How Accurate is Drone LiDAR using DJI Zenmuse L2

[@haroldprice1030]

After 50 years of Surveying, starting out with K&E and Gurley transits measuring the horizontal and vertical angles with a vernier scale and measuring linear distances with a steel 200 foot "chain" I am retiring next week. I am saddened to know that I will never get to use these new and exciting technological survey tools. Good Luck to you young people and don't ever let anybody deny you of modern science and progressive thinking !

[@PISQUEFrancis]

Dip Needles, stadia, double right angle prisms ... I too was blessed in the old ways ... I'm no longer licensed, but have some drones ... THIS LOOKS LIKE FUN ...

[@haroldprice1030]

@@PISQUEFrancis Hey there ! You know exactly the era of my humble beginnings ! Thanks!

[@13squared2009]

Can you explain what a ‘return’ is as if I know nothing about this? Because I know nothing about this but find it very interesting.

[@PISQUEFrancis]

@@13squared2009 a pulse of laser is sent to earth(?), and a return is reflected back to the drone... maybe 1/10,000th of a second ... vert short period of time 500feet to ground then 5000.12 feet back to the drone ... simply speaking ...

[@palliard]

@@13squared2009 it's the bounce of the laser off an object, that's the return, the bounce. 3 returns, 3 bounces. I think. We always do 3 returns when trying to cut through tree cover.

[@g1998k]

I am about to receive Matrice 350 RTX with Zenmuse L2 in few days and must admit that your video is really among the first rare really good L2 examples. Thank you so much and will be subscribing for sure.

[@RamiTamimi]

Awesome, congratulations on the purchase, and thank you for being a Survey Pro member!

[@stachoni]

Rami - Terrific video as always. I'd love to see (a) how the relative accuracy of the GCP coordinates measured by RTK compares to those measured with a total station and if that would have any effect on the final result, and (b) an accuracy comparison between the drone LiDAR and a series of terrestrial laser scans.

[@mbtavune]

Thanks, I'm always learning new things from your videos, greatly appreciated!

[@palliard]

Sweet drone / leaf blower, 6:09. Probably want to clear out stuff around your launch site so nothing gets in the blades or scratches the lidar scanner.

[@prodson8310]

I have no idea what you are doing -although I believe you’re doing a great job describing it. I would love to do this

[@nelsonreru4572]

Dear Tamimi, am now a subscribed member.

[@brentwatson4628]

Watching your videos for the first time today. Very informative, clear and to the point. I want to sell this equipment to the company I work for. Surveying job sites would be a great time saver, and efficient for accurate material count. One thing I noticed is the drone you are using, and the fact you aren’t wearing a high viz vest? I subscribed to your channel. Keep up the good work.

[@FlavioFelix-c3h]

Grate job, congrats!!! How long time did you take to make all flight and what the area covered ? I'm interest to know about the productivity of this M350 + Z L2 setup, and use of batteries.

[@TonyFliesINC]

Great Video, RamI!

[@IbrahimAli-l8j]

Dear sir without RTK positioning i could not process the image with dji terra what is the solution

[@Tadamagicsky]

7:22 brilliant...

[@keyable]

Why do we need GCPs when we do RTK survey? I understand it is needed to Check accuracy of the survey, but is it used during processing LiDAR data?

[@zachstinton]

Cool vid. Just a friendly heads up - using GPS under powerlines isn't recommended.

[@maml6479]

Does DJI Terra process LiDAR on the cloud or a server, or on your machine? If the latter, what computer specs do you have?

[@DikravenDylanGalavia]

where to join

[@Ahmedali_-qd9eg]

Amazing! but it very expensive when you work to document Heritage sites🙁

[@rickyguidry9135]

I'd like to call you, I'm a tower manufacturer for communication towers, My question is, can a tower be mapped to get brace sizes and thickness of the angle iron and size of the legs, can it also give me the diameter of the bolts.

[@travisabel4252]

Am i watching Rami or Vice Grip Garage. That intro is the same song

[@aldima2405]

Hi Rami ! Can you share the raw data with L2, i want to compare with L1?

[@seanbrolly3322]

I know the Matrice 350 RTK can have an accuracy of 1cm + 1ppm Horiz and 1.5cm = 1ppm Vert with the RTK correction. what level of accuracy can the lidar produce in areas of high vegetation using the L2?

[@jedisdad2265]

Could this be used to survey a crane runway inside a warehouse?

[@travisabel4252]

Can the L2 pick up distribution lines also or just the transmission lines? Distribution lines are about 0.04"

[@chrisalexander2478]

Rami, I would like to request a video on making a Custom DSM in DJI Terra to be used for terrain follow. Specifically, I have some landfills I need to lidar this year and they have grown vertically quite a bit since the last Satellite DSM and I would like to maintain the same GSD. I have flown them in the past using photogrammetry and real time terrain follow using a Mavic 3 E. I thought this might be a good tutorial for you to make in a future video given that I cant find much info online concerning that topic.

[@MikePrange]

What software or app does the DJI Matrice 350 RTK with P1 Camera need or use for the auto flight control? We are looking at purchasing that drone for aerial photogrammetry and volumetric surveying at our quarry. We currently have an Ebee Sensefly that uses eMotion software for the flight and then we use Pix4D to process all the data. Does the DJI come with flight software or does something else need to be purchased separately? We plan to continue to use the Pix4D for the final processing.

[@petrupreluca2942]

Can you use the pointcloud without DJI Terra? I only have Trimble RealWorks and Agisoft. Will I be able to create a workflow with those?

[@wzfellguard1]

@ramitamimi when will you try out Geo Sun lidars? Answer please friend, or you ignore ppl asking questions?

[@michianadroneservicesllc858]

Love your video. I'll probably look at more. You might add the part about being licensed and the waiver to fly over people and moving vehicles next time so the rest of your viewers know.

[@Inevitability-hq2je]

Serious question: does someone know, what is the maine purpose of the matrice 350 rtx?

[@187Killerbee]

There's a few powerlines missing. Is that normal?

[@Diamondirty]

brilliant video as always , how would you compare the ROCK r360 to the L2 ?

[@RamiTamimi]

That would be very interesting 🤔

[@Diamondirty]

i guess the key difference is the SLAM enabled feature of the R360@@RamiTamimi

[@Rogun987]

The R360 has 2 returns vs the L2s 5. but the 360 has SLAM mode which is pretty amazing.

[@Diamondirty]

yes i beleive those to be the key differences ,but more shots per return on r360 no ?@@Rogun987

[@LeoCastillo-b2x]

Hi, how long does the processing usually take?

[@propylaeen]

why there are missing parts of the power line masts? And what does it take more than buying stuff for about $25.000,-?

[@ryanhariskyawan5125]

For flying height, can it be at a height of 250 m?

[@Rogun987]

Seems like the Terra software still has some growing to do

[@chrismaytubby9822]

Is it compatible with ArcGIS Pro?

[@aldima2405]

Raw data processing takes place in dji terra, and then the cloud can be in arcGis pro😊

[@chrismaytubby9822]

@@aldima2405 Anyway you can send me a small sample. I'm trying to talk out management into getting this setup.

[@liviuciumegu]

great stuff !! for future video maybe reduce the half screen selfie ex. 10:00 min and reduce it to a corner screen, something like Indiana Drones stuff . Thank you!

[@jafetdiaz2419]

maravilloso Rami

[@g1998k]

Dear Rami, can you please clarify whether the MATRIC 350 with L2 can record LIDAR manually WITHOUT a flight plan and whether you can LIDAR the Interior and Exterior of a Building on the same flight and produce a model that includes both WITHOUT requiring two separate flights and models.? I do understand that for practical reasons we do not always have this work flow since the camera cannot scan the full height of an interior floor but we require to have as much information possible on a single model.. Thank you.

[@RamiTamimi]

You can fly manually. You would have to run the calibration to get the IMU warmed up, and then you'll have about 3 minutes to collect data manually.

[@aldima2405]

Wires work well if you fly along them, and if you fly across the wires, they don,t so well. On L1 so

[@christyperez552]

Good day! we're using drone using dji zenmuse L2. we encouter a problem regarding the data. when we transfer from one place to another the elevation is different. we are using Qt modeler. will you help us?

[@christyperez552]

L1

[@outdoorswitholli]

To use NTRIP, are you not connecting to your mobile phone hotspot? Or does this new controller have a SIM card slot.

[@Rogun987]

The RC pro controller for the Matrice can use a SIM card or hotspot for internet connection

[@robertallencad1]

Please sir, Can I have some more data on this!

[@keyable]

Does L2 with 350 RTK have PPK capabilites? Thnx! if yes, could you please make a video on it? Would be very useful!

[@RamiTamimi]

Yes it does, I will definitely put something out about it in the near future!

[@keyable]

@@RamiTamimi Thanks! will be waiting for your next video.

[@aldima2405]

Even M300 RTK with L1 has such opportunity

[@adlep]

Rami, next time around let me know - Ill bring my Aeropoints 2.0 to help out. I am less than a mile away from you.

[@JakeNorthernNJ]

Nice video but violating FAA part 107. But you know this since you are a licensed UAV pilot.

[@benitto5692]

Excellent video👍, thank you for sharing with us

[@davidkierzkowski]

Good old Canterbury drive lol I can see my house

[@Guide504]

Did you ok all the houses you are flying over, the children who would be hurt if there was a problem... This weight of machine in the UK would not be viable for overflight due to regulations

[@ronaldmacdonald1268]

dont forget to say the whole cost arount 30 000 Euros

[@ektorthebigbro]

man just use reality capture, it has all the bells and whistles and it is free now

[@allanjarrettbasi78]

No thanks I'll wait for L3 instead.

[@elverarardon7100]

Promo SM 🤪

[@careljansenvanvuuren6594]

DJI have great drones, but support is pathetic

[@gmwillis2000]

Are you violating FAA federal rules? I did not see you observing and keeping the drone in sight.

[@RamiTamimi]

Nope, drone was in site the whole time.

[@scottkarlins]

Also was flying over public roads with people and moving traffic below. Not allowed per Part 107! At least for the first and last legs...

[@ketzariver1]

It would be good to see this unit reviewed with vegetation which is the selling feature of LiDAR.

[@flyinlo1474]

@@scottkarlinswww.faa.gov/uas/commercial_operators/operations_over_people

[@gmwillis2000]

Yep. I believe you BS @@RamiTamimi

[@johnh1967]

Great video, really informative. But what on earth is an "international foot", you guys needs to move on from this insane medieval measuring system :-)

[@RamiTamimi]

Hey man I didn’t create the system, I just follow it 😂