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National reference data · BD TOPO® · IGNGeospatial & territory

National reference data, in three dimensions

Extrude a building layer by its own height attribute and read the city as volume rather than as outlines.

DjiniousMapAgent GIS
DjiniousMap
The DjiniousMap studio showing BD TOPO Paris buildings extruded into a massing model under a pitched camera, looking across the Seine over Île de la Cité, Notre-Dame, the Quartier Latin and Les Halles, with a height histogram widget.
buildings in the extruded layer
606,667buildings in the extruded layerBD TOPO® · Paris
default exaggeration
1default exaggerationthe volume is the building’s own

BD TOPO ships building footprints with a measured height on every feature. Extruding by that column turns a polygon layer into a massing model — useful for anything where what matters is above ground: sightlines, solar exposure, shadow, or simply explaining a site to somebody who does not read plans.

The extrusion is part of the saved map document, so the view is versioned and shareable like any other. Exaggeration 1 is the default on purpose: scaling a measured height makes a nicer picture of something that is no longer true.

How it runs

  1. Materialize

    Extract the departmental BD TOPO layers and materialize them.

    Materialization

  2. Extrude

    Add the building layer and set “Extrude by” to its height column.

    3D extrusion

  3. Pitch the camera

    The layer renders as volume, cross-filtered like any other.

    Map studio

  4. Publish

    Publish the map version and share it.

    Versioned assets

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