The Sarajevo Canton Development Planning Institute, through the project "Updating the Basic Topographic Map 1:5,000 of Urban Areas of the Sarajevo Canton" - Phase 2: Collection of Data on the Height of Objects, created a 3D model of urban areas of the Sarajevo Canton. 3D objects of urban areas of the Sarajevo Canton are defined with their spatial position (base) and height. The 3D geometry of objects, for creating a 3D model of urban areas of the Sarajevo Canton, was obtained by raising the contour of the object to an absolute height and elongated by the height of the object, which results in an object of detail LoD1. In LoD1, the building model is represented in a block model of buildings. This geometry is placed in a spatial database (Microsoft SQL) with the attributes: absolute height of the bottom of the object, absolute height of the top of the object and relative height of the object. The geometry can be viewed in applications that support 3D (e.g. directly in ArcScene). Aerial photographs were used to obtain point clouds to determine the highest point of the object, and the DTM of the urban area of Sarajevo was used to determine the height of the object point on the ground. This representation of objects (LoD1) is sufficient for spatial analysis at the urban plan level (e.g. population density assessment, calculation of gross building area (BGP), simulation and modeling of ventilated urban corridors, creation of a smart digital city, etc.). To meet the demand for efficient visualization of 3D city models, the new Open Geospatial Consortium (OGC) created CityGML, which defines a 3D city model in five different levels of detail. CityGML is an open data model for storing and exchanging 3D city models. Using OGC standards for spatial data exchange, the Sarajevo Canton Development Planning Institute created WMS (Web Map Service): a 3D model of urban areas of the Sarajevo Canton.