Height reference in back to back missions

Julian Perry
I would like to know what counts as the ‘Take Off Location’ in the following situation. Sometimes, when I’m running two missions back to back without landing the drone first, I stop the RTH at the end of the first mission, load the second mission and start it from the hovering position where I ended the RTH. Now in cases where the second mission is using AGL and a specified take off zone, I would expect the drone to require starting the new mission from the planned start so it has the correct height information. In that case probably the second mission would fail to start. But in cases where the start is a regular ‘Take Off Location’, then I can initiate it anywhere and the drone will fly to the planned start position, so what counts as the height reference for the waypoints coming up? Is it the height the drone is hovering at after stopping RTH or something else? If the hover height is taken as the start location and height of the second mission, then all the planned waypoint heights will be raised up by the new start hover height. I would appreciate some clarity on this. Thanks.
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Comments

4 comments

Date Votes
  • Comment author
    Jim McAndrew Dronelink Staff

    The height is always above the actual takeoff location.

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  • Comment author
    Julian Perry

    So the actual take off height of the first mission is carried over as the actual take off height of the second mission. I can see that will work fine where the two start points have a similar actual height but is it fair to say that if, due to the terrain, those two start points have very different heights, then one could fly into the ground?

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  • Comment author
    Jim McAndrew Dronelink Staff

    If you have concerns about the altitude reference, you need to set a required takeoff locaiton for each plan, and the app will force you to come land and takeoff at the right place to ensure altitude consistency.

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  • Comment author
    Julian Perry

    Yes I understand. I needed to be sure of when I can run two missions without landing in between. It seems that is fine so long as the two take off locations are reasonably similar in height.

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