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Everything posted by GAProctor

  1. It is described as RTK, but I don't see the RTK unit(s) anywhere in the photos?
  2. There are now many powerful, lower cost LiDAR sensors available. The issue is putting them to use. It is no easy matter to effectively mount a sensor to a drone and sync it with an INS or IMU to get any kind of usable output. There are other issues as well such as number of returns, FOV and signal strength to consider. The good news is the good sensors are coming way down in price and that will benefit the drone mapping community eventually. What we need now is for the price of survey grade IMU's and INS components like the applanix to come down in cost.
  3. Chuck, What do you mean by "really liked the developers"? I used Zephyr a couple of years ago. It was OK, though I did like it's ability to take frames from video, but I know they have been upgrading things pretty consistently.
  4. What Do you mean by "Map Out"? Most generic cad programs have issues with large point clouds and so you need to find a program that is particularly designed to handle them. There are many of these and they each have differing capabilities. So part of the answer will depend on what you want to do with the point cloud. If you are modeling pipes and small detailed infrastructure, you want one that specializes in that. If what you want is to be able to run contours and do some simple structure outlines, then there are many that can handle this. What kinds of features are you trying to e
  5. Does anyone have any experience with using a Hyperspectral or Multispectral camera with a P4P (or other UAV) for mapping SAVs? How about lake/freshwater plants in general for use by a biologist to identify species and map locations? Or just ideas or notes in general?
  6. First, I would say that time will tell with the P4-RTK. Let's see how it works in the real world and how various mapping scenarios effect it's performance. It is an advancement for the P4P in that DJI has provided a built in solution to the problem of timing the GPS data precisely to the picture. Most cameras have a hot shoe for the flash attachment that can be used to time the data, but no such thing is on the P4P, and that timing is critical and is also the focus of 3rd party RTK adapters for the P4P. The new P4-RTK does not change any of the previously noted differences between RTK and
  7. I was not aware that Aerotas did processing? What do they charge? how many photos? What kind of reports and deliverables? Can you do Nadir and Oblique in the same run? To me, that last is critical. Do yourself a favor and get a trial of P3dT and try it out. We are total Carlson, but even they told me probably not for what I wanted. I do have Carlson Point Cloud on top of Survey. I also do scanning and so use that for registering different clouds, but mainly so I can draft on the cloud and send it straight into my drawing. In the end, I went with Pix4D desktop. I will just go monthly ($350
  8. Great answer by Av8Chuck. My thoughts were pretty much the same in that it really depends on the size of the project and the desired accuracy. The Z axis is always the hardest to get consistent, repeatable measurements of, so knowing all the inherent limitations is very important. The thing with the GCP(s) is that it is more than an anchor for the Z measurement. They also are crucial in ensuring that warping of the image it kept to a minimum. So to me it seems like you will definitely need more than just the one GCP or you won't really be able to compare flight to flight.
  9. Thanks Dave, I have to get more into both those apps as they are not as straight forward as some others and I didn't see right off where to do some of that. I see with DD that you have to add apps. I'm very happy to have more oblique options!
  10. What are you using for your capture platform? IOS or Android? I have not had a problem using P4D capture on my IPad (though the other day it refused to upload the mission with my DJI P4P). I have several capture apps installed. Maps Made Easy, Drone Deploy, DatuflyPro and DJI GS Pro. Many people really like Litchi which I am going to try out soon. My main gripe about most of them is you cannot control the gimble. P4DCapture and for the some applications, GS Pro allow this (as I am told Litchi does as well), and only P4D has crosshatch grids which are nice for getting better detail.
  11. Kind of off topic, but have you used P4D and Photoscan Pro (PSP) much so far for other projects? I have an older version of PSP and it has issues because it uses International foot instead of US Survey foot. I thought I had a fix for that, but my clouds keep coming in in off a few feet and have to be registered. It's easy to see, I just import the control points back into the dense point cloud and see if the match the GCP's. This happens even though I state the projection as NAD83 US WASouth survey foot. I hope that is fixed, because I do really like how well the clouds turn out. I
  12. Kermange, I'd have to wrap my head around this for a bit, but initially it seems like it should be somewhat straightforward. The "pit" as it were, is simply an upside down pile, so processing it should be no different than doing standard pile volumes. Maybe the software is having a problem with the "negative" direction, much like some older surveying software I had would go sideways if the coordinate values were negative. Gary
  13. The problem here is that it seems you may have things a bit backwards. Also, without knowing how you controlled both data sets, it is almost impossible to give you a reliable answer. The first step should have been to ensure both sets of data are on the same system. You would need known points in both sets in order to do this. Using GPS derived points makes this easier, but for volumes it would not be necessary. GCP's are relatively easy to use in Photoscan Pro, but you need to know where they are, at least in relationship with each other, to be of any use. It may be easier to use the d
  14. There may be others, but I no Datumate says their flight planner can do this. I have not used it but I believe they have a video that goes through the process. If you figure something out, please let me know.
  15. I agree with @R Martin, but would add Photoscan Pro as an option as I personally liked the software better than Pix4D and actually think it has a much easier learning curve.
  16. I too am about to purchase a drone to get my survey/mapping/aerial imagery business up and running. I am a licensed Land Surveyor (LS) in Western Washington and am looking forward to making the leap. Prior to being an LS, I was a licensed pilot and the UAV Coach Part 107 school to review for the exam and passed with flying colors within 2 days of the test being made available. After spending quite a long time researching at various models, including custom and self built, and taking the UAV Coach course on mapping, I have settled on the DJI Phantom 4 Pro. I likely will not do the plus as
  17. I think one thing being missed here is what does the law say. I know it differs in each state, but here in Wa the practice of Land Surveying is only allowed by a licensed individual and is defined as: RCW 18.43.020 Definitions....(9) "Practice of land surveying" means assuming responsible charge of the surveying of land for the establishment of corners, lines, boundaries, and monuments, the laying out and subdivision of land, the defining and locating of corners, lines, boundaries, and monuments of land after they have been established, the survey of land areas for