2.2 Methodologies and Instruments
Data are initially built and edited in the Autocad environment.
The choice of using this software, born with the native format of
the source data (mostly CAD files and shapefiles), is supported
by its powerful editing tools, as well as its 3D visualization
capabilities. For modelling the city buildings and other generic
objects, Google Sketchup (Google Inc. 2010b) including
citygml.de Sketchup Plug-In (CityGML-Toolchain 2010) is used.