Terrestrial photogrammetry (with a pole)

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pfidler
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Terrestrial photogrammetry (with a pole)

Post by pfidler » Fri May 31, 2019 10:00 am

Good morning!

Does anyone use terrestrial photogrammetry in conjunction with laser scanning? I've been trialling using a pole-mounted digital camera with mixed results. The main use is roads and corridor mapping.

I'm currently using a Nikon D3300 with an 18mm lens on a 5 m pole.

Can anyone provide some tips for ground-based photogrammetry? What is the best technique to capture road environments?

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Re: Terrestrial photogrammetry (with a pole)

Post by 3DForensics » Fri May 31, 2019 1:06 pm

I've done roadways using a couple of different methods. One is using video on my camera and I simply walk in overlapping paths down the section of roadway I want to capture. The other is using photographs (also overlapping). I have a remote trigger that I use on top of the pole. I have even had pretty good success using a GoPro.
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Cheers!

Eugene
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Re: Terrestrial photogrammetry (with a pole)

Post by max72 » Fri May 31, 2019 1:28 pm

It you are allowed, definitely use a drone for this kind of mapping.

I used photogrammetry with a camera on a pole for buildings and facades, but never for roads.

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Re: Terrestrial photogrammetry (with a pole)

Post by Ioannis » Fri May 31, 2019 2:30 pm

Also check that company http://www.heliceo.com/en/produits-pour ... grammetry/
A mirorless camera with triger and gps for positioning i think.

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Re: Terrestrial photogrammetry (with a pole)

Post by pfidler » Mon Jun 03, 2019 2:13 pm

Thanks for the reply folks. The heliceo device looks good but I'm limited to what we have regarding kit (at the moment).

Eugene, that survey looks pretty good. Regarding the photograph process, do you aim the camera down, say 45 degrees, and take photographs in both directions along the road? I attempted to take photographs from both footpaths (on a road with road markings) but I can't get consistent results. I've tried Agisoft's Photoscan and RealityCapture and the results are similar.

I've surveyed a couple of vehicles and got excellent results, I just can't seem to replicate the process with roads. Here's a car I surveyed...

https://sketchfab.com/3d-models/4e7dc24 ... bc31d6c3fd

What lens do you use on the camera? I'm wondering whether a wider angle would help

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Re: Terrestrial photogrammetry (with a pole)

Post by 3DForensics » Fri Jun 28, 2019 1:25 pm

Sorry for the late reply...been busy with travels overseas and trial.

To answer Paul's question, yes. I pointed the camera down as far as I could go and just before I would capture myself or part of the pole. I am not using a very wide angle lens, except in the case where I use a GoPro camera (which also worked quite well). I take small steps and stop in between to make sure that I get a blur free photo and ensure that I have lots of overlap. If I were to try this again, I might go with a camera that does 4k video and has a higher frame rate. It will be a huge video, but when the images are extracted, you have a perfect set of overlapping images to process.

Paul,

Try a very small set with the camera pointed down as far as you can go. Don't bother capturing anything on the horizon. See how that goes and let us know.

Eugene

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