plaza, market square). It is a subclass of TransportationComplex and thus inherits all its attributes and relations.

A virtual globe is a three-dimensional (3D) software model or representation of the Earth or another world. (e.g. GoogleEarth, Cesium)

Extract, Transform, Load

Keyhole Markup Language (KML) is an XML notation for expressing geographic annotation and visualization within Internet-based, two-dimensional maps and three-dimensional Earth browsers. KML became an international standard of the Open Geospatial Consortium in 2008. Google Earth was the first program able to view and graphically edit KML files.

New York City Open Data Portal (NYCODP)

A Track is a small path mainly used by pedestrians. It is a subclass of TransportationComplex and thus inherits all its attributes and relations.

Semantic decomposition of the CityGML class TransportationComplex (LoD2-4) for objects used for vehicle or pedestrian movement (e.g. diving lanes or foot paths). Geometry: MultiSurface

This type and element describe transportation complexes like roads or railways which may be aggregated from different thematic components (traffic areas, e.g. pedestrian path, and auxiliary traffic areas). As a subclass of _CityObject, TransportationComplex inherits all attributes and relations, in particular an id, names, external references, and generalisation relations. Furthermore, it represents the superclass for thematically distinct types of transportation complexes.

The transportation model of CityGML is a multi-functional, multi-scale model focusing on thematic and func-tional as well as on geometrical/topological aspects. Transportation features are represented as a linear network in LOD0. Starting from LOD1, all transportation features are geometrically described by 3D surfaces. The areal modelling of transportation features allows for the application of geometric route planning algorithms. This can be useful to determine restrictions and manoeuvres required along a transportation route. This information can also be employed for trajectory planning of mobile robots in the real world or the automatic placement of avatars (virtual people) or vehicle models in 3D visualisations and training simulators. The transportation model of CityGML is provided by the thematic extension module Transportation (cf. chapter 7).

_TransportationObject represents the abstract superclass for transportation objects. Future extensions of the CityGML transportation model shall be modelled as subclasses of this class.

City Geography Markup Language (CityGML) is a conceptual data model and exchange format for semantic 3D city models. It is an open international standard issued by the OGC. [read further]

Virtual 3D city models are a spatial representation of the relevant entities within cities. 3D city models have traditionally been used for many application areas like urban planning, navigation, tourism, disaster management, training simulation and gaming.

The attributes class, function, and usage of the features TransportationComplex, TrafficArea and AuxiliaryTrafficArea as well as the attribute surfaceMaterial of the features TrafficArea and AuxiliaryTrafficArea are specified as gml:CodeType. The values of these properties can be enumerated in code lists.

COLLAborative Design Activity defines a database schema and XML encoding for the exchange of 3D assets between applications like 3D authoring and processing tools as well as 3D visualization software. COLLADA is an international standard issued by the Khronos Group. [https://www.khronos.org/collada/]

Coordinate Reference System

All curbs between roadbed pavement and other surfaces (i.e., within the street right-of-way) were captured.

Feature Manipulation Engine (FME)

Identification

International Standards Organisation (ISO) is an international-standard-setting body composed of representatives from various national standards organizations. [http://www.iso.org]

Linear Integrated Ordered Network

Level of Detail

Open Geospatial Consortium (OGC) is an International standards organization for geospatial information systems. [http://www.opengeospatial.org/]

Objektkatalog für das Straßen- und Verkehrswesen (OKSTRA)

Road is intended to be used to represent transportation features that are mainly used by vehicles like cars, for example streets, motorways, and country roads. It is a subclass of TransportationComplex and thus inherits all its attributes and relations.

Roadbed represents the interior polygon of the pavement edge.

Unified Modeling Language

A Universally Unique Identifier (UUID) is an identifier standard used in software construction, standardized by the Open Software Foundation (OSF) as part of the Distributed Computing Environment (DCE).

eXtensible Markup Language is a general-purpose specification for creating custom markup languages. It is an open standard issued by the World Wide Web Consortium (W3C).

The XML namespace of the CityGML Transportation module is identified by the Uniform Resource Identifier (URI) http://www.opengis.net/citygml/transportation/2.0. Within the XML Schema definition of the Transporta-tion module, this URI is also used to identify the default namespace.

Three Dimensional

3DCityDB is an Open Source geodatabase to store, manage, and visualize semantic 3D city models. [http://www.3dcitydb.org]

The 3DCityDB Web-Map-Client is a web based front-end for 3D visualization and interactive exploration of semantic 3D city models.