Recent content by Bigriver

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    What deliverables are you giving your client?

    Funny that you mention that. I just spoke with Lizardtech earlier today, after downloading and testing the software a couple weeks ago. I expressed to them that the cost (about $3000) would prohibit me from buying a license at this time. That license also had a limit of like 100 GB processed...
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    P4A/P or Mavic 2 Pro for photogrammetry?

    Dumb question here... but why in the world wouldn't DJI (chinese) utilize the Beidou constellation (also chinese)?
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    Thoughts on the Phantom 4 RTK

    I need to check out the GSR app before writing it off completely, but it looked like a pretty basic grid mission planner. One problem of several mission planning apps is that the aircraft stops at each turn. Using Litchi, I am able to round off each turn and never change the speed of the...
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    Thoughts on the Phantom 4 RTK

    Dave - As an engineer and surveyor, you won't catch me picking sides in that fight. But I have experienced much of the same here. Like you were considering, to prove your accuracy to the surveyor, see if you can fly a project they have already ground surveyed. Georeference it with...
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    Mid-day Cloudburst in Arizona

    Great decision to stop, because you got a really fantastic shot. [emoji106]
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    RTKLIB with P4RTK

    So when DJI says that the camera on the RTK model is "better calibrated" (or something like that), is that sales hype or does it really produce better mapping? As for point cloud accuracy, i suppose my question is, if you have a better geolocation of the drone when it captures the image, does...
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    survey and mapping.?

    There are quite a few, free apps out there for mission planning, and flying grid patterns. Pix4D Capture, MapsPilot (mapsmadeeasy), Ugcs, DroneDeploy just to name a couple. They are usually very easy to learn. Each has its pros and cons. But shouldn't need to "freehand" it, unless there are...
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    RTKLIB with P4RTK

    I am still wondering if the quality of the point cloud and resulting orthomosaic produced by the Phantom 4 RTK unit is any better than the Phantom 4 Pro. Has anyone compared the two?
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    P4A/P or Mavic 2 Pro for photogrammetry?

    The other thing that worries me is how soon the mission planning apps (or even DJI Go4) will stop supporting the P4P. We are really at their mercy. I'd like to have an alternate plan just in case.
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    P4A/P or Mavic 2 Pro for photogrammetry?

    Good question. I have wondered the same. I often fly larger projects at rather high speeds with good results using the mechanical shutter. However I haven't tested those results against results using rolling shutter. May be time for some test runs. In the meantime, I will be taking great...
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    RTKLIB with P4RTK

    Do you P4RTK users see any improvement in the quality of the point cloud and resulting orthomosaic over what is produced by just a P4P? Not from a georeferncing accuracy standpoint, but from an increase in quality (like less variations in point elevation differences, less noise, etc.). I...
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    RTKLIB with P4RTK

    Great discussion. I haven't quite decided to make the leap to RTK/PPK, but there are definitely pros and cons, and you guys bring up many good points to consider. @amicron - You mentioned that you had been doing "several things wrong" in your processing workflow. Could you elaborate on which...
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    Finding water with the Phantom 4?

    It usually has no "warp"ing effect. You have the choice to replace an area with a single image, or a number of user selected images for an orthomosaic. On roadways, I use it to remove overhanging trees and vehicles. If you select an image too far away, the resulting ortho may look strange, but...
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    Finding water with the Phantom 4?

    I can only speak from having used Pix4D, but when I have overhanging trees above roadways, it helps to remove the trees from the point cloud prior to creation of the orthomosaic. After the ortho is created, it can be edited in the Mosaic Editor, to use only certain images in the mosaic for...
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    Three Q's about Drone Deploy....

    Many of my projects are flown at 250' altitude, yielding 0.8 inch GSD. Larger projects i will bump it up to 400' altitude (US maximum) with 1.3 inch GSD. These are based on using P4P. This seems to be high enough resolution for my mapping. Pix4D on desktop is my mapping software with similar...