Thanks for your explanation.
Now its snowing here, and is too dark and not pleasant being at the lake. As soon as weather clears a little bit (Forecast says around next wednesday - colder but clear), I'll perform a real green laser check.
Heating would not have to be a problem for an underwater vehicle.
Will try to look for a simple cheap and cooled installation for green lasers.
Once tests done, I'll post results on here.
The topographic projection sounds quite nice. But you're right, distortion is a problem.
Anyway, using an image features analisys sofware, for measuring the apparent distance between both projected dots, from the camera image, could give a reasonable measurement of distances and object size.
I must point, once again, that electronics is not my thing. My "real-world" work, goes on ships design, but mostly directed to the "fluids" part (hull, appendages, propellers ......)
In the software side (DPS, data packing, ....), I had to recycle myself due to company requirements. So Im able to help on that side as well.
Another thing Im concerned about, is the way wiring crosses through the electronics container.
I think it is a key depth range limitating factor.
Regards and thanks for your comments again.