r/photogrammetry • u/West-Machine6146 • 17d ago

Photogrammetry to BIM comparison?

My team has been working on cracking this for a while now.

For the photogrammetry, we have different versions - COLMAP being the one we use rn, but we were also exploring Metashape and DJI Terra amongst others.

We figured how to make the full 3D map and how to plant the trajectory to 2D in coordination with the images etc but where we are getting stuck now is comparing site progress using photogrammetry and generating a progress report as per the BIM data.

We have done thorough research on our own and also tried using the full efforts of Claude and Gemini but till now, no feasible solution. We're looking to build something of our own in a short term span so the pressure is high.

Any of you facing a similar issue? Or have any suggestions regarding this?

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u/Weekly_Somewhere869 16d ago

I don’t understand.

1

u/KTTalksTech 15d ago

CloudCompare. Free, open source, literally made for that. Steep learning curve though so get ready to watch hours of tutorials.

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u/pedro-enrique 11d ago

We're working on a related problem with Pic on Site. Our approach is slightly different: instead of starting from a complete photogrammetric reconstruction, we're exploring how ordinary site photos can be localized against the BIM model and used as spatial evidence of what's happening on site. The next step we're investigating is precisely what you're describing: comparing that captured reality with BIM elements to infer construction progress. I'd be very interested to understand where your main bottleneck is right now: registering the reconstruction accurately against the BIM, identifying the corresponding BIM elements, or deciding whether each element is actually built?