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naraburns  nihil supernum  1yr ago (text post)   3176 thread views

Friday Fun Thread for December 30, 2022

Welcome to the final regular thread of 2022!

Be advised: this thread is not for serious in-depth discussion of weighty topics (we have a link for that), this thread is not for anything Culture War related. This thread is for Fun. You got jokes? Share 'em. You got silly questions? Ask 'em.

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I've been very loosely intrigued by the advent of phone-based lidar systems like the one that's apparently now included in modern iPhones. Do you (or anyone else) have experience using these lower-end lidar systems? How big is the gap between that system and the next highest price tier of specialized lidar equipment for a casual user who is not surveying professionally?

We have a small (2-3 acre) rural property that's very non-uniform in shape, elevation, orientation of structures, etc ... is it within the realm of possibility that I could use one of the lower-end iPhone systems, paired with e.g. a smaller DJI flight-programmable quad drone, and wind up with a scan that, if not inch-accurate, would be broadly useful for planning or visualizing new constructions or modifications to existing ones? (I have the 3D/CAD experience to get the rest of the way once I have a point cloud.)

I have the impression that even the low-end lidar might be more dimensionally accurate than doing a traditional, camera-based photogrammetry session with, say, the same iPhone + drone setup. Is this correct?

A reasonably-accurate scan of our property and the ability to do it for others would be helpful and fascinating, but not five-figures helpful or fascinating. Maybe four figures if the first figure is a 1 and if it's also equipment I can do aerial photography with. Depending on how usable the scans are at what scales, I could see myself getting into scanning for all types of projects of smaller scope once I've got the equipment.

For something as large as a scan of the property, though, would I be better off trying to find someone locally who I could hire to do it once with very good equipment?

I have not personally used any phone-based systems (or point clouds from such systems). However, based on some YouTube videos that I've watched (1 2), it's my understanding that phone-based lidar systems work only at short range, and therefore are not suitable for scanning large swaths of terrain.*

For your purposes, photogrammetry may be more convenient. The OpenDroneMap software (1 2 3) can digest aerial photos and spit out a point cloud. (Disclaimer: I do not have a UAV and have not used this software.)

*Phone-based systems can be useful, though. I recall attending one presentation at work (several years ago) where our resident tech guru gushed over his test of a phone-based system (I don't remember whether it was lidar or photogrammetry) in surveying the corner of an intersection, which would be very convenient for designing ADA-compliant curb ramps.

No new information to add here, just thanking you for the helpful response. I think I'm going to dive a little deeper into the world of photogrammetry.

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