ISPRS-Archives The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences ISPRS-Archives Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci. 2194-9034 Copernicus Publications Göttingen, Germany 10.5194/isprs-archives-XLII-4-135-2018 MODELING CITIES FOR 3D_GIS PURPOSES de Jesus E. G. V. 1 de Amorim A. L. 2 Groetelaars N. J. 2 Fernandes V. O. 1 Dept. of Transport and Geodesy Engineering, Federal University of Bahia, Aristides Novis Street, 2, Federação, Salvador, Bahia, Brazil Architecture Faculty, Federal University of Bahia, Caetano Moura Street,121, Federação, Salvador, Bahia, Brazil 19 09 2018 XLII-4 135 142 Copyright: © 2018 E. G. V. de Jesus et al. 2018 This work is licensed under the Creative Commons Attribution 4.0 International License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/4.0/ This article is available from https://isprs-archives.copernicus.org/articles/XLII-4/135/2018/isprs-archives-XLII-4-135-2018.html The full text article is available as a PDF file from https://isprs-archives.copernicus.org/articles/XLII-4/135/2018/isprs-archives-XLII-4-135-2018.pdf

3D Geographic Information Systems (3D GIS) are systems that are capable of making spatial analyses that consider the tridimentional and semantic representation of objects. These systems make these analyses through its planialtimetric coordinates. The City Geography Markup Language (CityGML) is used for the representation of cities and urban applications. The CityGML is an international standardized data model based on XML used to store and exchange information through 3D representation of cities. This standardized data model has 5 Levels of Detail – LOD, varying from LOD 0 (least detailed) to 4 (most detailed). The main challenges for the implementation of these systems refer to the techniques used for obtaining data and the data format, and also all the software used in the geometric modeling of the urban model. The data related to the buildings were manipulated with the QGIS software in this study. This made it possible to obtain the height of the buildings by the elevation difference between the Digital Surface Model and the Digital Terrain Model. This paper presents and discusses the first results of the geometric modeling made in the campus of the Federal University of Bahia (UFBA), by using airborne laser scanning data, integrating QGIS, Rhinoceros and CityGML.