3D Model
Three-dimensional representations of buildings, cities, and terrain, and how their level of detail is defined. These articles help you specify what you need, so a model is neither too rough for its use nor more detailed than it has to be.
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Level of Detail in 3D City Models
Filip Biljecki goes into the details of how to describe the level of detail for city models. Make sure to read this phd theses to better define what you want (or need).