City model data

Object types

Espoo’s city information model covers all object types contained and defined in the CityGML standard with the exception of engineering structures (bridges and tunnels).

In addition to the basic objects of the standard (represented in blue), the standard allows Espoo’s city information model to include generic objects. Espoo mainly uses generic objects to visualise underground infrastructure (represented in white, Gen:*).

Data examples and object types.

Levels of detail

The object types of the city information model can be rendered at different levels of detail (LoD) ranging from 0 to 3.

Object attributes

The objects of the city model also have a significant number of attributes not covered by the CityGML schema, represented as generic attributes. These generic attributes make it possible to represent objects much more specifically than the CityGML schema would otherwise allow.

Generic attributes significantly increase the potential uses of the data. If necessary, new generic attributes can be added, or the existing ones can be tailored to meet specific needs.

Briefly about the data

An example of a building rendered at different levels of detail (LoD0–LoD3).

The terrain intersection line of a building (TerrainIntersection) is rendered according to the selected level of detail.

The interface will render a building at the requested level of detail. If the requested level is not available, the building will be rendered at the highest level available.**

Due to the technical solution used for building modelling, some buildings available at LoD3 are not available at LoD2, and a solid is missing from some buildings at LoD3.**

**As 3D modelling of buildings is still underway, not all buildings can be rendered at LoD2 and LoD3

Textures

Buildings can be supplemented with wall and roof-specific textures (Appearance) as https links.

The relief model is based on a topographic model generated in 2021 with laser scanning. The grids used in Espoo’s city model are also derived from the topographic model, enabling the creation of efficient and well-functioning city model.

To ensure efficient usability, the interface service renders the relief as a grid. The sizes of the grid’s sections depend on the level of detail.

Levels of detail

	LOD 0	LOD 1	LOD 2	LOD 3
RELIEF MODEL GRID SIZE (m)	Plane 10*10	100*100	25*25	10*10

LOD 0

LOD 1

LOD 2

LOD 3

RELIEF MODEL

GRID SIZE (m)

Plane 10*10

100*100

25*25

10*10

The high levels of detail are also available, if necessary. However, this may not be a suitable solution for rendering extensive areas due to the high quantity of data. Further information on the subject at Data request service.

The city information model is maintained through efficient and controlled processes in the city’s technical services. This enables the management of information produced and needed by decision-makers, planners and builders as part of the city information model.

City model maintenance processes, case: Building

Geometric and visual maintenance is connected to the traditional base map and infrastructure property maintenance. The latter two serve as sources of traditional spatial data and map data, and also data for the city information model.

3D city model of Espoo is maintained in Trimble Locus.

Publication of object types at different levels of detail and their descriptions

Detailed information about the Espoo's CityGML data.

Accessibility statement (in Finnish).

Related topics

Object types

Levels of detail

Object attributes

Briefly about the data

Buildings

Relief

Areal objects

Pipes and wells

Maintenance

Publication of object types at different levels of detail and their descriptions