liftoff and landing waypoints

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jprn
Posts: 10
Joined: Sun Jun 03, 2018 11:42 am
Location: France Pyrenées

liftoff and landing waypoints

Post by jprn » Tue Jun 05, 2018 1:58 pm

Hello

I saw in v0.2 release notes :
Functionality During Flight : It is now possible to choose an action in the end of the execution of a flight plan by selecting from the following:
- Hover over landing (green) point: The drone hovers above the landing waypoint (the green point) of the plan.
- Land at landing (green) point: The drone lands automatically at the landing waypoint (the green point) of the plan.
- Return + land at home (launch) point: After reaching the landing waypoint (the green point), the drone executes a RTH command (Return To Home), flying to the point where the drone took off. Then the drone lands automatically.

On v0.8.3 I don't see anything like.

Depending on the mode you choose (pro, shapes, quick, manual) you don't get the same action on the red arrow or the green point... Some mode let you choose RTH, other leave the drone hover on last waypoint, one has red arrow and no green point, and so on... It's particularly tricky and needs you test all the possibilities to understand what will happen.

I would like to find something simple when planning : wathever is the mode, one red arrow and one green point. 2 possibilities when selecting red arrow waypoint : liftoff or liftoff & landing. 3 possibilities when selecting the green point : hover, land, or return+land at home.
In other words I would like, whatever is the mode, choose when planning the point where the drone takes off, and what it does a the end of the flight (hover or land at green point, or return+land at home point).

Seems possible ?
Think like a pilot : simple is best and less is more !

Please apologize for my poor english.

Martin
Posts: 199
Joined: Wed Mar 28, 2018 4:47 pm

Re: liftoff and landing waypoints

Post by Martin » Tue Jun 05, 2018 5:31 pm

Hi jprn,

In the most recent version this is how it works:
  1. The liftoff point (red arrow) is only used at the planning stage. All altitudes are relative to the altitude of your planned liftoff location.
  2. The landing point (green dot) is used at the planning stage but also for automated landing.
  3. The mission end action behavior (auto land or hover) is something you can chose now during the launch dialog (with the exception of quick launch missions, as they are intended for quickly executing while the drone is already in the air).
  4. On site the drone will not take off where you initially planned the liftoff point (so not your red arrow location) but rather where your setup your drone. This "real" liftoff point is indicated by a H (and commonly referred to by Home location). During flight execution the waypoint altitudes are all interpreted relative to your home location.
Hope this clarifies the behavior a bit.

Best regards,
Martin

Tkaiser
Posts: 1
Joined: Tue Sep 11, 2018 1:28 pm

Re: liftoff and landing waypoints

Post by Tkaiser » Mon Oct 08, 2018 10:50 am

Dear all,

i do have another Question concerning liftoff and Landing waypoints. I noticed that drone harmony does (i tested the example of a top down Mission) not accept a waypoint for liftoff and landing that is set further away from the Mission polygon than some meters. While planning a mission i set the liftoff waypoint very close to the polygon and then in the field tested whether the app would allow me to start from further away - but the drone simply does not take off.

Is there a way to detour this? I would prefer to be able to choose freely from where my drone takes off (even a kilometer away), for example when the terrain (for example no roads, forest) does not allow for the drone starting next to the polygon.

Is there a specific reason for this constraint?

Thanks and many greetings,
Thomas

Bushie
Posts: 4
Joined: Sun Aug 26, 2018 6:50 am

Re: liftoff and landing waypoints

Post by Bushie » Thu Oct 18, 2018 1:42 pm

I have exactly this problem. I wish to plan a flight videoing an island, but taking off from the adjacent shore. The island is some 300m off shore. Travelling to the island is not an option.

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AttilaFarkaš
Posts: 16
Joined: Tue May 28, 2019 4:37 am

Re: liftoff and landing waypoints

Post by AttilaFarkaš » Tue May 28, 2019 6:37 am

So do i understand it correctly - one isn't obliged to takeoff from the exact liftoff poin, but must be nearby...?

And what about launching the mission in midflight?

Just take off manually, fly near to the planned scene, load the flight mission plan while howering there and launch - will this work?

Thx

Martin
Posts: 199
Joined: Wed Mar 28, 2018 4:47 pm

Re: liftoff and landing waypoints

Post by Martin » Wed May 29, 2019 5:32 pm

AttilaFarkaš wrote:
Tue May 28, 2019 6:37 am
So do i understand it correctly - one isn't obliged to takeoff from the exact liftoff poin, but must be nearby...?

And what about launching the mission in midflight?

Just take off manually, fly near to the planned scene, load the flight mission plan while howering there and launch - will this work?

Thx
Apologies for my late reply in this thread missed this question!
  1. DJI imposes a maximal distance between waypoints and some other limits on distances for missions that Drone Harmony also has to adhere to. This is from their documentation:
    The waypoint distance is too long. A valid distance between two adjacent waypoints is less than 2km and greater than 0.5m. In addition, the first and last waypoint of the mission must also have a separation of less than 2km and greater than 0.5m. If the separation of any consecutive waypoints or the separation of the first and last waypoint is larger than 2km, then this error will be raised.
  2. We impose some additional limits for the liftoff / landing locations so far, as we thought it is wise not to have landing points far away from the actual mission in terms of display in the User Interface (map bounding box etc.). After your feedback, we might have to revisit this decision.
  3. You can start a mission while the drone is already in the air (for those who do not know how to lift off manually, refer to the DJI manual on how to do this - usually its pulling both sticks down and towards the middle).

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AttilaFarkaš
Posts: 16
Joined: Tue May 28, 2019 4:37 am

Re: liftoff and landing waypoints

Post by AttilaFarkaš » Thu May 30, 2019 1:30 am

Martin wrote:
Wed May 29, 2019 5:32 pm
[*]We impose some additional limits for the liftoff / landing locations so far, as we thought it is wise not to have landing points far away from the actual mission in terms of display in the User Interface (map bounding box etc.). After your feedback, we might have to revisit this decision.
Thanks for the reply...
Well, i never seen takeoff/landing points before in mission planing and i have seen quite loads of apps. Even DJI native apps handle missions without it.
Finally, while planing at home, one can never be sure of the exact point of takeoff and landing. I think it can be just dropped - i see no real reason to handle it.

Maybe a takeoff /land button would be much more handy in the interface (for those who are unable to takeoff manually)

Martin
Posts: 199
Joined: Wed Mar 28, 2018 4:47 pm

Re: liftoff and landing waypoints

Post by Martin » Thu May 30, 2019 7:58 am

AttilaFarkaš wrote:
Thu May 30, 2019 1:30 am
Martin wrote:
Wed May 29, 2019 5:32 pm
[*]We impose some additional limits for the liftoff / landing locations so far, as we thought it is wise not to have landing points far away from the actual mission in terms of display in the User Interface (map bounding box etc.). After your feedback, we might have to revisit this decision.
Thanks for the reply...
Well, i never seen takeoff/landing points before in mission planing and i have seen quite loads of apps. Even DJI native apps handle missions without it.
Finally, while planing at home, one can never be sure of the exact point of takeoff and landing. I think it can be just dropped - i see no real reason to handle it.

Maybe a takeoff /land button would be much more handy in the interface (for those who are unable to takeoff manually)
The liftoff location is required for planning the flight in our planning algorithms and displaying to the user what will happen if he will start from a certain location. Other apps do not include obstacle avoidance computations in their planning algorithms. In addition, all the altitudes are relative to the absolute altitude of the lift off location. If when on site, you decide on another liftoff location, it is handy to still know where you originally planned to liftoff from, so that you know the difference in altitude and can adjust your plans accordingly.

So what we will do, is to revisit our limitations in how far off you can set the planned liftoff / landing location. Maybe we can increase those.

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AttilaFarkaš
Posts: 16
Joined: Tue May 28, 2019 4:37 am

Re: liftoff and landing waypoints

Post by AttilaFarkaš » Thu May 30, 2019 10:27 pm

Martin wrote:
Thu May 30, 2019 7:58 am
The liftoff location is required for planning the flight in our planning algorithms and displaying to the user what will happen if he will start from a certain location. Other apps do not include obstacle avoidance computations in their planning algorithms. In addition, all the altitudes are relative to the absolute altitude of the lift off location. If when on site, you decide on another liftoff location, it is handy to still know where you originally planned to liftoff from, so that you know the difference in altitude and can adjust your plans accordingly.

So what we will do, is to revisit our limitations in how far off you can set the planned liftoff / landing location. Maybe we can increase those.
Thanks.
Im going to test tomorrow. If i understood correctly, the liftoff points are only orientational - that means they serve to visualise the plan in first place and the drone will actually set the zero altitude from its REAL takeoff and return to its REAL takeoff as "HOME" ... i also hope it will not - once the mission is launched - head first to the liftoff point.
Really need some testing.

One more note on margo - maybe the RTH as well as the way to the first waypoint should be handled in the RTH altitude set in drone settings and not as visualised on the plan (in example if the last waypoint is in altitude 100 meters then according to the plan the drone descents fom 100 to 0 on the way in kind of / ) hope you got what i mean. (i am not mean) :)
needs testing

Martin
Posts: 199
Joined: Wed Mar 28, 2018 4:47 pm

Re: liftoff and landing waypoints

Post by Martin » Mon Jun 03, 2019 1:26 pm

AttilaFarkaš wrote:
Thu May 30, 2019 10:27 pm
Martin wrote:
Thu May 30, 2019 7:58 am
The liftoff location is required for planning the flight in our planning algorithms and displaying to the user what will happen if he will start from a certain location. Other apps do not include obstacle avoidance computations in their planning algorithms. In addition, all the altitudes are relative to the absolute altitude of the lift off location. If when on site, you decide on another liftoff location, it is handy to still know where you originally planned to liftoff from, so that you know the difference in altitude and can adjust your plans accordingly.

So what we will do, is to revisit our limitations in how far off you can set the planned liftoff / landing location. Maybe we can increase those.
Thanks.
Im going to test tomorrow. If i understood correctly, the liftoff points are only orientational - that means they serve to visualise the plan in first place and the drone will actually set the zero altitude from its REAL takeoff and return to its REAL takeoff as "HOME" ... i also hope it will not - once the mission is launched - head first to the liftoff point.
Really need some testing.
Yes, that is correct.
AttilaFarkaš wrote:
Thu May 30, 2019 10:27 pm

One more note on margo - maybe the RTH as well as the way to the first waypoint should be handled in the RTH altitude set in drone settings and not as visualised on the plan (in example if the last waypoint is in altitude 100 meters then according to the plan the drone descents fom 100 to 0 on the way in kind of / ) hope you got what i mean. (i am not mean) :)
needs testing
The RTH functionality is something different to the "planned landing end of mission action". The user has the choice to select during the launch of the mission his choice of mission end action (hoover or land at the mission end point). Return to home is a DJI provided routine that can be initiated by different triggers (examples include low battery, user-initiated RTH action, etc.). RTH will issue the drone to fly towards home (the take-off location, unless the user changes that location (which is not possible inside of Drone Harmony at the moment)) at the altitude of the set RTH altitude. On the other hand, the Drone Harmony mission end action "landing" will land the drone at the end of the mission location.

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