Questions on How to Create 1:1 Replicas of Real-Life Cities and Landscapes

@anonymous_user_86a50b4a I am also working on similar Project to create replica of city for generating synthetic data. Can you summarize the steps which you went through to create the city environment.
I am currently using houdini to do procedural modelling for generation of roads and building but somehow after importing into unreal engine it kind of limits the functionality of modifying the assets in Unreal Engine.
Could you tell a better way of automating this process where the project is more scalable and can be updated accordingly.
Your Help will be so beneficial…