Great video. By the way, can you use the M350+L2 handheld (without flying) as a terrestrial scanner ? Can you start the acquisition if the drone is not in flight ?
... Who flies 70ft (21m!) with a lidar sensor? That's not fair. Of course you'll get "good" dataset with this useless height. A "normal" use of L1 and 2 are over at least 180-200ft. Try flying a 350-400ft datasets and then we can make an interesting comparison.
For residential sites, I've flown this height. I would say for larger sites I do fly 200-400 feet more often to capture more land and maintain efficiency. I will do a follow-up video on LinkedIn in the next day or two.
@@adlep because it's useless, and the amount of noise doesn't improve the overall quality of the survey respect a 200ft flight. If the terrain is flat so is more convenient less passes at higher altitude. Remember, in lidar process, the less data you have to align, the more absolute precision you can achieve. In an area like that street, a single pass at 50 or 60m would be enough to achieve same results with less data, less flight time, and last but not least to see a real comparison of L1 and L2. I own L1 and I have my L2 on the way, L1 suffer a lot of noise by the distance, at 100m on flat surface you have about 10cm or more noise spread. At 20m they looks exactly the same while L2 should not be affected (at least not that much I hope, I've bought the new one because of this) medium and long range noise.
Your profile width is 16,4 ft so you shouldn't look at the noise with this large distance because the road has some slope in it to drain water. I would like to see the noise on a smaller width like 1 meter or less to see the actual noise.
I didn't even realize that you could do a width to the profile, I thought it was just on the one axis (Y or X) along with Z. Thanks for pointing that out, I'll be sure to follow this up with a video on LinkedIn.
Hi Rami Very nicely done. I like the way you explain things. I’m a surveying engineer my self, but I don’t practise it now, I hope I will be able to get back to it again soon, the only problem is I am 59 years old and I don’t know if that is a good thing to do. God bless you brother. All the best.
We use Mavic 3 RTK setup with photogrammetry on surface mines. It works really well, except for forested areas. Can this weed out trees and foilage for topo type maps? EDIT. Just got to the point in this video that shows turning off everything except ground point. NICE.
Worth it, not if you fly DJI and are already prevented from doing government related projects in multiple states and growing. Also the DJI sensor is down facing only. Rather get a Resepi sensor.... yes you'll have to sell your children to pay the extra 18K but the sensor takes horizontal sweeps meaning you get sides of buildings etc if you plan the flight properly without the need of a seperate low flight. Also any returns past 3 will often give you a bad reading on flat surfaces and you tend to get ripples on roofing etc, so it is a trade off whether you want better tree cutting ability or better accuracy on regular surfaces (obviously a 150K plus lidar will know how to mitigate these issues but the L2 does create ripples on flat surfaces when past 3 returns).
Thanks @Tamimi. For small artisan underground mine for 3D Modelling of tunnels or shafts do you recommend to use total station? Hand held scanners? Or Iphone lidar scanner?
Ummm...the fact that you chose 5 passes on the L2, immediately destroys any comparison you were trying to do. You should've kept it 3 pass vs 3 pass. This video bears zero credit now.
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For the young surveyor, your content motivated me and gave me a perfect vision for the future of topography survy
Great video. By the way, can you use the M350+L2 handheld (without flying) as a terrestrial scanner ? Can you start the acquisition if the drone is not in flight ?
Did anyone else notice the squirrel crossing the road at 6:23?
Maybe it's just me that saw it cause here in Australia we aren't use to seeing them lol
I just scrolled down to the comments to see if anybody else saw it :)
Hi and Good Spotting
... Who flies 70ft (21m!) with a lidar sensor? That's not fair. Of course you'll get "good" dataset with this useless height. A "normal" use of L1 and 2 are over at least 180-200ft. Try flying a 350-400ft datasets and then we can make an interesting comparison.
For residential sites, I've flown this height. I would say for larger sites I do fly 200-400 feet more often to capture more land and maintain efficiency. I will do a follow-up video on LinkedIn in the next day or two.
why not? if the condition are permitting and the terrain is flat why not?
@@adlep because it's useless, and the amount of noise doesn't improve the overall quality of the survey respect a 200ft flight. If the terrain is flat so is more convenient less passes at higher altitude. Remember, in lidar process, the less data you have to align, the more absolute precision you can achieve. In an area like that street, a single pass at 50 or 60m would be enough to achieve same results with less data, less flight time, and last but not least to see a real comparison of L1 and L2. I own L1 and I have my L2 on the way, L1 suffer a lot of noise by the distance, at 100m on flat surface you have about 10cm or more noise spread. At 20m they looks exactly the same while L2 should not be affected (at least not that much I hope, I've bought the new one because of this) medium and long range noise.
@@panph I see your point. Less data and noise is better…
Your profile width is 16,4 ft so you shouldn't look at the noise with this large distance because the road has some slope in it to drain water. I would like to see the noise on a smaller width like 1 meter or less to see the actual noise.
I didn't even realize that you could do a width to the profile, I thought it was just on the one axis (Y or X) along with Z. Thanks for pointing that out, I'll be sure to follow this up with a video on LinkedIn.
Do you get Terra free with L2 purchase? How high did you fly this job with L2.
Hi Rami
Very nicely done. I like the way you explain things. I’m a surveying engineer my self, but I don’t practise it now, I hope I will be able to get back to it again soon, the only problem is I am 59 years old and I don’t know if that is a good thing to do. God bless you brother. All the best.
You’re never too old to get back into it. My dad is 63 and he’s still surveying!
We use Mavic 3 RTK setup with photogrammetry on surface mines. It works really well, except for forested areas. Can this weed out trees and foilage for topo type maps?
EDIT. Just got to the point in this video that shows turning off everything except ground point. NICE.
That’s the LiDAR difference
looking at LiDar as my next level to move up to
It’s a game changer!
Worth it, not if you fly DJI and are already prevented from doing government related projects in multiple states and growing. Also the DJI sensor is down facing only. Rather get a Resepi sensor.... yes you'll have to sell your children to pay the extra 18K but the sensor takes horizontal sweeps meaning you get sides of buildings etc if you plan the flight properly without the need of a seperate low flight.
Also any returns past 3 will often give you a bad reading on flat surfaces and you tend to get ripples on roofing etc, so it is a trade off whether you want better tree cutting ability or better accuracy on regular surfaces (obviously a 150K plus lidar will know how to mitigate these issues but the L2 does create ripples on flat surfaces when past 3 returns).
Thanks @Tamimi.
For small artisan underground mine for 3D Modelling of tunnels or shafts do you recommend to use total station? Hand held scanners? Or Iphone lidar scanner?
may we know the specifications of your laptop where you use DJI Terra software. How long did it take for you to process those data for 2D and 3D?
Could you pls make a video about PPK with L2 and Matrice 350 RTK? It would be very useful! thnx
Could an L2 be flown on a drone inside a warehouse to survey a crane runway?
Just picked up the L2........about 2 weeks ago. The weather has not allowed me to use it yet. Nice video and thanks for your review.
-Brian
Same here, I filmed this in December knowing the weather would affect us now.
does this exports a CAD file like a plan of the street, houses and sidewalks etc?
Not automatically, you'll have to extract the data and then use it in a feature extraction software like Pix4Dsurvey.
Don't support commies😃
These sensors are junk; it amazes me why anyone would purchase these.
Why is it junk. At 14k these seem pretty good to me. Is there anything better within that price point? Or do you just not like it because its Chinese
at 6.21 squirrel...
There is no need for RTK ?
Ummm...the fact that you chose 5 passes on the L2, immediately destroys any comparison you were trying to do. You should've kept it 3 pass vs 3 pass. This video bears zero credit now.