Auto-Refly Recorded Manual Flights

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Jeannine
Posts: 44
Joined: Tue Apr 10, 2018 5:35 pm

Auto-Refly Recorded Manual Flights

Post by Jeannine » Fri Apr 20, 2018 9:38 am

In order to automatically refly a manual flight, you first have to record a manual flight. Using the mission creation button (bottom right, green +) chose "REC by flying":

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Note that you can also start recording your flight while your drone is already in the air. Once you are done with recording your flight tap on the stop recording button (bottom right). Your recorded flight will appear and is accessible through the flight icon at the top just below the status information bar. Here is how a recorded flight looks like:

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When you press on the magic wand icon on the left you will be presented with three options. Chose one of the options and a new flight plan will appear as a new icon on the right. This new flight plan you can now automatically refly like any other flight plan:

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1. Plan Using Trajectory: Creates a mirror of the recorded flight by placing new WPs along the recorded flight trajectory. Your recorded WPs (Photos) are part of the new flight plan. For the example above this will look as follows:

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2. Plan Using Photos: Connects your recorded WPs (Photos) with straight lines nothing more. Your recorded WPs (Photos) are part of the new flight plan. For the example above this will look as follows:

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3. Smooth Plan Using Photos:
Creates a smooth flight plan through the recorded WPs (Photos). Your recorded WPs (Photos) are part of the new flight plan. For the example above this will look as follows:

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Pete
Posts: 1
Joined: Wed Jun 27, 2018 9:58 am

Re: Auto-Refly Recorded Manual Flights

Post by Pete » Wed Jun 27, 2018 10:11 am

How save is it to fly close to objects while recording waypoints. I assume you log just the GPS coordinates and the actual position can be off a few meters when later flying the mission. In your tutorial video about manual recording you are flying close to a tree before you head towards the lake.

What is the best strategy to prevent obstacles in the direct path between recorded waypoints? Recording additional waypoints around the obstacle, drawing shapes around the obstacles on the map after the recording before generating the flightplan or choosing the trajectory plan, as this seems to build upon the real path the drone took while recording? Is that the reason for the trajectory plan? Initially was puzzled what it shall be good for.

Martin
Posts: 216
Joined: Wed Mar 28, 2018 4:47 pm

Re: Auto-Refly Recorded Manual Flights

Post by Martin » Wed Jun 27, 2018 4:35 pm

Pete wrote:
Wed Jun 27, 2018 10:11 am
How save is it to fly close to objects while recording waypoints. I assume you log just the GPS coordinates and the actual position can be off a few meters when later flying the mission. In your tutorial video about manual recording you are flying close to a tree before you head towards the lake.
You are correct that reflying a mission based on previously recorded GPS coordinates suffers from GPS inaccuracies. There are two more aspects to consider:
  1. DJI overshooting waypoints with high speeds for automated missions: DJI does tend to overshoot corner waypoints at high mission speeds. The rule here is, that the higher the mission speed the bigger the overshoot distance can be.
  2. Drone Harmony waypoint smoothing when converting the flight to a trajectory: If you chose to smoothen the plan the new flight plan trajectory differs from what you have been flying manually.
So if you want to re-fly automatically a recorded manual flight close to obstacles I recommend you to do the following:
  1. Consider to not smoothing the plan if you want to use the exact same trajectory ("Plan Using Trajectory").
  2. Fly the mission first at a very low speed to make sure you are far enough from obstacle. Also be ready to take over control of the drone with switching the flight mode on your remote controller. Only go to higher speeds, if you are confident that overshoots at waypoints will not hit any obstacle.
Pete wrote:
Wed Jun 27, 2018 10:11 am
What is the best strategy to prevent obstacles in the direct path between recorded waypoints? Recording additional waypoints around the obstacle, drawing shapes around the obstacles on the map after the recording before generating the flightplan or choosing the trajectory plan
Recording additional waypoints would definitely help. Unfortunately the flight plan smoothing algorithm does not yet take into account any shapes that you draw on the map, this is a feature we can and should add.
Pete wrote:
Wed Jun 27, 2018 10:11 am
, as this seems to build upon the real path the drone took while recording? Is that the reason for the trajectory plan? Initially was puzzled what it shall be good for.
The reason for flight plan smoothing is that it allows you to record a smooth video that goes through key locations / camera frames without having sharp, manual camera movements in between. You record first some key frames manually without worrying during transitions on how the gimbal camera etc. moves. Afterwards the automated re-flying of the newly created smooth mission will do these transitions in a smooth way. But to be fair, this functionality was not (yet) designed to fly very close around obstacles.

I hope these clarifications will help you. Happy flying!

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