Abstract
Abstract. 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.
Highlights
The Geographic Information Systems (GIS) have many urban applications and may be associated to 2D, 2.5D, 3D and 4D visualizations
The results presented consist of the performing of the geometric modeling of the buildings done in the QGIS and the Rhinoceros, from which its model was transformed to City Geography Markup Language (CityGML), as it is presented below
Many studies have been performed for the development of software programs that enable the integration of CAD-BIM/GIS data and allow the importation/exportation of data in the CityGML format
Summary
The Geographic Information Systems (GIS) have many urban applications and may be associated to 2D, 2.5D, 3D and 4D visualizations. In the geometric modeling of an urban space it is necessary to define the Level of Detail (LOD), which expresses the accuracy and reliability with which the elements must be represented and the element classes to be included (REDWEIK et al, 2007). In this context, there are differences in the use of the term LOD for GIS and in Computer Graphics. This paper presents the first results of the modeling of the Ondina campus – UFBA, performed from airborne laser scanning data This model is compatible with LOD 1, aiming to test and integrate the usage of the CAD and GIS tools and its compatibilities with the CityGML pattern.
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