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SimonBrown

AFV432 - Underwater GPS and Measurements

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Many of you will know I'm into a) armoured/tracked vehicles and b) underwater photogrammetry. I also err towards doing stuff with accuracy and for topside models I like to use GPS to drive the accuracy and location of what I scan.

Up until now underwater GPS has been, to put it bluntly, a bit problematic. Radio waves don't penetrate the water and us divers can't use it.

Until now. Last week I was working with the Finnish manufacturer of an underwater GPS positioning system. Its a seriously good bit of kit - still beyond your average diver but very cost effective.

Anyway, I ended up scanning an AFV432 hulk. I have scanned it before, but did it again using the GPS feed to locate the cameras and scale the model:

https://sketchfab.com/3d-models/vobster-quay-afv432-3d4821a40fe44b4283068062a3a0e9eb

I could do with verifying the scale/size of the model - some check dims work out to be plus/minus 3% or thereabouts - but does anyone have a 432 close by and wouldn't mind running a tape measure over theirs for me?

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Sorry I can’t help you in your quest Simon, but what you post is always interesting. The resolution on this is amazing, so I just wanted to say thank you.

Steve.

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No problem Steve, I will be doing the measurements tomorrow.

Thanks again for posting Simon, fascinating stuff !

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Simon.

Here are the measurements you asked for. Sorry it took so long.

A = 2580

B = 4250

C = 2820

D = i could not access the mortar hatch due to stuff being piled on top.

E = 1235

F = 1005mm

I hope this helps.

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16 hours ago, daleheywoodtanks said:

Simon.

Here are the measurements you asked for. Sorry it took so long.

Many thanks for these. Once the latest model has finished running I will check the actual vs model values.

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Who is the manufacturer of the GPS kit, out of interest?

Andy

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