oq-gem

Glossary for gem taxonomy

Authors: Luke Allen, Andrew Charleson, Svetlana Brzev, and Charles Scawthorn

This online Glossary explains around 400 terms contained in the GEM Building Taxonomy v 2.0 and nearly 700 images.

The terms have been listed in alphabetical and numerical order. Text description of each term is accompanied by illustrations (photos and/or drawings) where possible.

We welcome contributions in the form of photographs or images, illustrating glossary terms. If you have any questions you can also contact us at buildingtaxonomy@globalquakemodel.org


Shape of the building plan (often referred to as "footprint") is the shape of the projection of the exterior edge of the building at grade onto the horizontal plane. To the extent possible, it is classified according to various simple shapes and letters of the alphabet. The shape from the table that most closely resembles the shape of the building footprint should be listed.

Where the building changes in plan cross-section (such as in the case of tower and podium, or a setback) some judgment is called for – in general, the shape that the building conforms to for the majority of its height should be listed, and may differ from the footprint (plan cross-section) at ground floor level.