Simple 3D buildings

This page describes tags for basic 3D attributes of buildings. For a proposal for advanced 3D tagging see F3DB.

The following tagging methods are results of the 2nd 3D Workshop Garching, where most 3D developers agreed on supporting a unified subset of tags in their programs. Basically, we describe the volume of a building using two types of areas: 1) building outlines for the most general area of a complex building and 2) building parts to describe sections of the building, especially those with different height or other attributes.

How to Map

Building outlines

Two building:part areas (green) within a building area (red)

The building outline represents the area of land covered by the union of all parts of the building. The outline may in most cases also be considered the building footprint. This is a closed way or multipolygon tagged with building=*.

Building attributes (e.g., address, name, overall height, operator, etc.) must be tagged on the building outline.

The building outline provides backward compatibility for 2D rendering software, such as Mapnik, and other data consumers not interested in 3D modeling. When a building has any building:part=* areas, the building outline is not considered for 3D rendering.

Building parts

Parts of a building that have differing physical characteristics (height, color, etc) are usually modeled by drawing an area within the building outline tagged with the building:part=* tag. The value of the building:part=* tag is usually yes, but it can be any building=* value.

The entire building outline is filled with building:part=* ways, tagged with their respective height and other attributes. These areas may overlap each other or may be disjunct, depending on the building. (But while 2D footprints can and often need to overlap, avoid overlapping 3D volumes – especially if the volumes have common faces.)

See the following section for building attribute tags typically applied to ways tagged with building:part=*.

Ways tagged with building:part=* are mainly considered for 3D rendering. 2D renderers ignore the building attribute tags described in the following section.

Tip: Overlapping shapes like this can be tricky to select. In JOSM, click while holding down 'Alt' key to cycle through overlapping objects and make the selection you want. (from https://blog.mapbox.com)

Building relations

If at least one part of a building is hanging over the building footprint or if the building has a complex structure with lots of parts, a type=building relation can be used to group the building outline and all building parts together. Otherwise, there is no need to create a type=building relation, i.e. simply position all building parts inside the building outline as described above.

If the type=building relation is present for a building, all building parts must be listed as the relation members with the role part. The building outline must be listed with the role outline. The building parts can be located in any possible way (inside, outside, intersecting, touching) relative to the building outline in the presence of the type=building relation.

If there is no type=building relation, an application should treat all building parts within the area of the building outline as part of that building.

Tagging for building outlines and parts

The following tags can be used on both building outlines and building parts.

Height and levels

schematic example of level and height tagging

Key	Comment
height=*	Distance between the lowest possible position with ground contact and the top of the roof of the building, excluding antennas, spires and other equipment mounted on the roof.
min_height=*	Approximate height below the building structure. Note that when min_height is used, height is still defined as the distance from the ground to the top of the structure. So "bridge" with 3 meters height, where bottom part of the bridge is positioned 10 meters above ground level will have min_height=10, height=13.
building:levels=*	Number of floors of the building above ground (without levels in the roof), to be able to texture the building in a nice way. If you tag new buildings, try to give a height value. Try to use building:levels=* only in addition to a height tag!
building:min_level=*	Levels skipped in a building part, analogous to min_height

Roof

Roof shape

You can characterize the roof of a building using a catalogue of well-known roof types.

Image
roof:shape	flat	skillion	gabled	half-hipped	hipped	pyramidal

Image
roof:shape	gambrel	mansard	dome	onion	round	saltbox

Other roof tags

Key	Comment
roof:orientation=along/across	For roofs with a ridge the ridge is assumed to be parallel to the longest side of the building (roof:orientation=along). But it can be tagged explicitly with this tag.
roof:height=*	The height of the building (i.e. the height of the façade) is calculated as the building's total height=* minus roof:height=*.
roof:angle=*	Alternatively to roof:height=*, roof height can be indicated implicitly by providing the inclination of the sides (in degrees).
roof:levels=*	Number of floors within the roof, which are not already counted in building:levels=*.
roof:direction=*	Direction from back side of roof to front, i.e. the direction towards which the main face of the roof is looking

Proposed tags

Some roofs (e.g., square buildings) cannot be accurately modeled with the simple techniques described on this page.

Additional roof shapes are suggested in S3DB_Proposals, including advanced approaches for manual modelling (e.g., ProposedRoofLines or parts of OSM-4D/Roof_table).

This section is a wiki template, editable here.

Surface color and material

Key	Comment
building:colour=*	Colour of the building façade. See colour=* for possible values.
roof:colour=*	Colour of the building roof. See colour=* for possible values.
building:material=*	Outer material for the building façade.
roof:material=*	Outer material for the building roof.

3D Examples

To view numerous 3D buildings on a large scale, see examples here: 3D Demo Areas

To view individual 3D buildings, see examples here: 3D Building Examples

Software support

Main article: 3D development

Many maps and tools support the simple 3D buildings schema. Among the first were the OSM-3D.org renderer in 2009, the OSM2World renderer and Kendzi3D JOSM plugin in 2011, and the Nutiteq Android 3D Mapping SDK (now Carto Mobile SDK) and WikiMiniAtlas in 2012. OSMBuildings launched a 2.5D display in 2012, followed by a 3D version in 2015. In 2013, F4 Map became the first renderer to fully support the simple 3D buildings schema.

Editing tools

Software name	Platform	Schema support	License	Notes
Kendzi3d	Windows, macOS, Linux	yes	BSD	JOSM plugin
SketchOSM	Windows	partial	Proprietary	SketchUp plugin in beta

Map applications

Application name	Platform	Schema support	License	Notes
CartoType Maps App	Windows, Linux, Macintosh	partial	Proprietary but unrestricted use	A free demonstration application for the proprietary CartoType library. The CartoType GL version implements most roof shapes. Includes a style sheet editor.
F4 Map	Web	yes	Proprietary	Demo Web Map with rendering and scene support
Mapbox Static API	Web	partial	BSD	Requires a free Mapbox Studio account.
OpenScienceMap	Web	partial	LGPL	Interprets only height/min_height tags client-side. The S3DB Layer uses vtm meshes generated on the server (using plpgsql with PostGIS and SFCGAL). Web map
OSG-Maps	Android	partial	Proprietary
OSM2World	Web	partial	LGPL	Currently implementing the remaining features for the 0.2.0 release - slippymap (Germany only)
OSM-3D.org	Web	partial		see OSM-3D#Buildings
osmapa.pl Mapnik stylesheet	Web	partial		most roof types implemented in 2.5D view
OSMBuildings	Web	partial	BSD
OSM go	Web	partial	GPL	Only pyramidal and dome (yet, flat is default)
WikiMiniAtlas	Web	partial	GPL	only pyramidal roofs

Map frameworks

Main article: Frameworks

Software name	Platform	Language	Schema support	License	Notes
Carto Mobile SDK	Android, iOS, Windows Phone	Java, Objective-C++, Swift, C#	partial	BSD	most roof shapes supported; see Carto's documentation
CartoType for Android	Android	Java	partial	Proprietary	Most roof shapes supported.Styles can be controlled using CartoType's XML style sheets. Uses OpenGL ES graphics acceleration. Viewing angle, height, field of view, etc., can be modified.
CartoType for iOS	iOS	Objective C, Swift
CartoType for C++	Windows, Linux, OS X (Macintosh)	C++
CartoType for .NET	Windows	C#, VB.NET and other .NET languages
CartoType for Qt	Qt on Windows, Mac (OS X) and Linux	C++
Mapbox GL JS	Web	JavaScript	partial	BSD	Options for customizing 3D building display are included in the Mapbox Style Specification. (See Mapbox's blog post announcing GL JS support.)
Mapbox Android SDK	Android	Java
Mapbox iOS SDK	iOS	Objective-C, Swift, Interface Builder
Mapbox macOS SDK	macOS	Objective-C, Swift, Interface Builder, AppleScript
Mapbox Qt SDK	Qt	C++, QML
Mapbox Unity SDK	Cross-platform	C#		Apache
node-mapbox-gl-native	Node.js	JavaScript		BSD
osm2x3d	Web		partial	Unknown	see also [1] and [2]
OSMBuildings	Web	JavaScript	partial	BSD	2.5D and 3D versions available
Tangram	Web	JavaScript	partial	MIT	Mapzen renders 3D buildings in Tangram and other products
Tangram ES	Android, iOS, Linux, macOS	C++
VTM	Android, iOS, Web	Java	partial	LGPL	Part of the mapsforge project.

Design tools

Software name	Platform	Schema support	License	Description
blender-osm	Windows, macOS, Linux	partial	GPL	One click download and import of OpenStreetMap and terrain. Can import more than 100,000 buildings. A large number of roof shapes is supported: flat, gabled, hipped (for a quadrangle outline only), mono-pitched, half-hipped, round, pyramidal, gambrel, dome, onion and saltbox.
Mapbox Studio	Web	partial	Proprietary	Includes a Mapbox GL style editor that supports building (part) heights.
Maputnik	Web	partial	MIT	A Mapbox GL style editor that supports building (part) heights.
Tangram Play	Web	partial	MIT	A Tangram scene editor that supports extruded buildings with heights based on OSM data.

Terminology

Diagram of the main architectural elements that make up a pitched roof

An image can help to understand some architectural terms.

Related Proposals

• F3DB (Full 3D buildings)