An application of CIM Models in Urban design and Land management: the case of Lisbon city Authors: Sónia ILDEFONSO; Ana Paula FALCÃO; Helena RUA Country: Portugal Institution/ Company: Instituto Superior Técnico, Universidade de Lisboa 1. INTRODUCTION AND BACKGROUND City Information Models (CIM) combine the traditional capabilities of a Geographic Information Systems (GIS) with the capacities of a Building Information Model (BIM) allowing a qualitatively and quantitatively space description. In this communication, we highlight the importance of CIM models in land management, using procedural modelling techniques based on Computer generated architecture (CGA) shape grammar, by developing a methodology to automatically evaluate the municipality detailed plan fulfilment, such as the maximum building height allowed. The study case is Lisbon downtown, however the CIM model was built for a larger (3,670 x 2,300 m) area, comprising 11,602 buildings. The software used in the model construction and spatial analysis was CityEngine (CE), provided by ESRI-Portugal. 2. DATA DESCRIPTION AND METHODOLOGY The study case is Lisbon downtown (Figure 1) corresponding to an area that is protected by a heritage plan, namely Plano de Pormenor de Salvaguarda da Baixa Pombalina (PPSBP), that imposes restrictions on construction and occupation, such as the number of floors, the maximum building height and footprint area. The data available for this work was: orthophotomap at 1/1000 scale, contours and height points, building footprints and attributes such as the number of floors above ground and underground. The methodology followed in this work to build the CIM model was based on these steps: i) Combining height data to generate a digital elevation model, onto which the orthophotomap and building footprints were projected; ii) Generating the 3D buildings/blocks by applying basic authored shape rules (Andrade et al., 2012); iii) Enhancing the model by adding textures, constructive details and specifications. Different levels of detail – LOD (Chen, 2011) were considered: for the Lisbon downtown attributes such as the number of floors above and below the ground surface, the façades orientation, type and colour (LOD2 and 3); for the surrounding area only a volumetric representation was considered (LOD1). Figure 1 – Perspective from Lisbon CIM model section (grey colour) and downtown (yellow). In order to automatically analyse the fulfilment of the maximum building height set in the heritage protection plan, a new rule was produced to allow a visual inspection of the current situation (Fig. 2, yellow colour scenario for current situation and green colour scenario corresponding to the maximum height values, according PPSBP).