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Copyright of Revue d'Économie Régionale & urbaine is the property of Librairie Armand Colin and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The 'vertical city' invite to consider new solutions to reach urban compactness. While architects and planners often approach the vertical city by its heights, we question the conditions of habitability of the underground city. If we admit that urban verticality can be thought of in its depths, we must still be able to apprehend it. In this article, cartography is considered as a necessity and a prerequisite for the integrated planning of the underground city. We first propose a state of the art of the existing maps of the urban underground. Then, we test alternative mapping approaches based on the user's experience. Finally, we consider how planning could integrate underground spaces into planning practices. [ABSTRACT FROM AUTHOR]