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Hi. I understood some parts of the video but mostly went over my head 😅. Do you think someone using gps base/rover for machine control and building 3d models needs to worry about this? Typically when control is provided by a surveyor I'm assuming they already calculated all this by the time we get the control point info. It's for some smaller jobs that I've figured out I can take points using known projections (like 16:15), but since I assume this is in grid, wondering if it will cause me issues later. Thanks for the content!

As a field guy just starting to process data, I can safely say you have probably forgotten more about survey then I know! Loving the channel it's been very helpful on a variety of topics.

Am doing a project relating to the accuracy of the LiDar but since a liDar gives a million points,how do I get the nearest point to my control point

I own a Topcon Hiper VR and an Emlid RS3 and RS2+. The Hiper is much easier to work with giving better results overall and better presentation on the FC-6000 data collector. The RS3 with its tilt capability of near 60° is nice at times. I would like to see a face off between the Hiper VR and the Trimble and Spectra if you could do one. Also the difference between Pine Trees and Oak Trees is significant. My motto "Pine Trees suck". If I'm near pines I move somewhere else to get the shot if I have to traverse in with the Robot so be it. Don't trust Pines.

Thanks for this! Can you have survey methodology for layout and checking of plumbness of offshore piles? Thank you.

Great video. Looking at getting an emlid RS3 as a dedicated base station for my Mavic 3E.

Very clear explanation. Perfect for me, working on a degree in Surveying Engineering Technology.

A lot of work must go into preparing the videos. The effort is much appreciated.

Great video really helpful, thank you! I tried to download Helmert LISP from your link but there was nothing in the folder. Any way I could get a copy of that?

This is very informative, thank you.

Great content, thank you. For me, the struggle is the practical application. In other words, managing the implementation. Another hang-up for me is understanding what software packages are doing to your observations. Just keeping the oranges and the apples straight!

"Deer in the headlamps" hahaha I'm with you on that one. I'm based in the United Kingdom and hardly anyone understands the grid ground situation. I've almost given up trying to explain it . Usually, I just tell them, I'll do the site control for total station and the GPS set up for the machine guidance. Now I'm going to tell them to go away and watch this video then come back to me 😂 . I've been a subscriber for a while and I'm going to recommend your channel to site engineers over here as your videos are pretty clear and concise. Only thing I struggle with is trying to convert in my head what thousands of a foot are in millimetres 😂😂😂.

Very helpful. We do earthwork in Texas. I import points / lines into our Trimble software and toggle on the aerial imagery. If it lines up, then 9 times out of 10 it means it is on our local grid coordinates and ready for use on our mixed fleet of GNSS equipment without localization. If it is shifted 1,000ish feet northeast, then it is on ground coordinates and means a bunch of wasted time going out to shoot controls. On occasion I have been able to get the scale factor from the engineer, but I have never been able to get it to shift quite right. It's close, but not right. We have always questioned why everything can't just be on grid coordinates. It makes a lot more sense now.

Thank you!

Sometimes I wish the Earth was really flat.... things for surveyors would be so much easier :D

Great vid! Would love to see this with 3D animations showing everything in perspective!

A clear and concise explanation, thank you!

Excellent content, this is quickly becoming one of the best surveying channels on RUclips. Thank you so much

I'm so glad you're making these videos. I try and explain this stuff all the time, but usually it's a messy doodle that doesn't stick. This is a perfect reference and precisely why you're my favorite youtube Surveyor.

Relationship. That's what it all comes down to. Excellent job in thoroughly explaining this consistently misunderstood subject! Thanks!

For a more practical question, which method do you think is best for mixing GNSS and Total Station data perfectly: 1) GNSS site calibration using total station control points (4 or more) - Obs.: this requires a set of TS control points in the entire boundary of the site, and as you go out of this calibration boundary you start seing more distortions and errors, so you have a really big effort to keep increasing your control boundary with TS; 2) Finding an avarage and good combined scale factor (CSF - grid scale factor x altitude scale factor) and applying for the entire from a base or some virtual point in the aprox. geometric center of the area; 3) Finding a combined scale factor for every single point and applying it individually for every point to convert from UTM grid to ground, just like Leica Infinity does, by "Holding the Base Point" coordinate, and applying combined scale factors for all the other points. The question with this, is that you must always be scaling from the SAME base point to get the data consistent. I generally go for the method 3) and I use the most precise coordinate from base and the "pivot"/"hold"/"escaling" point for applying the combined scale factors from it, but sometimes this base point it's not in the aprox. geometric center of the area. I see a LOT of people that does not takes this in account but it REALLY makes a difference. IMO, we should be ALWAYS working with ground coordinates, but because GNSS is so powerful and cheaper nowadays, we see mostly of data being taken on grid but it can bring MANY troubles when staking out a job. Can you clarify how to NEVER get things wrong mixing data? Thanks!

Studio update is looking fresh! Is there a possibility for a resection vid soon?

The most waited video for me and the most beautiful subject and discussion you could make a video! If I could give an oscar to some RUclips channel, would be to yours! Thanks great man...

always something to learn. Thanks

Thanks for the informative videos. I'm interesting in reading your whitepaper but, when I click on the link in the description I only see your excel program. Any help would be appreciated.

Have you done any kinematic scans with it?

Great channel It would be good if you explain from start to finish the setup first order control network job combining static cps survey data travers shots with ts and elevation correction using leveling and elevation transferring all together using leica gnss and TS using leica captivate step by step including reporting all the data from those observations to use it in starnet :D

thanks for video, ı have a question about image direction. I see that you’ve uploaded a KMZ file. Let me first examine the contents of this file to understand its structure and check if it already contains information about the image direction. Then I’ll help you with how to visualize the image direction in Google Earth Pro.

I appreciate the video; great content as always 😁

Great video, but in the competition, you should have used both prisms to eliminate the variation between your performance and your coworkers performance. Despite that, this is an awesome video. Thank you.

You are Amazing !!!. Can you show us how to add base map background (GoogleMap or OpenStreetMap, ...) workflow, I really appreciate, Thank you

Excellent, excellent video! I've been selling and supporting Trimble equipment for 24 years and have never seen such a thorough and sound comparison. And we agree that 200 channels is more than adequate - and the rest is marketing. Additionally, we tested the Trimble R10-2 (same specifications as the R12) against the lower cost Trimble R2 and recorded more accurate results from the R2 around heavy tree canopy.

This is a super dry (like watching paint dry).....but an absolutely necessary to understand subject (for all of using GPS). The effort by the NGS to correlate conventionally leveled orthometric heights, with ellipsoidal heights [for the purpose of developing better geoid models], was known as "Height Modernization." This is probably over-simplifying it, but I like to think of building a geoid model as bending a ruler.....for the sole purpose of correlating an ellipsoidal and a geoid height to produce a result that agrees with previously determined orthometric heights. You did a fantastic job explaining a somewhat difficult subject!

Great video as always

Great description. This subject can be quite confusing and you do a really good job of breaking it down. Your channel stands above most other survey ones on RUclips. When Geoid 03 came out I mapped the difference between it and '99 and was really shocked at how much it had changed. If you haven't done that, I recommend giving it a try. I kept it to my local area (So Cal) but you can do it at whatever area and resolution you'd like. What you do is create an 'elevation' grid using N as the 'elevation' on both geoid models (there are a few ways to do this). That alone creates an interesting contour or shaded surface of that geoid model for the area you cover. The real interesting part is if you do a delta surface between 2 geoid models and contour or color that. It basically shows what you described in your comparison between N over 1km vs 10km, but for a wider area. I did all this because we had 2 crews working on a topo project. One of them started the base and the other just connected to its correction message and started working. The base was set on a known control point. One of the crews couldn't figure out why the were seeing a different elevation at the base and couldn't get a good check. I got called and after a while I realized what they had done. One crew was using 99 and the other was using 03 in their project setup. When the base was started from a data collector using G03, it dutifully computed h and was sending that ellipsoid height to the rover over the RTK radio. Then when the rover received that ellipsoid height, it dutifully computes that h into an ortho height using the geoid model it has. What you say is absolutely true; our software can make a very complex system seem simple and we have far too many button pushers out there. We now have contractors doing this geodetic surveying and I've heard some frightening stories. Half of these guys got their training from a guy they know who was shown how to use this by a sales person. I'm working to fix that in California. We have Professional Registration and protected practice laws for a reason. The public needs to be able to trust that the people they are paying to do work are reasonably competent. As far as I know, no version of RTCM or CMR has ever included the geoid model in its correction, so the rover has no way of knowing what went into producing the height of the reference. I created the delta N surface I described to see for myself and share just how dynamic geoid models can be. I thought about doing the same thing when subsequent models came out, but never got around to it. In my area, we've had a really good gravity model since '03 came out. We're lucky in Coastal California, because we have a lot of economic activity, which lends itself to having a lot of Land Surveying, which in turn means that we end up with a lot of data in NGS models.

Thank you for sharing!! You always do a great job with explaining and really breaking down the content and you do it in a manner that's easily understood! You always pick great topics that aren't of talked about, but are very important in this industry! Thanks again for sharing!!

Great description. This subject can be quite confusing and you do a really good job of breaking it down. Your channel stands above most other survey ones on RUclips. When Geoid 03 came out I mapped the difference between it and '99 and was really shocked at how much it had changed. If you haven't done that, I recommend giving it a try. I kept it to my local area (So Cal) but you can do it at whatever area and resolution you'd like. What you do is create an 'elevation' grid using N as the 'elevation' on both geoid models (there are a few ways to do this). That alone creates an interesting contour or shaded surface of that geoid model for the area you cover. The real interesting part is if you do a delta surface between 2 geoid models and contour or color that. It basically shows what you described in your comparison between N over 1km vs 10km, but for a wider area. I did all this because we had 2 crews working on a topo project. One of them started the base and the other just connected to its correction message and started working. The base was set on a known control point. One of the crews couldn't figure out why the were seeing a different elevation at the base and couldn't get a good check. I got called and after a while I realized what they had done. One crew was using 99 and the other was using 03 in their project setup. When the base was started from a data collector using G03, it dutifully computed h and was sending that ellipsoid height to the rover over the RTK radio. Then when the rover received that ellipsoid height, it dutifully computes that h into an ortho height using the geoid model it has. What you say is absolutely true; our software can make a very complex system seem simple and we have far too many button pushers out there. We now have contractors doing this geodetic surveying and I've heard some frightening stories. Half of these guys got their training from a guy they know who was shown how to use this by a sales person. I'm working to fix that in California. We have Professional Registration and protected practice laws for a reason. The public needs to be able to trust that the people they are paying to do work are reasonably competent. As far as I know, no version of RTCM or CMR has ever included the geoid model in its correction, so the rover has no way of knowing what went into producing the height of the reference. I created the delta N surface I described to see for myself and share just how dynamic geoid models can be. I thought about doing the same thing when subsequent models came out, but never got around to it. In my area, we've had a really good gravity model since '03 came out. We're lucky in Coastal California, because we have a lot of economic activity, which lends itself to having a lot of Land Surveying, which in turn means that we end up with a lot of data in NGS models. On a side note, I'm curious whey there are out of context messages below that are 2 months old for a video that was released today....

Also ignoring elevations with a gps can introduce horizontal errors. This is more to do with scale factors, but having -999ft in elevation as a set of points to layout in gps is going to be feet off if your site is say at sea level when you check the distance with a total station. So getting elevations correctly is important for gps not just in verticals but horizontals also.

As always awesome content, awesome format and awesome explanations! Nobody gets into the weeds and pulls them up at the roots like you!

Seems to me the quest for standardization has created more confusion and can introduce more error than is worth the cost. I may have missed it, but can after-the-fact corrections be made for the misstep of failing to specify a GEOID model when doing the fieldwork? I'm new to this GNSS stuff and I've tinkered for over two years with my equipment and technique to where I have finally achieved 6" accuracy. Hoping closer study of this reference frame and modelling stuff will get me closer to tenths accuracy. Thanks for your videos!

Your videos and explanations are much better, more detailed and clear than all my professors together lol (Brazil follower here). Outstanding content you have in your channel and I always waiting for your content. A big service for future generations and people of interest! Thanks great man. 🙏👏👏👏

thank you!!

thank you

Hy try to compare trimble r12i with some models that have Motherboard Unicore um980 with 1408 channels like hi target v500 or satlab sl7 or stonex ... this Motherboard and new genration of IMU I think that will surprise you

Your channel deserves way more attention. We are extremely grateful for all the hard work you put in on top of your daily duties.

I tried downloading the program, but the link is expired. Where can I get it?

Thank you. Very thorough and thoughtful process. This is valuable information to consider.

That's great. I want a comparison video china based GNSS south inno 7 , CHCnav i93, Leica GS 18t, Trimble r12i

This is so awesome! Glad to see BCIT getting some screen time here. Your channel is awesome and inspiring!

Great! cannot wait to see more videos. I really enjoyed your educational content.