3D city models are becoming integral foundations for building and planning cities around the globe. The digital base underlying these models enables cities to become smarter and more intelligent. This supports urban planning, architecture, transportation, utilities, aviation, roads / highways and types of infrastructure investment. Beyond the basic 3D visual experience of these models, 2D static images can be created for use and 4D can also be supported through integration to enable change over time applications. IN practice, several kinds of technologies and data types are used to build 3D city models.
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