Simple 3D Buildings

From OpenStreetMap Wiki
(Redirected from Key:roof:angle)
Jump to navigation Jump to search

This page describes tags for basic 3D attributes of buildings.

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). Gaps between polygons are illustrative only, in reality their sides match precisely.

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[1].

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 should be filled with building:part=* areas, tagged with their respective height and other attributes. These areas may overlap each other or may be disjunct, depending on the building. That said, 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 areas tagged with building:part=*.

Areas 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.[2]

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 Role part. The building outline must be listed with the role 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 shape

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

Image Roof Gabled.png Roof Flat.png Roof Hipped.png Roof Pyramidal.png Roof Skillion.png Roof Half Hipped.png Roof Hip and Gable.png Roof Butterfly.png
roof:shape gabled flat hipped pyramidal skillion half-hipped hipped-and-gabled butterfly
Image Roof Round.png Roof Gambrel.png Roof Mansard.png Roof Dome.png Roof Onion.png Roof Sawtooth.png
roof:shape round gambrel mansard dome onion sawtooth
Image Roof Cone.png Roof Crosspitched.png Roof Side Hipped.png Roof Side Half Hipped.png Roof Gabled Height Moved.png
roof:shape cone crosspitched side_hipped side_half-hipped gabled_height_moved
Other common values
Value Comment
many Marks that building has multiple different roof shapes at once. Such building may have building:part=* carrying own roof:shape values. History described in detail in roof:shape=many

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.
roof:material=* The outermost material of the roof. Useful in conjunction with roof:colour=*.
roof:colour=* The (dominant) colour of the roof. Useful in conjunction with roof:material=*.

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 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 browser-based 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, discontinued July 2020

Map applications

Application name Platform Schema support License Notes
Streets GL Web yes MIT
OSM2World Windows, Linux, Macintosh partial LGPL Currently implementing the remaining features for the 0.2.0 release - slippymap (Germany only)
OSMBuildings Web partial BSD
F4 Map Web yes Proprietary Demo Web Map with rendering and scene support
OSM go Web partial GPL Only pyramidal and dome (yet, flat is default)
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
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. Web partial Currently offline unless you have an older Java version (≤1.6). New WebGL version in development.
OSG-Maps Android partial Proprietary Mapnik stylesheet Web partial Most roof types implemented in 2.5D view.
WikiMiniAtlas Web partial GPL Only pyramidal roofs.
VR Map Web partial MPL Heights and colors only.
Cesium OSM Buildings Web Updated monthly.

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 ? 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.


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

An image can help to understand some architectural terms.

Related Proposals

  • F3DB (Abandoned Full 3D buildings proposal)

See also

  • windows=* - Describes whether a building(part) has windows.


  1. This doesn't apply to F4 Map, see: Non-building:part parts of buildings are not rendered #3, Streets GL GitHub, StrandedKitty comment, 3 May 2023