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Our study demonstrates that 3D city models are employed in at least 29 use cases that are a part of more than 100 applications.The classified inventory could be useful for scientists as well as stakeholders in the geospatial industry, such as companies and national mapping agencies, as it may serve as a reference document to better position their operations, design product portfolios, and to better understand the market.
In a 2000 study, Batty  provide a conceptual study on the use of 3D city models, focused on visualisation and spatial planning.
To date, 3D City Models have been confined to well defined city boundaries, and as yet have not been considered in a multi-city integrated manner, at country scale and beyond as would be the case for 2D spatial information.
However, increasingly National Mapping and Cadastral Agencies (responsible for generating country-wide mapping) are investigating the possibility, financial feasibility and utility of making such datasets available over a broader area.
A 3D city model is a representation of an urban environment with a three-dimensional geometry of common urban objects and structures, with buildings as the most prominent feature [1,2,3,4].
A typical 3D city model is derived from various acquisition techniques, for instance, photogrammetry and laser scanning [5,6,7,8], extrusion from 2D footprints [9,10], synthetic aperture radar [11,12,13,14,15], architectural models and drawings [16,17,18], handheld devices [19,20], procedural modelling [21,22,23,24,25,26], and volunteered geoinformation [27,28,29].