> The map itself is an abstraction > What about thermal and hypogenic caves? > There is no sense for in this discussion.
We use map as model of cavity shape. Using model we do a measurements on model. Using correspondence between model and reality we make conclusions. It is the scientific approach. Thats it. Cave genesis is not point here, selecting projection of map is the process of selecting more appropriate cavity shape model. Most adequate model is 3d, but for some sort of caves - 2d is enough adequate.
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