3D City Models have evolved to be important tools for urban decision processes and information systems, especially in planning,
simulation, analysis, documentation and heritage management. On the other hand existing and in use numerical cartography is often
not suitable to be used in GIS because not geometrically and topologically correctly structured.
The research aim is to 3D structure and organize a numeric cartography for GIS and turn it into CityGML standardized features.
The work is framed around a first phase of methodological analysis aimed to underline which existing standard (like ISO and OGC
rules) can be used to improve the quality requirement of a cartographic structure. Subsequently, from this technical specifics, it has
been investigated the translation in formal contents, using an owner interchange software (SketchUp), to support some guide lines
implementations to generate a GIS3D structured in GML3.
It has been therefore predisposed a test three-dimensional numerical cartography (scale 1:500, generated from range data captured by
3D laser scanner), tested on its quality according to the previous standard and edited when and where necessary. Cad files and shapefiles
are converted into a final 3D model (Google SketchUp model) and then exported into a 3D city model (CityGML LoD1/LoD2).
The GIS3D structure has been managed in a GIS environment to run further spatial analysis and energy performance estimate, not
achievable in a 2D environment. In particular geometrical building parameters (footprint, volume etc.) are computed and building
envelop thermal characteristics are derived from. Lastly, a simulation is carried out to deal with asbestos and home renovating charges
and show how the built 3D city model can support municipal managers with risk diagnosis of the present situation and development
of strategies for a sustainable redevelop.