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  1. DanWeston

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    How does everyone determine altitude and spacing for surveys. I've done a couple now but it's been a bit of 'finger in the air' estimation when setting these parameters. Happy with the results but I'd be far more comfortable coming up with a way of setting them a bit more methodically.

    For example, for a decent resolution and overlap for flying at 50m, what spacing would you use compared to that say at 30m for the same overlap?

    The other thing I've been doing which seems to make a decent difference is checking the 're-fly at 90 degree offset' box but, when undertaking the flight, tilting the camera to 45 degrees to capture the side of buildings and structures. Does anyone else do this?... Is it the 'done' thing?
     
  2. Wingman

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    I have not done any surveys yet so my reply will be from just from exploring this option. When you set up your survey it tells you at the bottom what will be ground resolution at the height you set in your survey. The number for the ground resolution can be seen as a text on the right hand side in your survey setting dialogue. It will say something like X cm per pixel. Since you know the resolution of your camera you can figure out what kind of space on a ground your pictures cover. As an example if the camera resolution is 5000x4000 pixel and you are getting a ground resolution of 1cm per pixel then your camera takes a snapshot of 5000x4000 cm or 50 x 40 meters space on the ground.

    As for the spacing between survey flight paths I think DataPilot does it automatically based on your set altitude and an area on the ground that you want to survey. I believe that camera resolution settings are also taken into an account but it looks like it just takes it from your camera settings as there is no such a parameter in Survey settings.

    And for the camera angle, it is just what we have been talking about for the last 1-2 months here. There are no such settings into Survey mode, It just flies 90 degrees angle by default.

    I have H520 only for a couple of months and it has come with 1.3 version from a box but a lot of people say it was there before but disappeared from settings with 1.3 update. You can control a camera angle in waypoint mode only.

    I hope Yuneec has not done removing a camera angle from survey mode intentionally and they will put it back. If you need it now try Pix4D capture app. It may be possible to do it through this app. It is free so it is worth a try. UGCS app is another option but it is not free,
     
  3. Graham

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    In general, the lower altitude the better. Commercially, I understand 3cm/pix is normal, but the H520 is capable of much more. I am still using the 70% overlap as it seems to work well. Nadir is good for 2d surveys, but if 3D is wanted, a camera angle of 45 degrees is appropriate.
    At present, DataPilot surveys are nadir, but the camera angle can be changed by inserting a waypoint before the survey. The camera will then retain this angle throughout the survey. They could have made this easier.
    As Wingman correctly points out, obliques were previously part of the DataPilot firmware, but now we have a workaround.
    The E90 camera is excellent for surveys since the option to remove distortion appeared in the camera menu and I have not found that reflying nadirs at 90 degrees offers any significant improvement.
    Pix4D is claimed to be capable of handing photos taken at any angle, but I have only used 90 and 45 degrees. Other firmware may differ.
     
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  4. DanWeston

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    Thanks for the comments guys. Haven't had chance to look into them properly yet but definitely will - just wanted to pop in to say thanks... I'll let you know how I get on!
     
  5. emilereynolds

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    Hi, is the UGCS app fully supported by Yuneec 520 and is it superior to DataPilot?
     
  6. Edb

    Edb

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    Is that correct? If you insert a waypoint with a camera angle of 45 degrees before the survey grid, the 45 degree angle will be retained. I understood that any survey grid would default to nadir? This would be great and a simple workaround.
     
  7. arruntus

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    It is indeed correct and unfortunately because you could easily determine in the survey setup the camera tilt previously :cool:
     
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  8. Graham

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    It has worked for me several times. I prefer DataPilot to the PIX4D app which I find difficult to read due to the colours of the text and small buttons that don't suit my large fingers. Keep the waypoint dodge quiet or Yuneec might remove it at the next update.;)
     
    Edb likes this.
  9. Peggy

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    I was an early adopter of the 520 one of the first to get it in the UK.
    I still have the 1.19 datapilot app for the iMac (unfortunately not for PC as I don’t have one) and use that to program surveys and change the camera angles instead of the waypoint method. I then save this as a plan and upload as normal to st16s
    If anyone wants this version let me know.
    The angles settings disappeared from 1.2.5 onwards
     
  10. emilereynolds

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    Hi Graham, On Monday 18th I'm heading to Yuneec in Romford for a H520 demo. I do have some scepticism & questions for them, I did have a phone conversation with them today and they are adamant that new upgrades are on the way for the H520 within months!! Hmmm anyway, as I am very new to drones can you give me a bit of a steer on the kind of information I need to draw out of them and the kind of questions, using your experience, I need to be asking? you help on this is greatly appreciated my email is [email protected]