Nice and complex video. So my question is why you choose ppk method when you could have faster embed geotagged photos with the rtk method. You use the same correction equipment for the both methods so the errors should be about the same. I get it that you have more control over the ppk than the rtk but does it really win when you compare effciency over precision and error control ? At the end you will stil compare with a gcp data aqusition.
Depending on the location you may not be able to feasibly run RTK corrections to the drone consistently if there are lots of obstructions in the area. (ie. remote areas with poor access and lots of trees/undulating terrain, etc)
As always, great straightforward content. Can you provide links to the gear necessary to put together an M2 rover. Do you have a LoRa hanging off the pole as well?
Hey Bob. There is no LoRa radio. If I was going to do RTK it would be using the free Emlid Caster service or using a service in Mississippi (I get one free base in North MS). If you had a situtation where you needed to use LoRa then I would go with the Emlid RS2+ Units, not the M2. For RTK via Internet (you have to also include a Jetpack with your setup to provide Internet to the M2), or just doing straight up PPK, then the M2 will be fine. The gear was the Emlid M2 receiver, and this antenna. You can buy the antenna from them direct or I believe Mouser sells it here in the USA. It is cheaper to buy it direct (I believe so anyway). www.ardusimple.com/product/calibrated-survey-gnss-quadband-antenna-ip67/
Hello thanks for this accurate video, one question, I can we do when we are in an area without any CORS station around, I mean really nothing; Can we just use the base and rover information to accomplish the mission ?
I used the M2 with an Ardusimple Antenna. I had sold my RS2 units and used the M2/Ardusimple units for a little bit. But I have since got the RS2+ units. The M2's are good if you are on a budget but I sure do like the convenience of the RS2+ units!
Is your Base-Rover setup connected via LORA radio or all these independent logs? Is LORA worth doing in a PPK workflow? I notice that in Reachview my Rover says "FIX" when I'm using local radio RTK between Base-Rover. I didn't see Lora antennas -- is it because your EMLID are older and dont have LORA?
Thank you for your greate work! One question, what is the frequency of logging do you recomend for base station and for drone gnss (if it as a added kit)
It is sufficient to use 1hz on the base and rover for GCPs. You could use 5hz for ground rover if desired. The drone gps add on kit is usually set to 14hz. Hope this helps
Really good video, thank you. Do you know if the raw GNSS files suitable for PPK are also generated when using the Mavic 3 in the Thermal version (M3T)?
HI Cali. As long as you have the RTK module installed on the M3T then the PPK files are generated. However, I now believe it is much better to do RTK flights if using the Emlid RS units and use PPK as a backup if you have problems with your RTK flight. More satellites are used for RTK than for PPK.
So I’m confused why do you need the RTK module if you’re doing PPK? If your using the RTK module with the the base station or a NTRIP that’s not PPK. So what are you using the RTK module for?
Hi Jon, the reason is that without the RTK module the required gnss log files are not recorded to do PPK. It is also a higher quality L2 antenna. Hope this helps.
Myka, let me clarify a few things. 1. In 2024 you should be flying the Mavic 3E in RTK. There is no reason not to fly RTK if you have a Emlid Receiver or a Stonex S900/S980 receiver. 2. Emlid Studio offers free PPK processing for any DJI Enterprise RTK drone. (the M3E requires the RTK module) 3. EZsurve is software that I have owned for many years. EZsurv, TopoProcessing and Emlid Studio are all doing the same thing. But Emlid Studio does not do reprojections where as EZsurv and TopoProcessing do in fact do reprojections for the PPK processing. Hope this helps.
@@DroneMappingTools thanks for the prompt response. My question was mainly a newbie question because I am learning the data processing workflow from A to Z and all the steps required. It is hard to find good literature or videos with the explanation why this or that step is required. Also, I am not sure why to do the reprojection so trying to gather as much info as possible. Great video btw, learned a lot.
Perhaps I missed it but typically I will have 3-4 folders of data each with their own obs and mrk files. Does each folder of data need to be processed separately with their respective files?
For RTK it is not connecting to the antenna directly but rather to the NTRIP network. The RS2 may be the base for the correction but you are actually connecting to the network. So the base can be any base and not just RS2 or DJI base. For PPK it can be any base and you will use the Rinex file from that base to do the PPK processing.
When you have the RTK module installed, the Mavic three enterprise will automatically log the GNSS data files needed for PPK processing. You would then use your own local base files or a CORS station as a reference.
@@DroneMappingTools thank you for the quick response. I got my M3E yesterday and did a 2d ortho in my neighborhood using drone deploy . I do see the ppk files there, that’s awesome. 79 acres under 18 minutes that is insane at 250 ft. That same map plan with my Mavic 2 pro was over 40 minutes with 3 battery changes
I now do RTK on my Emlid 3E 99% of the time. I only do PPK on the Lidar flights as they require PPK processing. If you are not doing RTK on the M3E, you should be. The results are awesome. I did a video on multiple options for setting up RTK on the M3E using the Emlid RS2/ RS3.
If you’re doing PPK or RTK, for 10 acres. I think it is adequate to have three checkpoints to validate the accuracy of the data. But you always need to have checkpoints in order to validate the accuracy for your client. You can always collect extras. It is better to have them and not need them then the other way around. If I collected five points on a 10 acre lot, it might be that two of them needed to be used as control in the other three could be used to check points. It would just depend on how accurate the results were. I hope this helps.
Where is the Mavic 3 E setup and flight? Is your M3E connected to a free CORS or the base station? We don't get free CORS in Texas.. How does that work? Is my M3E broken? The RTK module will not connect unless it is logged into some kind of of NTRIP. I was hoping this video was going to go over all that. Would you please make a video on how to setup the M3E with the RTK module, no CORS (we can download the files for PPK processing), and with the inexpensive base and rover? Thank you very much.
Hi David. The Mavic 3E is an awesome little drone. If you are going to do PPK, then you only need software to do the PPK processing. You will obtain the data files from your Mavic 3E (photos folder) and then you will download the CORS log file (free of charge) if you do not have your own base station. The TopoDrone PPK Processing does an excellent job for that. If you want to do RTK, then you must either 1) have an RTK service which is usually very expensive. The lucky folks in FL get free RTK all over the state. That is the only state in the USA like that. In Mississippi I get one free RTK base. So I will take that. Option 2) is to have your own base unit that can provide RTK service to the drone. The only base I am aware of is the Emlid RS2+. You get FREE Caster (NTRIP) service thru them when you have the RS2+ so the only thing you need is an internet connection in the RS2+ and your Mavic 3E controller must also have an internet connection (via wifi). I hope that answers your questions. If not, write back and I will try to clarify.
@@DroneMappingTools Thank you very much for the reply. Definitely helping my understanding. So, just for my ignorance, if I'm doing PPK, there's no need for the RTK module on the M3E? Thanks again.
@@davidbowles5263 David, you do in fact need the RTK module (whether doing RTK or PPK). The RTK Module ($700) is required in order to generate the GNSS data files needed to do PPK processing. If you do not have the RTK module installed, it will not generate the files and it would be like flying a regular phantom 4 pro, etc. in terms of photo data.
@@DroneMappingToolsThank you again for the reply. I'll call DJI and ask them why my RTK module will not connect to the M3E. Your patience is greatly appreciated.
@@davidbowles5263 David, just for clarification.. do you have the RTK Module installed on your Mavic 3E? Here is a photo of the module. (topodrone.com/product/uav/228/233/240/mavic_3_enteprise_thermal/1341/ ). I do not understand your issue when you say that the "RTK Module will not connect to the Mavic 3E". The RTK module just screws on to the top of the Mavic 3E. Then once it is installed, you just fly your mission and the necessary files for doing PPK processing will be saved in the image folders. If you desire to do RTK flights, then you have to have RTK service and you will enter your login details for the RTK service in the DJI Pilot 2 app. But once the module is attached to the top of the Mavic 3E, you can do PPK processing regardless of whether you fly with RTK or not.
Absolutely. To get a fully functional trial go to www.topodrone.com/downloads/ Scroll down to > 3. Software and there you will download the software. After you have installed it, you will register with TopoDrone for a free account and trial of the software.
Francois, TopoDrone has two versions of the PPK Software. One is PPK Procesing and the other is RTK Processing. When you use the RTK Version, it will expect the OBS file from the M300 or Mavic 3E. There will be 4 files in each folder and one of them will be the OBS file instead of a UBX file like you would have on other PPK systems.
@@francoisbadenhorst3759 send me an email thru the contact page here and I will then reply to you. Just cutting down on the spam bots :) www.dronemappingtools.com/pages/contact
TTK Ironfist, you can can certainly do PPK if you are using the RTK2 base station. The D-RTK2 base station is for RTK so whether you are using the D-RTK2 or using an Emlid RS2/ M2 as a base, you can still do PPK on the drone flight later (as long as you have the RTK module installed on the Mavic 3E which would be required for RTK or PPK) I would think that is understood but want to clarify. PPK is completely separate from RTK. I hope this helps!
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