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tudelft3d / bag3d

Software for generating a 3D version of the BAG dataset and more. Python + PostgreSQL + 3dfier
GNU General Public License v3.0
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Underground buildings #27

Closed ghost closed 3 years ago

ghost commented 5 years ago

I have found at least one issue regarding an underground building that has a 'positive' height. Maybe 'underground buildings' should have been filtered out of the BAG dataset before heights are calculated?

Example: Marktgarage, Delft : Willem Naghelstraat 1, 2612 XD Delft image

balazsdukai commented 5 years ago

@HarmenK I looked into this a bit. Do you know how to filter out such underground buildings?

ghost commented 5 years ago

Well, that depends on the BAG data you use. That's the first dataset I should look into: has a building an attribute where it says what it is or maybe if it is above the surface or is it subsurface? Otherwise, you can maybe determine it by a combination of a geographical and a statistical approach on buildings. For example, buildings crossing roads and having a lot of 'weird' or low height values (below 2 metres). Something like this maybe? I haven't done anything like that, these are some ideas. Love to hear how you solve it.

balazsdukai commented 5 years ago

Okay, I was hoping that you have a solution :-) . Neither in the BAG, nor in the BGT are there attributes that identify underground buildings. In theory the relatieveHoogteligging attribute in BGT could help, but in practice this is often not filled out or incorrect. As far as I know, Kadaster doesn't have a method for filtering out underground buildings either in their 3D model.

Thus only the hard way remains. I need to think more about this, as it seems non-trivial to find all (most) of the cases. I leave the issue open, because I agree with you, underground buildings shouldn't get a positive height in the 3D BAG.

ghost commented 5 years ago

Ok, so I would suggest a topographical check, like buildings on top of each other or overlapping with roads, parks and so on. But therefore you should have some use cases to create a solution and to validate.

Maybe we can collect in this thread some examples or find them by a geographical query

evetion commented 5 years ago

Rijswijk train station is mostly underground and does intersect other buildings. Its id: 0603100000015741.

rijswijk_station

balazsdukai commented 3 years ago

Repo closes because it has been superseded.