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Capture app stops capturing images but continued on flight path? Why?

Hi,

I used the pix4d capture app with my P3S yesterday with a grid size of about 500m x 150 (50m elevation and 3 grid lines). My drone flew along the first line and was capturing images until about 50m from the end of the first grid line. The strange thing was that the drone continued to fly along the path (I.e. Still thought the mission was going). My app had gone back to the set up a new mission screen with my previous grid shown and the option to ‘start’ the same mission again. I could still see the drone icon moving along my original grid.

During the flight I was switching to camera view in Pix4d and the app was taking photos before it stopped, but afterwards the camera image was stuck on the last one that was taken.

Can you help? Bit annoying as I travelled all the way there as a one off to do the mission! It starting getting too windy after that! I have a feeling it stopped because of the grid size or range issue? When I tried to restart the same mission the app was telling me the drone was too far away from the grid and that the grid was too large.

Thanks

Matt

Hi Pix4d support. Do you have an ideas to solve my problem I am having?

Thanks

Hi Matt,

We are sorry to hear about this experience.

The drone stops when it runs short of battery and/or looses the connection. This depends on the settings defined in DJI GO for the Fail-safe option. Normally our app shows a pop-up when the battery reaches 20% and the remote controller emits a sound.

Size of the flight

Regarding the maximum area that can be covered in one single mission, the limiting factors are:

  • Altitude and overlap (the higher the less overlap required, meaning fewer lines in the grid, and vice versa).
  • Size of the grid (length of the flight track).

Actually the color of the grid refers to the estimated flight time that is calculated given the factors above assuming the battery is fully charged at the beginning of the mission. Note that it does not take into account the battery that is necessary to fly to the first way point of the grid and to come back. The color indicates a recommendation for flying safely with the app. However it is possible to bypass this limitation:

  • In the Android app, it is possible to fly a yellow or orange mission if the advanced mode is activated (Home screen > Settings > section Advanced > check Enable advanced mode). The Android app is more optimized to fly large areas. You can find details about the best practice here: How to fly large areas: https://support.pix4d.com/hc/en-us/articles/211826243
  • In the iOS app, even if the color is yellow or orange it is still possible to fly the mission.

Distance to the grid

The maximum distance from the center of the grid to the home point is set to 150 m on both Android and iOS. The home point is actually where the drone is turned on and acquired the GPS signal the first time. This distance is mainly for security reasons, to prevent an accidental launch of a mission when the grid is too far away and it is also limited to prevent connectivity losses. However, this can be discarded:

  • Android: Activate the Advanced mode like above.
  • iOS: Home screen > Grid / Double Grid / Circular Mission > Settings > tab Advanced > set the option Ignore home point to Yes.

Besides the home point distance limitation, there is also a safety lock that prevents the drone from starting if its current location is further than 250 m away from the center of the grid. The current location is either on the ground or in the air hovering (e.g. the drone starts a second mission right after the first without coming back to the user). To bypass this limitation, the user has to take off manually and fly the drone closer to the grid before tapping the green button to initiate the flight (in the takeoff checklist).

Hope this helps to better understand the situation.
Please let us know ho it goes next time.

Regards,