What is Survey grade accuracy? | Drone Photogrammetry Mapping & Lidar Deep Dive

[@norsenomad]

Very informative and useful video. Thank you for crawling down that rabbit hole!

[@jjnxyz4368]

The Resepi with the Hensai X32 is only around $30K and definitely not 50K for the sensor. Most lidar especially the Resepi line have GPS that you attach to the drone via a gopro mount, you have to use a base but they can get corrections for RTK or do PPK. Also drones with a 10KG weight limit like the Carlson CRD1 do have RTK.

[@Rogun987]

I use a combination Total Station and GPS to check shots when possible. The problem with using a GNSS receiver, every shot has a plus and minus tolerance. So say you have elevation thats 50' on the dot. The GPS might measure 50.15' or 49.85' giving you a possible gap of 0.3 in your vertical measurements. So i'll average one GPS shot and shoot as many check shots with the TS I can in order to maintain good horizonal and vertical throughout the site

[@sebastiandemuria4317]

I like your video providing precise data. BTW, I have emailed you to receive information and learn whether we may have a video conference. Thanks and keep going like this :)

[@davidmaly5464]

So what kind of accuracy can photogrammetry attain if we have known control points that we can rotate and shift the model to?

[@SteelCityDrones]

One tenth of a foot.

[@davidmaly5464]

@@SteelCityDrones can a mini 4 pro attain this? ... and what software is best for this.... Not really for mapping but old buildings for pre construction and castles here in Europe

[@SteelCityDrones]

@@davidmaly5464​​⁠. Mini 4 is not a mapping drone it is good for taking pictures for various applications. It’s really far from ideal but it can produce decent pics.

[@AhmedAli-hi1xi]

Hi Is the Phantom Rtk camera good for mapping? Do I need to plan a double task to get a clean ortho mosaic without shadows? What should the camera angle be

[@SteelCityDrones]

Yes the P4RTK is a good mapping drone.

[@BracaPhoto]

Soooo how do you get survey accurate ?? 350 RTK - L2 and Control points ?? Do i need NTRIP ? How many control points does it take per acre to verify ??

[@SteelCityDrones]

Equipment wise you can use the Mavic 3 Enterprise E version with RTK (DRTK2 or NTRIP) or the M350 with P1 camera. Number of control points varies a lot, many factors to consider.

[@naeemulhoque1777]

Lidar would be helpful for night time environment

[@WickedMatter]

I’m a power and gas engineer, we don’t work with that much accuracy. 😂 1-2 inches is way more accurate than I see in the data that comes to me.

[@droneoccitanie]

I want the same tee-shirt.

[@daustonian9331]

Why do we say accuracy within 1/10th of a foot instead of 1.2”? Sounds like a George Carlin routine 😂

[@SteelCityDrones]

You will never hear a professional say 1.2 inches.

[@daustonian9331]

I realize that as you are not the first I’ve heard say this phrase. A mathematician, data analyst, etc will ask a similar question as it makes little sense to be so verbose to come to this conclusion - thus my George Carlin comment. The good thing is it’s all the same in the end (unless you want 3cm, then it’s 1.18” :)) Great channel and thanks for the quick reply to a nonsensical comment to begin with!

[@utilitycoordinator6339]

Because in the USA, surveying is done in decimal feet not feet and inches. ie: 15.25' not 15'-3".

[@daustonian9331]

Fair enough - but begs the question, why not just use a base 10 system if one exists already? Science fields do, medical fields too. Another question I’ll have for the pearly gates!!